int[][] m1 = { {1, 2, 3}, {2,3,4} , {1,1,1} }; 
        int[][] m2 = { {4,5,6}, {7,8,9},{4,5,7} }; 
        int[][] sum = new int[3][3];
        for(int i=0;i<3;i++){
           for(int j=0;j<3;j++){
           sum[i][j] = m1[i][j] + m2[i][j];
           System.out.println(sum[i][j]);
        }
        }