Same output for hashCode() and identityHashCode()

Question

Consider the following code:

public class MyClass {

    public static void main(String[] args) {
        Object obj = new Object();
        System.out.println(obj.hashCode());
        System.out.println(System.identityHashCode(obj));
        }
}

Output:

328332828
328332828

Then what is the use of using hashCode() and identityHashCode()?

Gokul Nath KP · Accepted Answer · 2014-09-15 08:31:58Z

2

JavaDoc of identityHashCode() Says:

Returns an integer hash code for the parameter. The hash code returned is the same one that would be returned by the method java.lang.Object.hashCode(), whether or not the object's class has overridden hashCode(). The hash code for null is 0.

To put it simply:

If you have overridden hashCode() method in your class, then calling identityHashCode() will invoke default hashCode() method, not your overridden method.

answered Sep 15, 2014 at 8:31

Gokul Nath KP

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Comments

Payne · Accepted Answer · 2014-09-15 08:35:59Z

1

hashCode is overrideable
identityHashCode is default (not overrided) function

answered Sep 15, 2014 at 8:35

Payne

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