Multi Dimensional Arrays

Multidimensional arrays are actually arrays of arrays.

   Syntax to create two dimensional Array

      dataType arrayName[][] = new dataType[size1][size2]

         (OR)

      dataType[][] arrayName;

      arrayName = new dataType[size1][size2]

   for Example consider the array of size 5*4.

      int arr[][] = new int[5][4];

00	01	02	03
10	11	12	13
20	21	22	23
30	31	32	33
40	41	42	42

Table 1 : Array indexes

100	553	512	-9
12	32	43	56
1	3	5	7
9	-87	-98	0
-12	46	78	97

Table 2 : Values stored in Array

When you compare table1 and table 2

arr[0][0] = 100

arr[0][1] = 553

arr[0][2] = 512

arr[0][3] = -9

Example

class ArrayEx{ 
 public static void main(String args[]){
  int arr[][] = new int[5][4];

  arr[0][0] = 100;
  arr[0][1] = 553;
  arr[0][2] = 512; 
  arr[0][3] = -9;

  arr[1][0] = 12; 
  arr[1][1] = 32;
  arr[1][2] = 43; 
  arr[1][3] = 56;

  arr[2][0] = 1; 
  arr[2][1] = 3;
  arr[2][2] = 5; 
  arr[2][3] = 7;

  arr[3][0] = 9; 
  arr[3][1] = -87;
  arr[3][2] = -98; 
  arr[3][3] = 0;

  arr[4][0] = -12; 
  arr[4][1] = 46;
  arr[4][2] = 78; 
  arr[4][3] = 97;

  /*Display Elements */
  for(int i=0; i<5; i++){
   for(int j=0; j<4; j++){
    System.out.print(arr[i][j] +"\t");
   }
   System.out.println();
  }
 } 
}

Output

100 553 512 -9
12 32 43 56
1 3 5 7
9 -87 -98 0
-12 46 78 97

      

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