Java in Hindi

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Java in Hindi Third Edition By Prof. V.K. Sharma

2015

www.besthinditutorials.com

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Java in Hindi Third Edition V.K. SHARMA

www.besthinditutorials.com

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©Copyright 2015 by www.besthinditutorials.com This EBook may not be duplicated in any way without the express written consent of the publisher, except in the form of brief excerpts or quotations for the purpose of review. The information contained herein is for the personal use of reader and may not be incorporated in any commercial programs, other books, databases, or any kind of software without written consent of the publisher. Making copies of this EBook or any portion thereof for any purpose other than your own is violation of copyright laws.

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Limits of Liability/disclaimer of Warranty: The author and publisher have used their best efforts in preparing this EBook. www.besthinditutorials.com makes no representation or warranties with respect to the accuracy or completeness of the contents of this book, and specifically disclaims any implied warranties which extend beyond the descriptions contained in this paragraph. No warranty may be created or extended by sales representatives or written sales materials. The accuracy and completeness of the information provided herein and the opinions stated herein are not guaranteed or warranted to produce any particular results and the advice and strategies contained herein may not be suitable for every individual. www.besthinditutorials.com shall not be liable for any loss of profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages.

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Reprint Edition: 2013

Published By: www.besthinditutorials.com

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Contents 1.

2.

3.

4.

5.

6.

7.

8.

9.

INTRODUCTION TO JAVA 1.1. History of java 1.2. Features of java 1.3. OO principles of java 1.4. Java vs. c and c++ INSTALLING JAVA 2.1. Java development tools 2.2. Downloading java 2.3. Installing java and setting environment variables 2.4. Download eclipse 2.5. Installing eclipse FIRST JAVA PROGRAM 3.1. Running a java program 3.2. Hello world program DATA TYPES 4.1. What are data types? 4.2. Integer 4.3. Float 4.4. Character 4.5. Boolean VARIABLES 5.1. What are variables? 5.2. Types of variables 5.3. Creating variables STRINGS 6.1. What are strings? 6.2. Operations on strings ARRAYS 7.1. What are arrays? 7.2. Creating an array 7.3. Initializing an array 7.4. Displaying an array OPERATORS 8.1. What are operators? 8.2. Types of operators Control Statements 9.1. What are control statements? 9.2. Types of control statements

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10. CLASSES 10.1. What are classes? 10.2. Advantages of classes 10.3. Creating a class 11. OBJECTS 11.1. What are Objects 11.2. Steps to create an object 12. CONSTRUCTORS 12.1. What are constructors? 12.2. Rules for creating constructors 12.3. Types of constructors 13. METHODS 13.1. What are methods? 13.2. Structure of method definition and method call 14. INHERITANCE 14.1. What is inheritance? 14.2. Types of inheritance 14.3. Inheriting a class 14.4. Example 15. Exception Handling 15.1. What are exceptions? 15.2. Keywords(try, throw, catch) 15.3. Example 16. Interfaces and packages 16.1. What are interfaces? 16.2. Example 16.3. What are packages? 16.4. Creating a package 16.5. Using a package 16.6. Some common java packages 17. Multithreading 17.1. What is multithreading? 17.2. Thread class 17.3. Runnable interface 17.4. Synchronization 18. File I/O 18.1. What are streams? 18.2. Byte streams 18.3. Character streams 19. Serialization 19.1. What is serialization?

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20.

21.

22.

23.

24.

25.

26.

27.

19.2. Serializable interface Collections Framework 20.1. Collection interface 20.2. Other interfaces Lambda Expressions 21.1. What is functional interface? 21.2. What is lambda expression? Generics 22.1. What are generics? 22.2. Generic classes 22.3. Generic methods Applets 23.1. What are applets? 23.2. Applets life cycle methods 23.3. Example AWT(Abstract Windows Toolkit) 24.1. What is AWT? 24.2. Container classes 24.3. Component classes 24.4. Frame class Servlets 25.1. Architecture of servlets 25.2. Life cycle of servlets 25.3. Example Swing 26.1. What is swing? 26.2. Features of swing 26.3. Swing classes 26.4. Example Index

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Preface The idea of writing a book about Java Development in Hindi can be somewhat futile at times, considering the pace at which Java continues to expand, morph and change. What started out as a book project two years ago has now become a series of updates to the original work with the page count nearly double the original project and that after making hard decisions about what to leave out of the book to make sure it gets liked. This update to Java in Hindi represents our latest effort to provide coverage on important Java Development topics, namely the expansion into the Swing. Like many things in life, the only constant is change, but by now we are somewhat accustomed to the rapid-fire environment of Java Development. To the end, we have ensured that all the programs work with eclipse as well as without eclipse. The third edition is written by Vipin Kumar Sharma. Thank you for learning and collaborating with us.

VIPIN KUMAR SHARMA

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Acknowledgement Writing a third edition of Java in Hindi feels somewhat like the old saying about weddings: “Something old, something new…” The deadline for the third edition did not become any easier as at last count there are still only 24 hours in the day. And as for something new it seems as though Java‟s pace of innovation is continuing to match its adoption rate by users around the globe.

In particular, we‟d like to acknowledge and thank everyone at www.besthinditutorials.com. Firstly I would like to thank our EBook Designers and editors, who have been involved in every aspect of now three editions of this project. I would also like to thank our publisher to bring this masterpiece in EBook format.

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About this book Java in Hindi, Third Edition is a revision and update of the second edition published in 2013. This third edition adds new content related to java 8. Like its predecessors, this book covers important beginner topics such as “What is Java?” and installing and using the development environment. We than advance to practical working examples of core programming topics any developer will be happy to have at the ready on the reference shelf. The remaining chapter‟s present detailed example applications covering advanced topics, including AWT and Swing. Although you can read the book from start to finish, you can also consider it a few books in one. If you are new to Java focus first on beginning chapters. With the foundation you can work your way up to last chapter.

Who should read this book? We wrote this book for professional programmers and hobbyists alike. Many of the concepts can absorbed without specific Java language knowledge. If you have c, c++ or c# knowledge, you will be able to follow the examples. Prior eclipse experience is helpful, but not required. A number of good resources are available on java and eclipse to augment the content of this book. And lastly the person who is willing to learn java in his mother tongue Hindi should read this book.

Road map 1. Basic – first 10 chapters contain basic information regarding java programming. 2. Intermediate – next 10 chapters are somewhat of intermediate level and necessary java topics. 3. Advanced – remaining chapters covers some advanced topics of java language.

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Chapter 1 Introduction This chapter covers    

History of Java Features of Java OO Principles Java vs. c and c++

History of Java Java एक general purpose object oriented

. Sun Microsystems

. Java क क

U.S develop क

. Java क

Java James Gosling Java क एक

क क

oak

क

ए

क क java क

develop क

औ

क java platform independent

क

क execute क

क

java 1991

क

ए

ए

. Java

. Java क

क java क

.

क

java क

.

Features of Java java क क ए

क

क

क

क

. एक

java

.

क java

क

ए.

1. Compiled and Interpreted compiled approaches क combine क compile क क क

.

interpreted

औ एक two

क

generate क

क

क

क क

.

. क क

instructions generate क

क

java .

ए java

directly execute क

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क .

क

क

क

.

क

एक

क

क

.

एक क

क

ए

क

ए क

JVM

generate क

क

generate

ए

क

.

execute

JVM उ

machines क

क

क

क JVM क

.औ

क क

.

क

ए क

क . Java क

क

क compile क

java

क

JVM (java virtual machine) JVM

क

क

ए

क

क

क

क

JVM

generate क

generate

क

. .

एक

क

.

3. Object Oriented Java एक true

ए

क

. Java क

. Java

.

4. Robust and Secure Java एक robust

क java

technologies क

क crash ए क

reliable

क

क

क

क

क

. Java

क

.

JVM क

Java

environments

क

क

.

क क invalid combinations क

generate क क

JVM

.

5. Distributed Java

ए क

distributed applications

औ एक

networks क

क

. Distributed applications

क task क

applications

क

क

RMI क

. Java

.

6. Simple and Familiar Java एक

. Java क

c औ c++

ए ए

java क easy to

declarations, control statements, methods declarations understand

क variables

.

क java c औ c++ क

क c औ c++

.

ए java क

क

क

क familiar java क

क

क

.

7. Multi-threaded and interactive Java एक multi-threaded java क

औ

8. High Performance

.क

java .

एक

क

क

क

क

.

You can download this EBook from www.besthinditutorials.com Java क performance c औ c++

impressive . Java क

क

क

क

reason

क java क architecture

. क

. Java क

क

क java

.

9. Dynamic and Extensible Java एक dynamic क

. Java

औ

,

क

dynamic

.

Java क

क

क

क

java एक extensible

.

औ

क

क

क

.

10. Ease of Development develop क

Java क

क

. Java

ए

क

.

क ए

क क

क

क

क

क

. .

.

Object oriented principles of java क

java एक

ए

क क

ए

क

ए

. Java क

क

principles क

.

-

1. Encapsulation Encapsulation क data hiding औ उ

क

क

क

ए

क ए औ क

(variables) औ क

ए

. Encapsulation .

ए

क

.

क एक

क ए

क क

bind क

(Methods) एक

क .क

क

औ

. Encapsulation क

ए

क क

. Java 3

क . क

hiding

क

Public -

क

क

Private -

ए

क क

Protected -

क

ए

क क

क

क

.

क ए

क

क

.

ए

क

क

2. Inheritance क क

एक

एक

क क

ए

औ क

क .

क

क

. औ

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. Java क

क

.

क

. एक

allow क

java

क

एक

.

3. Polymorphism Polymorphism क ए

,क

"एक

क according

क ". Polymorphism क क

actions

एक

क

.

क

.

4. Abstraction Abstraction java क कक क

औ

. क

.

क

concept . same क

क

क

क

. क

.

क

क

क

क

क कक

क

क

क

क

क

क क

.

क

.

Java vs. c and c++ Java vs C एक object oriented programming language

1.

क

क

program objects

क C एक procedural language . औ C

क

क

functions

. एक interpreted औ compiled language

2.

language क क

क

directly JVM उ

convert

क 4.

क

convert क

convert क

एक high level language

3.

क C एक compiled language . C

क C एक low

क

क

. language . C language machine क

. bottom up approach

ए

क

क

क

क C top down approach क

कC

क

ए

. ए

. pointers क

5.

कC

क pointers क handle क

क

. memory क automatically

6.

कC

क

क

क

क

8. error

उ क

. C overloading क उ

error क

automatic garbage collection

.

.

overloading क support क

7.

.

क

exception handling क क

.

क क

. क C

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Java Vs C++ 1. C++ structures, unions, templates, operator overloading औ pointers क support क क

क

2. C++

क

collection

.

3.

threads क

क

ए destructors

ए built in support क

क

क

क

क

. C++

क क

.

क C++

automatic garbage

threads third party

scope resolution operator(::)

क

औ

क

resolution operators क

5. C++

goto statement

6. C++

method overloading

method overloading

.

.

default arguments

arguments

क

support

क

libraries क 4. C++

क

.

8. C++ compiled language

goto statement

operator overloading क support क औ

क

क compiled

.

क

default

. .

औ operator overloading

.

7. C++ क क

क

क

क

. क

.

platform independent

औ interpreted

.

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Chapter 2 Installing Java This chapter covers  

Java development tools Installing java and eclipse

Java Development Tools

JDK(Java Development Kit) JDK एक ए क

क

क

. JDK

ए क

क

JRE

क

क execution क

औ उ क execute ए

.

JRE(Java Runtime Environment) क execution क

JRE (Java Runtime Environment ) क

औ

ए

क

ए क

एक

क

ए

. JRE

क execute

क

ए

.

JRE क 2 क 1.

क

2.

क execution

क

JVM(Java Virtual Machine) क क

क .

क

क

क

Machine ) एक environment JRE क

क

क

.

क compile क क

convert क

क

क . JVM (Java Virtual क

convert क

.

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Installing java and eclipse Java क क

औ command prompt क क

उ

क

. एक

command prompt version

क java

.

उ क

क

2

क

क official

. क

एक

क

उ

क

औ

क

क

क

उ

क

क क

editor

क IDE

. क

environment क NetBeans IDE milega

उ

क

Eclipse

.

Java command prompt platform औ NetBeans IDE

उ

क

क

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Eclipse IDE उ क क http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/marsr

-

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Chapter 3 First Java Program This chapter covers  

Running a java program Hello world program

Running a java program क

क

क

क

क2

notepad क

क

.

औ console

console

क

IDE क use

java उ

क

क

. क

क

ए

1. Through IDE (Integrated Development Environment) 2. Through Console Through IDE IDE

क

कक

क .

IDE

कक एक IDE

उ

क

क

क

क Eclipse, NetBeans IDE Java Compiler क execute क क .

क .

औ .

क

क

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Through Console Console 1. Run

क

program cmd

क

2. Command prompt

क steps

ए ए .

औ command prompt

क

क

क

उ drive

एक

क

install

औ

क

bin folder क locate क

3. क

क क

कक औ enter

क

क

क

क

क image

क क

ए

javac

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क

4. MyProgram.java.

उ

क

क

prompt

.java extension

क javac MyProgram.java औ ए

errors executable file

ए क

क

javac command enter

क

औ

क क

क .

क क क

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5.

क

क

औ ए

क

क

java MyProgram.

Hello world program एक simple

क

क

क

क औ

क

क

copy क

औ

क

lecturer एक

board

simple

.

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notepad क

औ उ

क

क java program

chapter 2 ढ़

क

inverted commas (" ") क

एक message एक

.

औ main

HelloJava

क क

println

क क

ए क

क

क

ए description क

क

क

. क

औ

public - public एक access modifier . Access modifiers 3 protected) औ

क members क ए

क

क क

क

.

(public, private, क

.

क

tutorials एक क

class -

ए क क

important concept

static क

क

क

HelloJava keyword क

.

क

क

method क

कक क main

program क execute क

क

ए access क

एक

main -

main

क

ए क

System.out.println () command prompt screen

ए

क

.

क java run time environment

. क

क execution उ

.

.

string array command line arguments क

क execute क

क

.

. Class क

क

String args [] -

कक

argument

क

क

ए

क

.

system एक package , out एक उ

क

क

ए

.

क

, औ println एक .

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Chapter 4 Data Types This chapter covers     

What are data types? Integer Float Character Boolean

What are data types? Data, data औ data. क क

क

available क उ क

.

. क क

.

क उ

क according क

???

उ क

क

.

.क

औ क

. operations क

.

operations क

क

perform

operations क

and Division)

ए

.

(Addition, Subtraction ,Multiplication

perform क

क 4क

categories

क

क

.

-

Integer Integers क

क क

( 4क

क

क क

क

. क

) include .

क

क .

क

क

क

क उ क

क

-

Byte क

8 क

Example - int age = 40;

. -127

क 128 क क क क

क

क क

क

क क

. .

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Short क

16

.

क 32,767 क क क

-32,768

क

क

. Example - short sal = 25,000 Int Int क

32

.

commonly

क 2,147,483,747 क क

क

. Int क

-2,147,483,648

.

Example - int population = 2,00,000,000; Long क

64

क

.

क

.

Example - Long WorldPopulation = 8,00,00,00,00,00,00;

Floating-Point Numbers numbers क

.

क

( क क

क

क 2क

क

क

क क

.

क

क

) .

-

Float क क 3.4e+038 क क

क क

क

. क

32

. क

.

1.4e-045

क

एक

क

. Example - float temp=34.4; Double क क 1.8e+308 क क क

.

Example - double pi = 3.1416;

क

.

क

क

क

.

64

. क

4.9e-324 ७

क

क

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Character क क

एक

क

क

क

क char क

ए क

क

क

क

ए

क

.क

क

16

.

.

Example - char FavLang = „c‟;

Boolean ए क

क

क decision true

क

false.

Example - boolean isFivemorethanOne = “true”;

.

ए

क

2

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Chapter 5 Variables This chapter covers   

What are variables? Types of variables Creating variables

What are variables? क

information क उ

ए

क

औ उ क उ क

ए ए

ए

ए

changeable क

ए .

ए

क

.

क

उ

क

क .

क . एक

.

.

. Variable

क

क ए

क

constant क

क

ए क

ए

क

क

. क

क

क

क

क

क create क

क

क

. औ उ information क

क

ए ए

.

क

.

क

क

क

2

.

क

क उ

.

ए

क .

ए

उ क उ

क

error generate क

ए

क

क

क

ए

information क

.

change

Information क

क .

क

क

ए

क क

औ एक

क

क

क

क क

क क

क क

क

क

ए data type

क

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Types of Variables in Java

ए

Java

क उ क scope क

2

-

Local Variables क उ

क

ए

ए

क क

क ए

क

क

ए क

उ

ए उ

.

क

क

उ

ए क

उ

क

क ए

क क

.

. .

Global Variables क

variable क

क

क

उ variable क

क

ए

.

उ

क

ए

.

global variables क

.

क ए

.

क

क scope

.

Creating Variables

ए

Java

create क

क 2

stages क

.

क

क

.

Variable Declaration ए .

क

औ

क

क

क

क

-

Example - int PersonAge; Variable Initialization ए

क

क

.

-

Example - PersonAge = 24; क

एक

क

क

-

Example - int PersonAge = 24. क initialize

क क

ए declare क क

क

ए .

क

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क

ए

(System.in)

nextInt(), nextLine(),nextFloat

क

Scanner क क

क

. क

ए क क

एउ

.

Example -

int PersonAge; // variable declaration Scanner s = new Scanner(System.in); // Scanner class object PersonAge = s.nextInt(); // reading from keyboard

औ उ

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Chapter 6 Strings This chapter covers  

What are strings? Operations on strings

What are strings? characters क sequence implement क क

ए क

.

क compare क

.

. String एक

क

क

2 औ

strings क objects क

"I am fan of java". Java

क

operations .

normal variables क

क object

ए क

क

क

2

string क

.

Example

String क एक variable क क .

क

क ऊ

MyString

औ एक object क एक

क ए

क क

क उ क

क क

क क

क

"this is a string "

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क क

क

क

क

क

.

string क variable क

क

उ

.

methods

provide क

क

modification क

string object

एक

generate

क

string object

क

क

.

Operations on Strings

String Length क

string

length( )

उ string क length

characters क

क

.

क

ए

उ

. क

क

length( ) method call क

.

Example

String Concatenation क Example

strings क

क एक

क

.

string concatenation क

.

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क

.

Example

charAt( ) method method array क Example

क indexing

एक character क extract क ए

उ क क

क

ए

क

. क

एक character क extract क

string क क

.

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Equals( ) method क compare क क

false

औ

equal एक

.

क compare क

क

क क

argument क

क

true क

क

औ

.

Example

indexOf( ) method क

string क

index

क

ए

sub-string extract क

क

sub-string

क

क

उ क

.

क

.

Example

substring( ) method क

index औ end index argument क string

क

.

क

ए

क .

. start index

start end index क क

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Example

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Chapter 7 Arrays This chapter covers    

What are arrays? Creating an array Initializing an array Displaying an array

What are arrays? क

Array क

.

syllabus क

array

. Arrays एक programming

Array similar क क

.

क need

क variables क क क array

ए

क

. Array

employees क salary क array क

औ

क

क

क क

. topic

word क

programming

.

क

similar employees क

क int, float, char

क

क .

क

You can download this EBook from www.besthinditutorials.com array

ए क

उ

क

variables उ

क

size क

उ क index क

BCA क

access क

array क

4

.

ए

क

क

क

6

क array क index

Arrays क index

क

. Array क

.

एक classmate

.

ए क

array

arrays उ

element

first ए

क

क

lecturer

array क क

. .

ए

zero

array क

array क

n

element (n -1)

array क size 5

क array क

array क index

क

element 22 4th

.

Creating an array Java

array

ए क

.

क

क

ए क

.

type array_Name = new type[sizeofarray]; क array

type array_Name new =

array क

keyword

size of array -

.

ए क क

ए

array क memory allocate क array क

Example

int salary = new int[10];

.

ए

क

ए array

क

. क

.

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Initializing an array Arrays क

initialize क

2

क

array क क क

. एक क

एक particular index

ए

क

क

कक

.

क

.

Example

salary [4 ] = 10000; ऊ

array क

एक

ए औ उ

ए ए

एक एक

क

array

Example

Scanner s = new Scanner(System.in) for(int i=0; i<10; i++) { salary[i] = s.nextInt(); }

Displaying an array ऊ

ए ए

क

array क values क

Example

System.out.println(salary[4]);

Example

for(int i=0; i<10; i++) { System.out.println(salary[i]);

क

क

.

You can download this EBook from www.besthinditutorials.com }

Multidimensional arrays क dimensions

array क example क

one dimensional array .

.

एक two dimensional array array

ए क

row औ column क

Creating two dimensional arrays Example

int TwoDiem[ ] [ ] = new int [3] [4];

Initializing two dimensional arrays Example

Scanner s = new Scanner(System.in); System.out.println("Enter the array elements"); for(int i=0; i<3; i++) { for(int j=0; j<4; j++) { TwoDiem[ ][ ] = s.nextInt(); } } Displaying two dimensional arrays Example

for(int i =0; i<3; i++) { for(int j=0; j<4; j++) { System.out.println(TwoDiem[i][j]); } }

क array क क

.

क क

क

. एक two dimensional

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Chapter 8 Operators This chapter covers  

What are operators? Types of operators

What are operators? क क

operators क उ

.

ए

operations perform क

operations

क

ए

ए

.

. 2

क

operands क

unary औ binary . एक operand

. Unary

ए

क

क औ

apply

उ 2 operands

. क

6 1. 2. 3. 4. 5. 6.

.

Arithmetic Operators Logical Operators Bitwise Operators Relational Operators Assignment Operators Conditional Operator

Types of Operators Arithmetic Operators क क

Arithmetic 5

क

.

क

क

ए

क

.

क

You can download this EBook from www.besthinditutorials.com Addition Addition

क

2

क

क

ए

क

.

-

a=5, b=3;

Example

c = a+b; Subtraction एक

Subtraction

क subtract क

क

ए

क

.

a =10, b=9;

Example

c = a-b; Multiplication क

क multiply क

2

क

ए

क

.

a =3, b=3;

Example

c = a*b; Division क

एक

क

क

ए

क

क

.

a=10, b =2;

Example

c = a/b; Modulus क

क

क

क

ए

क

.

a= 10, b=3;

Example

c = a%b;

Logical Operators operators क

क

operations क

. क

क

क

ए

क

क

.

ए

क true

Logical AND (&&) क ए

क

ए true

क false

true .

क true

. क

क

3 false.

You can download this EBook from www.besthinditutorials.com a = true, b = flase;

Example

c = a&&b ; // c क

false

Logical OR (||) क

ए

क

एक क

true

true

.

a= true, b = false;

Example

c = a&&b; // c क

true

Logical NOT (!) एक unary

एक

.

ए

उ क ए

क

क उ

औ

क

.औ क

.

ए ए

क

ए .

Bitwise Operators क

by उ

क

ए

.

क कउ

क

.

क

4

.

Bitwise AND (&) 2

ए

उ क क क

2

क

क

क

क

क

क

.

क

क

. Bitwise OR (|) क

क

.

Left Shift (<<) क , क

क क

क

ए

क

क

क

क

क

क

उ क

ए क

क क

क .

.

Right Shift (>>) क , क

क क

क

क

ए क

क

क ए

क

क

क

उ क

क right क

.

क . Right

You can download this EBook from www.besthinditutorials.com Relational Operators 2

ए

क

क

क compute क

ए

एक

.

ए

क

एक

एक

क

.

क

ए

IF क

.

Equal to (==) ए

true return क

equal

.

Not equal to (!=) ए

एक

क equal

true return क

.

Greater than ( >) क

ए

क

ए

क

ए

क

ए

true return क

.

Less than (<) true

.

Greater than equal to (>=) क true return क

ए

क

ए

उ क

.

Less than equal to (<=) क

ए

क

ए

उ क

.

Assignment Operators क

औ

क

ए

क

क

.

Simple Assignment (=) ए

.

क

left

ए

.

Plus and Assignment (+) औ

क

क

क क

क

ए

.

Minus and Assignment (-=) क .

क

क subtract क क

क

You can download this EBook from www.besthinditutorials.com Multiply and Assignment (*=) क ए

क

क

क

multiply क क

क

क

.

Divide and Assignment (/=) क ए

क

क

क

क क

क

क

.

Conditional Operator (?:) क एक ए

क

क

क according

क

एक क क

क क क

क

ए

क

ए

क

. क

.

क .

ए

-

Example

a = 5, b = 3; a

c = a>b ? a : b // क क

क क

.

c

?

क

क

. क

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Chapter 9 Control Statements This chapter covers  

What are control statements? Types of control statements

What are control statements? क

क

क

क क क

. क

कघ क

एक

क क

क

कए

क

even क एक औ उ

क

क

क

क

क execution क क ए

कक कउ

. क कक

क क

क क execute क

क

)क

. Iteration statements एक एक

क

.

statements एक

. औ Jump क .

क

क

कक

.

औ

क execution (

according

odd.

email औ

ए .

क 3

even

email id औ

क कक

औ क

क

.

क

क

क

क

.

कक क

email औ

क

क क

क

.

.

उ क

क according क

क

उ

क

.

क

क

कक

क क क क .

. Java क execute क

You can download this EBook from www.besthinditutorials.com

Types of Control Statements Selection Statements क

क

क

क

क क क

execute execute क

क

क क क execute क क

false 3 क

.

.

क

.

IF Statement क

क

-

if ( condition ) { ए

//क

execute

.

}

क

क

क

ए

क

.

क

क

क

क

क

.

क

क

execute क

कक

क क

क

condition

.

condition

execute क

.

Example

int a = 5, b = 3; if ( a > b) { System.out.println("A is bigger than B"); }

IF Else Statement ए

क क

execute क

. क

.

ए

if ( condition ) { // when condition true } else

क

ए क

क क

false -

You can download this EBook from www.besthinditutorials.com { //when condition is false } ए

2क क

false

क

क

औ else क

. If क

क

क

कक

execute

execute

condition

.

Example

int a = 5, b = 3; if (a > b) { System.out.println("A is bigger than B"); } else { System.out.println("B is bigger than A"); }

Nested IF Statements एक if क

क

condition क क

2

क

क

एक

क

.

.

Example

int a = 4; if (a > 0) { if( a /2 == 0) { System.out.prinln("A is Even" ); } }

क

. क

क execute

You can download this EBook from www.besthinditutorials.com

क

क

क

execute

.

कक

क

ए

क

.

Switch Statements क ए

क

क

क according execute क

क क .

ए

क क

क according .

Example

int num = 3; switch (num) { case 1 : System.out.println("ïf number is 1"); break; case 2 : System.out.println("if number is 2"); break;

case 3 : System.out.println("if number is 3"); break;

defalut: System.out.println("if number does not match any condition"); break; }

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क ऊ

case ए

क

क

ए ए क

उ

क

उ

ए ए example

क क

execute

variable क

क

क क

3

क क

ए

execute

क

क

क

.

.क

ए

क

. क

.

execute

क

3क

क

क

क execute

.

Iteration Statements क

क

क

क execute

क

कक

क क

एक

ए

क

क

क

iteration

क

क

कक

क

execute क क

statement

execute क .क

क

.

क

क

क क कक

क

false क

क

.

execution ए

एक

औ उ

क execute क क

.

.

एक

. Iteration क

क looping

.

.

For Loop औ क

क

क

.

-

Example

for(initialization; condition; increment) ; { // statements }

Initialization क initialization क

एक .

ए

क क

ए

क ए

क

.

क

.

क क

Example - for(int i = 0; condition; increment);

. क

.

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Condition कक

क क क

.

क

क

.

क

औ

क execution क

क

.

क

.

क

क क

execute क

;

क

?.

क

execute क

.

initialized

ए

क

.

Example - for(int i = 0; i <10; increment) ;

Increment ए

initialized क

उ क

ढ़

क

क

execute ?औ

क

क ए

.

क

क

कऔ

?औ

क

क

Example for(int i =0; i<10; i++) { // }

Example

class IterSta { public static void main(String args[]) { for(int i =1; i<=10; i++) { System.out.println("Numbers from 1 to 10"); System.out.println(i); } } }

You can download this EBook from www.besthinditutorials.com While Loop While क

. While क

क

क

औ

कक

क

.

क

क

initialization

.

क

.

.

initialization;

while (condition) { // statements

increment; }

Example

class WhileStat { public static void main(String args[]) { int i =1; // initialization not compulsory while( i<=10) // condition { System.out.println(i); i++; // increment }

While

क

क क

क

ए

क

क

क क

क

एक

क .

ए क क

क

क

. While

क

क

क

क

.

क क

क क

.

कए

You can download this EBook from www.besthinditutorials.com Do-While Loop औ while क

.

ए ए

क execute क

क

execute

क

क

एक

.

execute

क

क

.

क

औ

क do-while

.

क

execute

क

एक

execute

.क

एक

कक

क

execution

. Example

class DoWhileStat { public static void main(String args[]) { int i=0; //initialization do { System.out.println(i); i++; // increment }while(i<=10) // condition } }

Jump Statements क

क 3 क

एक

क

ए ए

कक

.

-

Break statement क

क

क

क

क क

एक क

क

क

cases क

क

ए.

एक क

क execution

क

क

क .

क

कक ए

ए क

. ए

ए क

क

.

.

औ उ

एक क

execute क

क

ए

क .

औ उ

कक

You can download this EBook from www.besthinditutorials.com Example

break;

Continue statement क

क क

divide

क

कक

क

क

क क

.

क क

क

ए

क

एक

100 क

उ क

iteration क क

क

.

ए औ

क

क

क

औ

क

क

क

.

2क क

क .

क

क

2क

क

क iteration

क iteration execute

100 क क

1

2

क

क

.

क

ए .

Example

continue;

Return statement क

Return क

return क

. .

क

.

Example

return;

क

एक

क

एक

.

क

क

क

. औ

एक

return उ क

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Chapter 10 Classes This chapter covers   

What are classes? Advantages of classes Creating a class

What are classes? क

?? औ

.

क

???

. क क

क

ए

एक

ए क

क

.

क

. क

.औ

क

ए

क

क

. एक entity औ उ

attributes क

क

क

.

entity

क

ए

क क

उ .

क

क

,उ ,ए

औ .

क ए क

क

औ उ

. क

क

.

एक

क

क एक

क

.

औ उ क

क ए

ए

ए क

क .

क क

एक java

क

क

क execution

क

एक

.

.

Advantages of Classes क

क क

advantages क

क

क

-

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Security औ उ क

औ क

ए

क

.

क

क

. Reduce Complexity क

ऊ

क

क

क

क

क क

औ

क

क

.

क complexity

.

Separation क

क

क

क

क

क

औ उ

क

(methods) क क

(methods)

क

क

( क

क

.

एऔ

.

क

क

औ उ

क

.

औ उ क

.

क

)

क

क

ए

ए

क

कक

उ

क

एक

एक

क

.

Purchases क

Sales क

क

क

ए.

Focus on Data क ए क

क

औ

क

क

क

ए

.

क

.

ए

क

ए

ए क

.

Creating a Class ए क

क

क क क

क

.

ए

क

क

-

Example

class Person { String Name="Vipin"; int age=24;

क

क क

क क

.

एक

ए. ए क

क

ए. क

You can download this EBook from www.besthinditutorials.com public static void display() { System.out.println("Name is "+Name+ "Age is"+age); }

public static void main(String args[]) { display();

}

}

ऊ

ए एउ

age .

एक

क

क

एक

ए क क

.

क

क

name औ

क

क

क execution main

.

ए

क क

. क

ए

2

क

.

क

क

.

क

क

क

क

क

क

ए

क

क

.

-

Main Method एक

क

एक

.

क execution उ

क

क

क

क औ static

. क

ए क

औ

क क ए

environment

.

क

क

क

क औ

execute

.

क ए

क static

ए

क

कए

क

क. Static

क

क

.

क

environment क

क ए

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Instance Variables and Methods ए

क

ए

क

उ

ए

क

. Static Variables and Methods क ए

ए क

औ क

क

क

ए

क

क

क ए क

.

क

क

क

. ए

क क

क उ

.

Command line argument क

array

.

क

क

क

क .क क

उ

क क according

क.

क

क

क

क

ए क .

.

You can download this EBook from www.besthinditutorials.com

Chapter 11 Objects This chapter covers  

What are objects? Creating objects

What are objects? एक ए क

एक क

. ए क

क

ए

new क

ए क

. ए

क उ

क

क

क

क

क ए क

.

ए . क5

ए ए .

Steps to create an object क

1. क

2.

क

ए

ए क क

उ .

क

क

. क

क

ए. 3. उ क

equals (=)

4. उ क

new क

5. New . Example

class Person {

. क

औ उ क

क

क

क

You can download this EBook from www.besthinditutorials.com String Name="Vipin"; int age=24; public static void display() { System.out.println("Name is "+Name+ "Age is"+age); }

}

class PersonObj { public static void main(String args[]) { Person p1 = new Person(); p1.display(); } }

ऊ

ए ए example

क execution उ

2

PersonObj क

ए क

ए

क

ए

क

क

क

ए

क

औ

कउ

क क

क ए

(क

उ

()

क

ए

class

क

2

क constructor क क

create क क initialize क

क

क

क .

.

क

.

क constructor क क

(= new Person (); )

ए

.

.

? Constructor

क

ए क

(.)

ए क क

क

क उ

क

constructor

क

.

)

क

क

.

.

You can download this EBook from www.besthinditutorials.com Example

Person p1; p1 = new Person();

objects .

क

create क क

Example

Person p1:

.

क initialize

क

reference variables क

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Chapter 12 Constructors This chapter covers   

What are constructors? Rules for creating constructors Types of constructors

What are constructors? क

क

ए क

क initialize ए

क

क ए

ए क

. क

क

memory

क

.

क

constructor

क उ

क initialize क

. Constructor एक Constructor क क

return

क

क

, .

ए क

क2

1. Constructor क

औ

2. Constructor क क

return

ए क

same

-

क

problem क ए क

. उ

Rules for Creating Constructors Constructor

क क

क.

allocate

automatically

default constructor क

.

allocate

ए

क

alloacate क

क according

initialize क क initialize

क

क क

.

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Types of Constructors 4 क

क constructors

explain क

-

Default Constructor क

constructor क

क

.

क

Constructor

constructor

ए क क

.

Normal Constructor ए क

constructor

औ

क

क

ए

क

Example

class Person { String Name; int age;

Person() //Constructor { Name = "Vipin" age = 24; }

public void display() { System.out.println("Name is : "+Name+" Age is : "+age); } }

class NorCon { public static void main (String args[])

क

.

You can download this EBook from www.besthinditutorials.com { Person p1 = new Person(); // calling constructor and initializing object p1.display(); } }

ऊ

ए ए example

ए क

automatically क

औ

ए

क constructor

क

क

.

Parameterized Constructor constructors

क

parameters

variables क

क

क

क

.

ए क

. ए

क assign

Example

class Person { String Name; int age;

Person(String n , int a ) // Parameterized Constructor { Name = n ; age = a ; }

public void display() { System.out.println("Name is : "+Name+" Age is : "+age); } }

.

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class NorCon { public static void main (String args[]) { Person p1 = new Person("Vipin",24 ); // calling constructor and initializing object p1.display(); } }

ऊ

ए ए example ए

क initialize क

create क

ए

क

क

औ

.

Copy Constructor क

constructor क क क

क

औ

क क उ

same उ

क

.क

क

क

क

ए

ए

क

.

क

क क

constructor

argument क

एक

क

ए क

.

Example

class Person { String Name; int age;

Person(String n , int a ) // Parameterized Constructor for p1 object { Name = n ; age = a ; }

क

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Person(Person p ) // Copy Constructor for p2 object { Name = p.Name; age = p.age; }

public void display() { System.out.println("Name is : "+Name+" Age is : "+age); } }

class CopyCon { public static void main (String args[]) { Person p1 = new Person("Vipin",age); Person p2 = new Person(p1); // calling constructor copying object p1.display(); p2.display(); } }

ऊ same

ए ए example .

क

क

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Chapter 13 Methods This chapter covers   

What are methods? Structure of method definition Structure of method call

What are methods? क

क क

क

क

. औ

एक क

क क क

क

कक

एक एक

एक

क क

क

क perform क

औ

उ

क

क

क

क

एक

उ

क क

क

क एक

उ

क क क

क क

औ उ क उ

??.

क क

एक text औ

.

क क

ए क

ए

क क

.

क एक .

क

. क

क

क

println() method.

उ क

क क क

. क

क क separate क -

क

ए

एक

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Structure of method definition access_specifier return_type method_name (argument list) { // statements to be executed }

Access specifier क

क

उ क

क

क public

.

private

static.

Return type execution क int

क

क

क

return क

string.

Method name method क

क

ए

Argument list क क

variables क क

return क

क

Structure of method call If in the same class method_Name ();

If in another class object_Name.method_Name();

Example

class PersonsInfo {

addition क

.

क क

क

return क

क 2

क

You can download this EBook from www.besthinditutorials.com Public static void Separator()// our method which separates information of persons { System.out.println("-----------------------------------------------------------------------------"); }

public static void main(String args[]) { System.out.println("Name : Depika Padukaun Age : 23"); Separator(); System.out.println("Name : Vipin

Age:24");

Separator(); System.out.println("Name : Radha Age : 23"); Separator(); System.out.println("Name : Krishn

Age:24");

} }

Output

Name : Sita Age : 23 ------------------------------------------------------------------------------Name : Ram Age : 24 -------------------------------------------------------------------------------Name : Radha Age : 23 ---------------------------------------------------------------------------------Name : Krishn Age : 24

क क

print

method persons क

ए

क क

क .

क

क

You can download this EBook from www.besthinditutorials.com Void Void क

क क

return type क

क

क void

क

.

.

क

You can download this EBook from www.besthinditutorials.com

Chapter 14 Inheritance This chapter covers    

What is inheritance Types of inheritance Inheriting a class Example

What is inheritance? क

क

क

class

क

क

क

.क

क क

class उ

class

एक

code क

क re-usability क एक class

एक class क

क

क extend क

class क

ए

क

क क

एक

क

क

.

क

ए

extends क extend

क

औ

class क ए

Final क

क

क

. . औ

क

क

क

क क

.

.औ

उ क क

क

ए क उ

class एक क

implement क क

super क

. ए

ए

.

class क extend क subclass क

क

reuse क

क .

क

. Inheritance क

क

multiple inheritance क

allow

क

क

.

class क क Final क

ए

क

क

क उ

ए

क

उ

क

inheritance क

औ उ

class

क

क ए

class क extend क Inheritance

क

एक class क features

क

क औ

क class क क क

औ क ए क

. ए

क

क उ क

क ए

क

You can download this EBook from www.besthinditutorials.com क ए

क

क क

उ क

ए

ए

subclass

.

Types of Inheritance एक

Single inheritance

क extend क

Class A | extends | Class B

Multilevel inheritance

extend क

क एक

extend क

Class A | extends | Class B | extends | Class C

Hierarchical inheritance

एक

क

Class A / extends / Class B

\ extends \ Class C

extend क

You can download this EBook from www.besthinditutorials.com

Inheriting a class क उ

क inherit क

क

क क

क

extend क

class otherclass // class you want to inherit {

} class yrclass extends otherclass { // now you can access other class public methods and variables }

Example from oracle.com.

public class Bicycle { // the Bicycle class has three fields public int cadence; public int gear; public int speed;

// the Bicycle class has one constructor public Bicycle(int startCadence, int startSpeed, int startGear) { gear = startGear; cadence = startCadence; speed = startSpeed; }

// the Bicycle class has four methods

extends क

क

You can download this EBook from www.besthinditutorials.com public void setCadence(int newValue) { cadence = newValue; }

public void setGear(int newValue) { gear = newValue; }

public void applyBrake(int decrement) { speed -= decrement; }

public void speedUp(int increment) { speed += increment; }

} public class MountainBike extends Bicycle { // the MountainBike subclass adds one field public int seatHeight;

// the MountainBike subclass has one constructor public MountainBike(int startHeight,

You can download this EBook from www.besthinditutorials.com int startCadence, int startSpeed, int startGear) { super(startCadence, startSpeed, startGear); seatHeight = startHeight; }

// the MountainBike subclass adds one method public void setHeight(int newValue) { seatHeight = newValue; } }

You can download this EBook from www.besthinditutorials.com

Chapter 15 Exception Handling This chapter covers     

What are excetions Keywords (try, throw, catch) Steps to handle exceptions Some common exceptions Example

What are exceptions? Exceptions

. Exception एक

error

क

क

.

ए

क

ए

एऔ

क

क

उ

क

ए

क

क

.

औ compile

out of memory ए

execute

क

.

.

क क

exception

औ

. क

क

क उ

क execute

memory

क execution क

क क

ए

क

situations क

error

ए

ए

क

ए

ए

क क

ए

execute

.ए

क

क

.

Keywords क

Java

क

structure क

keywords क

:

ए क

क easy .

क

क

. क

क एक क

क

You can download this EBook from www.besthinditutorials.com Try क

क

क ए

क

उ

क

try

.

Catch क

क

try

ए

generate

क catch क

औ

क

.

Throw ए क

ए

क

java

ए

क exceptions

.

exceptions क

औ

define

क

क

ए

throw क

java

क

क उ

क

.

.

Throws क

method ए

throw क

exceptions क

क

. क

generate

उ क

क

क

throws क

क

कउ

exceptions

.

Finally क

Exceptions एक क

क

क

ए

क

execute क

execute क औ उ क

उ क

क

.

क

क

ए .

terminate

Steps to Handle Exceptions उ क

1. कक

2. Try क

क try क

catch

उ क

क

क

exception generate

उ exception क क क

ए

क

.

generate

क

Example

catch(ArithmeticException e) 3. Catch क

क क

4. Exception क

उ

exception क

क

क

क

situation

. क

क

execute क

उ

क

Some Common Exceptions क

exceptions

exceptions क

message

. Exceptions क

java क

ए

.

क

exceptions

क

You can download this EBook from www.besthinditutorials.com क

क

औ

skill क improve क

exceptions क

क

.

क

java

क

-

Arithmetic Exception क

क

arithmetic error ए

उ क

क

क

divide क

क क

क

कक

क

क

ArithmeticException generate

. Class Cast Exception क

एक

क

क

क sub

क

औ

ClassCastException generate

.

Array Store Exception औ उ

array

ArrayStoreException generate

क

string

क क

क

.

Array-Index-Out-Of-Bounds-Exception array क क ए

10 क

औ

क क

क

11th क

क क

क

11

ArrayIndexOutOfBoundsException generate

Illegal Argument Exception क

क

IllegalArgumentException generate

int क

string

क

.

Null Pointer Exception क

Java क

reference क null क

क क

क

assign क

क

NullPointerException generate

Number Format Exception क

string

क number

NumberFormatException generate

क

क

क .

क क

क

null .

.

You can download this EBook from www.besthinditutorials.com Example

You can download this EBook from www.besthinditutorials.com

Chapter 16 Interfaces & Packages This chapter covers      

What are interfaces? Example What are packages? Creating packages Using packages Some common packages

What are interfaces? allow क

क

. Interfaces

interfaces क

क

क

क

उ क

. क

Interfaces

क

क

क object

create क

. Method क

extend क

क औ methods क

क

interface क

. क

Interfaces interfaces क ए

ए variables static औ final

क

एक

क क

एक

उ क

Interfaces fruit

क

.

औ एक Is-a relation ए

क

interfaces

उ क

क

establish क

Is-a mango क क

एक

. क

Is-a

ए. एक

.

क

क

औ

. उ

mango क

क

क

ए क

fruit

क Mango is a fruit.

एक

क

interfaces

क क

You can download this EBook from www.besthinditutorials.com Interfaces क

क ए

public public

क ए

ए

क

interface keyword

public क

क

.

क

.

.

Example

public interface Fruit { void DisName(); }

class Mango implements Fruit { void DisName() { System.out.println("Mango Is-a Fruit"); } }

ऊ

क एक क

example

क

क

Fruit

औ Fruit interface क DisName()

Mango

क

example क

Mango

.

What are packages? क

क क क

क

. क

???

क

क

क

problem ढ़

क उ

क

क

क

??.

ए

.

क एक

. क क

क ए .

क क

क

क

क

एक

क क

क

क

क error show क क

क

.

एक same .

execute क

possibility

ए

. problem

क

क

ए java एक

You can download this EBook from www.besthinditutorials.com क क

क

ए

औ

ए क उ

क

क

error generate

औ

क

ए . क क क

packages

क

same

क

क

.

क

. Packages क

. एक क

क

programmer क productivity ढ़ क

ए

एक

क क

category क classes क

उ

क

.

क classes औ interfaces क categories क

Java packages क

क

2

error

error क

क

.

same

Package क ए

एक package

क

maintain क

packages

क

औ production

sales package

related classes

production package

क

Java packages

क classes औ interfaces क access protection provide क क

class

ए क

packages क classes access

क

.

क

access modifier

क

कउ

packages क level क protection provide क क

क ऊ

same

classes

क

.

क

.

क

package-private modifier apply .

क java packages क ए क

.

.

related classes

package

क

packages

java packages क

amazing

.

Creating packages ए क

Package

क

ए

क

क

क

क

औ उ क

क

क

: Example package newPackage;

क क

ए. क

क

ए

क

. उ क एक

क

क

क

.

क

ए .

क

Using packages क क

.

क क

क

क

उ

क

क

You can download this EBook from www.besthinditutorials.com Example import newPackage;

क

क

क

क

क

क package क

क

क

क

क

क

.

क

औ उ क

क

क directly क

औ

package member access

क क

.

access क क

उ क

.

import packageName.className; Example import newPackage.myClass;

Some common packages एक main package

Java

क क

.

क

Java API Package क

ए

package

packages

क IO package औ AWT package .

ए

.

packages

java

क

tasks

क

. क

common औ

क

packages क

क

क java.language package

java क

.

ए

क

.

java.util क

package

क vectors hash tables

.

java.io उ

package क

क

क

.

औ

उ

क

ए

.

java.AWT क

package क

क

क

ए

क

ए

.

,

ए

क

,

.

java.net क क

package

ए

क

क

.

. java.applet package ए

ए क

औ

क

क

ए

क

.

क

ए

You can download this EBook from www.besthinditutorials.com

Chapter 17 Multithreading This chapter covers    

What is multithreading? Thread class Runnable interface Synchronization

What is multithreading? क

ए

क

क

एक

क क

एक

क

क

उ

क

ए

क

क

क

.

क क

एक

क क

क

ए

JAVA क क

.

JAVA क

क

क

क

.

Multitasking क

क

क

Multi-threading क क

क

. एक multi-threading क

.

क

2

Thread क क

क2

क

2

.

.

क

क

क

run() औ

क क

क

Runnable

क

thread

क

run()

.

Thread class क

Thread क

क

क

Thread run()

क

क क

.

क

Thread class Runnable Interface क

ए

क

क

क

JAVA  

औ

क

ए .

You can download this EBook from www.besthinditutorials.com Thread t = new Thread;

ऊ

ए ए ए क

क

क

thread

ए क क

thread

क

क

क ए

क start()

क क

क

क

ए

क

क क

start()

क

t.start(); क क

start() क

क

क क

.

क

. क

क

public void run() { //

क

ए

}

कक 1. getName 2. getPriority 3. isAlive 4. join 5. run 6. sleep 7. start

क

क

thread

क

.

क क क

क

. run()

execute क

क

You can download this EBook from www.besthinditutorials.com Example

क ए

Thread

क

क

. ए example

क

क

Thread start() औ run()

ए क क

क

क

क क ऊ

.

Runnable interface ए क

क

क क

Runnable Thread क start()

क

क क क

क क

. क

.

क .

Runnable ए क

औ

क क

क .

argument क क

ए

You can download this EBook from www.besthinditutorials.com Example

This क क

क

उ

क

क

क

क एक

. क run()

क

ए

क क

क

क

उ

क

This क

.

क

क

उ

.

क

start()

क

.

.

Synchronization 2

2

conflict ए

क thread क क

ए

क

क.

एक resource

एक technique

उ क ए

. .

क

technique क

Synchronization क concept क

क क

access

conflict क एक

synchronization क ए

एक thread

.

monitor क क synchronized

. क

क

क

You can download this EBook from www.besthinditutorials.com क

ए क

क

एक lock क ए

threads

waiting

क

क

.

क

क औ

suspend

.

Java

क

Synchronization 2

क

:-

1. Synchronized method 2. Synchronized statement

Synchronized method क

क synchronized

क

.

क एक

उ क एक

execute क

क क

Synchronized

.

Example:

class bank { synchronized void withdraw(int amount) {

} }

Synchronized statement क

class उ

synchronized

क

synchronized कक

क synchronized

Example: Synchronized (s1) { // }

क synchronize क

उ

.

.

You can download this EBook from www.besthinditutorials.com

Chapter 18 File I/O This chapter covers   

What are streams? Byte streams Character streams

क

क

input console

. enter क

क

औ software

क क

read क क

.

.औ क क

क

क

output .

क

औ output

क

क

input

.

औ क

उ output क

solution file

??

read क

input console console

क

human

उ output क क

situation क क

provide क क

file

क

input

.

classes क

क

औ output

console (command prompt)

क क

क

क

क

क

text file

क

file

क

. Java

औ output क

store क क

file

You can download this EBook from www.besthinditutorials.com

What are Streams? Data क sequence क stream क

.

क

streams 2

-

Input Stream Input stream

input

.

Output Stream Output stream

Input stream औ Output stream

output

क

2

.

byte stream औ character stream.

Byte Streams Byte stream

bytes क

.

input औ output क

ए 2 classes

InputStream औ OutputStream. InputStream class एक abstract क

.

.

class क क

एक byte input stream class . FileInputStream class methods

FileInputstream class

क

extend

.

Methods of InputStream Class

OutputStream Class एक abstract क

.

. कक

एक byte output stream class . FileOutputStream class methods

ए ए

FileOutputStream

क

.

extend

You can download this EBook from www.besthinditutorials.com Methods of Output Stream class

FileInputStream Class FileInputStream एक byte stream input stream

ए क

.

क object

.

ए क क

call क क bytes

read( )

क

byte input .

Example

FileOutputStream Class FileOutputStream एक byte stream output output stream write क Example

.

ए क

.

उ

. write ( )

क क

ए क क क क bytes क

byte

You can download this EBook from www.besthinditutorials.com

ऊ

ए ए example ए

byte stream

क

क

k

क

ए क

.

Character Stream Character stream

क

bytes

input औ output क

ए 2 classes

character क

क

. Character stream

Reader औ Writer .

Reader Class Reader एक abstract extend क

.

एक character input stream

क

.

ए

. FileReader Class

.

Methods of Reader Class

Writer Class एक abstract क

.

. कक

एक character output stream ए

.

FileWriter

FileWriter Class

क

extend .

You can download this EBook from www.besthinditutorials.com Methods of Writer class

FileReader Class FileReader एक character stream input classes . character input stream क

ए क

.

उ

क

create क क

read ( )

क

क क data read

क object

ए क क

.

Example

FileWriter Class FileWriter एक character stream output class . output stream create क Example

.

उ

object

write ( )

क

character

क क data write क

.

You can download this EBook from www.besthinditutorials.com

You can download this EBook from www.besthinditutorials.com

Chapter 19 Serialization This chapter covers  

What is serialization? Serializable interface

What is serialization? क

औ उ

क

ए

.औ

क क

क

ए

उ क

औ

क.

process serialization क store क

.औ

members क values file क

Object क

.

object क serialize क

EmployeeName औ

क

process De-serialization क

क क

serialize क

क क

उ object क restore क byte stream क

क

क

क state क save क

क

object क current state

.

क

क .

.क

??. क

क .

क क

क

. save क

क

stages

क

??. store

employee क

.

क क

store क

object क De serialize क

value memory

क file

load

.

Serializable Interface क

object क serialize क

क

interface implement क objects

serialize क

क Serializable

serializable interface implement क

. क

ए

.

उ क

You can download this EBook from www.besthinditutorials.com Example

ObjectOutputStream Class क

object क file

क

.

store क

ए

FileOutputStream

ObjectOutputStream serialize क Example

क

क

क ObjectOutputStream क object writeObject ( )

उ

argument क

क

.

क

क

क

.

क object create क औ

You can download this EBook from www.besthinditutorials.com ObjectInputStream Class क क object

क ए क

ObjectInputStream उ

Example

क क

क

memory .

ए

क ObjectInputStream

FileInputStream Class क object

क object

क

readObject ( ) क

.

क

क

.औ

क

.

क क

You can download this EBook from www.besthinditutorials.com A Complete Example of Serialization

You can download this EBook from www.besthinditutorials.com

Chapter 20 Collections Framework This chapter covers  

What are collections? Other interfaces

What are collections? java collections क

data structures क

objects क एक

. Java

क

structures(set, list, queue, array )

क

objects क

) perform क

क

Collections framework

क

.

क

क

क

classes

क क

ए

collection क .

collection

क

interfaces क implement क क

. Collections framework क

क

data

. क

objects क organize क

ए object क

क

Collections Framework क

normal

extend क क

ए

क

operations (Searching, Sorting, Insertion, Deletion

क

classes provide क

क

structure क

.

data structures क collection क

.

organize क

क क

ए क

.

interfaces औ क

.

क

data structure

interfaces औ classes generic .

interfaces औ classes क

क

क

-

Collection Interface क

collection define क

Collection interface क

क

collection interface implement क

methods . ए

interface क methods क

क

collections

ए क

interface क implement क -

ए

.

methods क Collection

You can download this EBook from www.besthinditutorials.com

List Interface ArrayList औ LinkedList ए क क objects

list interface क implement क

objects क

store क

क

क

क

क

क

.

. एक list collection

duplicate

.

ArrayList Class

LinkedList Class

Set Interface HashSet औ TreeSet क

क

set interface क implement क क

क

. Set collection क

ए क क

. Set collection क

duplicate set collection

objects

ए क

क क

.

.

You can download this EBook from www.besthinditutorials.com HashSet Class

collection objects क

क

क

ए hash table

क

.

TreeSet Class

collection

objects tree form

.

Queue Interface queue interface क implement क

PriorityQueue क

First-In-First-Out form

.

queue collection

.

PriorityQueue Class

Map Interface HashMap औ TreeMap class Map interface क औ value क pair क

store क

. Map collection

क

ए elements unique

. Map collection

क store औ access क .

क

data key ए key

You can download this EBook from www.besthinditutorials.com HashMap Class

TreeMap Class

Iterator interface interface iterator ( ) method provide क return क

क

.

.उ

क

क

उ ए

collection क first element क index

iterator interface क

iterator interface क hasNext ( ) next ( )

call क क

collection क elements क

क

ए .

क

क

क .

create क क क क through

औ

You can download this EBook from www.besthinditutorials.com

Chapter 21 Lambda Expressions This chapter covers  

What is functional interface? What is lambda expression?

What is functional interface? Lambda expressions क क

interface interfaces क क उ

क

ए

एक abstract

एक method

क

एक

default abstract .

क

functional

.

. एक functional क Runnable

.

. एक hello()

Welcome. एक

औ

क message

क by क

,Example:-

Example

interface Welcome { String hello(String name); }

What is lambda expression? Lambda expression एक

क

ए

क abstract

functional

ए

क . Lambda expression क क क

conditions

.

execute क

क

क

abstract क

.

. क

available

क ऊ

औ ए ए

string define

क variable initialization,

.

You can download this EBook from www.besthinditutorials.com return statement औ method argument

lambda ए

available expression क क

return type क

body

ए

क

-

lambda

(->)

क

औ

(right)

क

.

available

क

क क

(left) क

औ

conditions क

क

.

एक

क body

क lambda ए क

.

class क

ए lambda

.

.

ए

Lambda expressions क क

conditions

ए

lambda क

क

functional interface क object

क

क

क

उ क

.

क

क

-

Example

Welcome wel; String name = "Vipin"; wel = (name)-> { System.out.println("Hello"+name); };

ऊ

lambda expression क

क

expression

क lambda क क

string

functional ए क

क hello() ए

.

apply ए

lambda

.

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Chapter 22 Generics This chapter covers  

What are generics? Example

What are generics? क क क.

addition क method

data type

क

औ float

क

क क

क

ए

क

क

क

क

ए

औ

क

क java

क generics क

क

.

execute क

क

औ क

क

क

क

क

.

classes, interfaces औ constructors क ए

method

.

classes, interfaces औ constructors generic .

क

क

क

क

क

possible ???

क data type क

क execute क

readability ढ़

उ

.औ

क क

औ क

क

methods

Java क

क

.

.औ

Generics क .

क क data type क

integers

क

double

क

क

औ .

generic एउ

क

. Java

क औ

क

You can download this EBook from www.besthinditutorials.com Example

ऊ

एउ

क

class क

क

क

class क

(< >) brackets

declare क declare क

generic

क

generic variable declaration क

variable क type generic

क

ऊ

ए क क

एक constructor

क

object create क

generic argument क

उ

convert

औ क क ए क

ए

क

क .

क

ऊ

क generic class क

argument

क

ए एउ

क

different क object

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Chapter 23 Applets This chapter covers   

What are applets? Applets life cycle methods Example

What are applets? Applet एक java ए

उ

क save क

क

उ ए

ए

क

उ

क

ए

क क

क

क

उ क क

ए

. क

उ HTML

visitor

उ

उ

क ए

क load

उ

क

. ए

.

क

.

ए Java.applet.Applet क

important

क

क

क

क

क

क

क

.

क applets client side applications

ए

उ

HTML

.

load

.class extension

क ए

क

क

औ

क उ

ए

save क

server

क

क

औ

क

क ए क

क

.

.

init () variables क initialize क क

initialization

क

.

क

क

क ए

ए क क

क उ

क

क क

. क

क

.

start() init()

क

automatically क

.

उ

ए

क

क

.

You can download this EBook from www.besthinditutorials.com stop() उ

क

क

क

ए

क

क

.

destroy() उ

क

क

औ ए

क क

paint()

ए

क

ए

क

क

क

ए

क

क

ए

क

क

start()

java.applet.Applet औ java.awt क

क

क

.

.

Example

class picture extends Applet { public void init() { void setBackground(color.red); }

public void paint(Graphics g) { g.drawString("Applet are for GUI",30,30); } } उ

drawString() coordinates क ऊ

show क

क

HTML page क

ए

ए

क

क

क

argument क

open क क

क क

java

औ browser क

ए ए

window क background color

setBackground()

ए ए example क browser

क

ए

क

open क .

क क

ए

क

क क एक

ए

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