ARRAY IN JAVA !!

Hiii… !!! Today I am going to tell you about the use of  array in Java..

Array !!

It is a type of data structure,which contains fixed size sequential homogeneous set of elements.

Syntax: (declaration of an array)

Datatype[] arrayname;

Example:

Int[5] n;

int c = 15;

int[] p={1,2,3,4,5};

Creation of an array:

• Actually in Java,array is act as object created by the new method.

Example:

n=new n[5]; \\ allocate memory for the 5 elements in array n

Some points:

•  When memory is allocated for an array, the elements are automatically initialized to their default values:  zero for all numeric primitive data types, false for boolean variables and null for references.
• The first element in every array is the zeroth element of that array.
• When accessing an array element, if the index is less than zero or greater than or equal to the array length then an ArrayIndexOutOfBoundsException is thrown.
• Arrays have a length data field (read only), specifying the number of elements in the array.
• The length data field can be accessed through the dot operator.

for ( int k=0; k < a.length ; k++ )

• System.out.println( a[ k ] );The bounds of an array are integers between 0 and length – 1…..

Coping of an array …

Elements of an Arrays can be copied by System.arraycopy() method:

Arraycopy() does not allocate memory for the destination array; the memory must already

be allocated.

Example: 

int[] p = { 1, 2, 3,4, 5 };

int[] c = new int[ p.length ];

System.arraycopy(p,0,c,0,p.length);  //copy array p to array c

Multidimensional array:

Java also support multidimensional array or you call call it as arrays of arrays.

This can be declared by appending the brackets after the array name.

Example:

Int[][] n=new int[5][5];  //integer array 5 x5 elements

          Int[][][] three=new int[2][4][5]; //integer array 2x4x5 elements

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Posted in: Java Programming language