Is there difference between arr.equals(anotherArr) and arr == anotherArr?

Question

Any array in java is Object. hence it has equals method. But I cannot watch realization of this method(or maybe is it possible ?)

I wrote several examples and always == and equals returns similar results.

Is there way when == and equals return different results ?

Answer 1

There is difference

1)

int[] a1 = {};
long[] a2 = {};
boolean r1 = a1.equals(a2);  // returns false
boolean r2 = a1 == a2;       // compile time error

2)

int[] a1 = null;
int[] a2 = {};
boolean r1 = a1.equals(a2);  // throws NPE
boolean r2 = a1 == a2;       // returns false

Answer 2

I don't think so this is the equalsmethod :

 public boolean equals(Object obj) {
        return (this == obj);
    }

And it internally uses == operator for comparison.

You can view the javaDoc here.