int a[][] = { { 1, 2 }, { 3, 4 }, { 5, 6 } }, i, j;
        int b[][] = new int[2][3];
        for (i = 0; i < a.length; i++) {
            for (j = 0; j < a[i].length; j++) {
                b[j][i] = a[i][j];
            }
        }
        for (i = 0; i < b.length; i++) {
            for (j = 0; j < b[i].length; j++) {
                System.out.print(b[i][j]);
            }
            System.out.print("\n");
        }
    }