Java Programing laungage

Core Java Tutorial

Introduction of Core Java

How To Install JDk and Set of Path

Syntax of java Program

Difference between Java and C/C++

Advantage and Disadvantage of Java

What is Java

Why Java is not Pure Object Oriented Language

Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

Common Misconception about Java

Simple Program of Java

Integrated Development Environment in java

Compile and Run Java Program

Applet and Comments in Java

Tokens in Java

Keywords in Java

Identifier and Variables in Java

Literals/Constants

Data Type in Java

Assignments and Initialization in Java

Operators in Java

Rule of Precedence in Java

Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

Nested If-else and If-else-If Selection Statement

switch case and conditional operator Selection Statement

for and while Loop

do..while and for each Loop

break and labeled break statement

continue and labeled continue statement

return Statement and exit() Method

Escape Sequence for Special Characters and Unicode Code

Constants and Block or Scope

Statement in Java

Conversions between Numeric Types in Java

Import Statement in Java

User Input in Java using Scanner Class

User Input in Java using Console Class

Array in Java

One Dimensional Array

Two Dimensional Array

Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

Uneven/Jagged array in java

Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

Array in Java
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Array is a collection of same type of element. It is a data structure where we store similar elements. An array in java is an ordered collection of the similar types of variable . Java allows array of any dimension. An array in java is a bit different from c or c++. We can not specify the size of the array at time of declaration. The memory allocation is always dynamic. Every array in java is treated as an object with one special attribute, which specify the number of elements in the array. .to declare an array write a data type followed by [] followed by the identifier.

Array in java is index based, first element of the array is stored at 0 index.

Types of Array in Java

There are two types of array.

  1. Single/One Dimensional Array
  2. Multidimensional Array
Declaration an Array

Syntax :

type array-name[]; // no memory allocation takes place in declaration

or

type []array-name;

 

Where type defines the data type of array element like int, double etc.

array-name is the name of array.

Note: That declaration does not actually create an array. it only declares a reference.

Memory allocation with the help of new operator

In java, initialize an array can be done by using new keyword.

Syntax :

array-name=new type[Size] //Size must be a constant or a variable

Note:All the elements of array will be automatically initialized to zero.

Array index start with zero.

int a[];
a= new int[5];

or 

int a[]=new int[5];

Example :

int a[], b,c;//a is reference variable b and c is not an array reference variable

a=new int[5]; //is valid
b=new int[5];//is not valid
c=new int[5];//is not valid
		
		OR

int a[],b[],c[];// a,b and is reference variable

a=new int[5];//is valid
b=new int[5];//is valid
c=new int[5];//is valid

		OR

int [],a,b,c;//a,b and is refernce variable

a=new int[5];//is valid
b=new int[5];//is valid
c=new int[5];//is valid

		OR

int [],a,b,c;

a=b=c=new int[5];//is not valid

		OR 

int a[]={10,20,30,40,50};

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