Double dimensional array in java

Double Dimensional Array in java is used to store data in tabular format. To access an individual element of DDA we require 2 indexes:- Row index and Element index.

Declaring DDA variable:-
int arr[ ][ ];
int [ ]arr[ ];
int [ ][ ]arr;


Defining DDA variable:-
arr = new int[4][3];  // here 4 is no of row and 3 is no of column
arr.length = no of row
arr[i].length = no of column


Initialising DDA:-
int arr[ ][ ] = {{90, 80, 70},{40, 50,60},{30, 20, 10}};


Assigning DDA:-
for(i=0; i<arr.length; i++)
    for(j=0; j<arr[i].length; j++)
        arr[i][j] = 100;