Declaring and Initializing 2-dimensional arrays Java Program

class Arrays3
{

    public static void main(String args[])
    {

        // this declares a 2-dimensional array named x[i][j] of size 4 (4 elements)
        // its elements are x[0][0], x[0][1], x[1][0] and x[1][1].
        // the first index i indicates the row and the second index indicates the
        // column if you think of this array as a matrix.

        int x[][] = new int[2][2];

        // print out the values of x[i][j] and they are all equal to 0.0.
        for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
        System.out.println("x["+i+","+j+"] = "+x[i][j]);

        // assign values to x[i]
        for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
        x[i][j] = i+j; // for example

        // print the assigned values to x[i][j]
        for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
        System.out.println("x["+i+","+j+"] = "+x[i][j]);

        // this declares a 2-dimensional array of type String
        // and initializes it
        String st[][]={{"row 0 column 0","row 0 column 1"}, // first row
        {"row 1 column 0","row 1 column 1"}}; // second row

        // print out st[i]
        for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
        System.out.println("st["+i+","+j+"] = "+st[i][j]);

    }
}

Posted in: J2SE, Java