int[][] x = new int[][] { { 11, 21, 31 }, { 12, 22, 32 } };
int[][] y = new int[][] { { 11, 21, 31 }, { 12, 22, 32 } };

x=[[I@8807e25, y=[[I@2a3046da
x=[[I@12f40c25, [I@3ada9e37], y=[[I@5cbc508c, [I@3419866c]
                  x==y : false
   Objects.equals(x,y) : false
           x.equals(y) : false
    Arrays.equals(x,y) : false
Arrays.deepEquals(x,y) : true