What is System identityHashCode() function in Java?

From the java.lang.* package, the identityHashCode() function returns the hash code regarding a defined object (argument value). This hash code is returned through the default function hashCode().

Syntax

static int identityHashCode(Object x)

Parameters

It takes an argument of Object type.

  • x: This represents the object for which the hash code will be calculated.

Return value

  • This method will return the hash code.
  • If the hash code is null, then a zero value will be returned as a reference.

Example

The code to learn about the working of identityHashCode() is as follows.

// Loaad necessary libraries
import java.lang.*;
import java.io.*;
public class EdPresso {
   public static void main(String[] args) throws Exception {
      // objects of File type
      File f1 = new File("Ali");
      File f2 = new File("Hamza");
      File f3 = new File("Mohsin");
      // returning the HashCode
      int hashCode1 = System.identityHashCode(f1);
      System.out.println(hashCode1);
      // returning the different HashCode regarding similar filename
      int hashCode2 = System.identityHashCode(f2);
      System.out.println(hashCode2);
      // returning the HashCode    
      int hashCode3 = System.identityHashCode(f3);
      System.out.println(hashCode3);
   }
}
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