Java.lang.System.identityHashCode() Method

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Description

The java.lang.System.identityHashCode() method returns the same hash code for the given object as would be returned by the default method hashCode(). The hash code for the null reference is zero.

Declaration

Following is the declaration for java.lang.System.identityHashCode() method

public static int identityHashCode(Object x)

Parameters

x − This is the object for which the hashCode is to be calculated.

Return Value

This method returns the hashCode.

Exception

NA

Example

The following example shows the usage of java.lang.System.identityHashCode() method.

package com.tutorialspoint;

import java.lang.*;
import java.io.*;

public class SystemDemo {

   public static void main(String[] args) throws Exception {

      File file1 = new File("amit");
      File file2 = new File("amit");
      File file3 = new File("ansh");

      // returns the HashCode
      int ret1 = System.identityHashCode(file1);
      System.out.println(ret1);

      // returns different HashCode for same filename
      int ret2 = System.identityHashCode(file2);
      System.out.println(ret2);

      // returns the HashCode    
      int ret3 = System.identityHashCode(file3);
      System.out.println(ret3);
   }
} 

Let us compile and run the above program, this will produce the following result −

355165777
1414159026
1569228633