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

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