Java - Array Explanation

Array:-

        Array is a collection of items with same data type.

        Array elements are stored in consecutive memory location.

Syntax to 1D array:-

datatype arrayname[]=new datatype[arraysize];

eg:-

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

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

3) int a[];//declaration

          a=new int[5];//memory allocation

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

5) int a[]=new int[]{1,2,3,4,5};

Syntax to 2D array:-

datatype arrayname[][]=new datatype[rowsize][colsize];

eg:-

1) int a[][]=new int[2][5];

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

3) int a[][];

        a=new int[5][5];

4) int a[][]={{1,2},{3,4},{5,6}};

5) int a[][]=new int[][]{{1,2,7,9},{3,4},{5,6}};