Java Long class

Java IdentityHashMap hashCode() method

Last Updated : 17 Mar 2025

The hashCode() method of the Java IdentityHashMap is used to get the hashCode value of the calling IdentityHashMap.

Syntax

Return

The hashCode value for the calling IdentityHashMap.

Example 1

 import java.util.IdentityHashMap;

public class IdentityHashMapHashCodeExample1 {
    public static void main(String[] args) {
   //Creating an object of IdentityHashMap class
   IdentityHashMap<String,Integer> map = new IdentityHashMap<String,Integer>(6);
   
   //Putting key-value pairs inside map
   map.put("Java", 1);
   map.put("is", 2);
   map.put("the", 3);
   map.put("best", 4);
   map.put("programming", 5);
   map.put("language", 6);
   
   //Getting HashCode value for this IdentityHashMap
   System.out.println(map.hashCode());
}
}

Output:

1026056478

Example 2

import java.util.IdentityHashMap;

class Student{
    private int roll;
    private String name;
    private int standard;
    
    public Student(int roll,String name,int standard){
        this.roll = roll;
        this.name = name;
        this.standard = standard;
    }
    
    public String disp(){
        return roll+" "+name+" "+standard;
    }
}

public class IdentityHashMapHashCodeExample2 {
    public static void main(String[] args) {
        
        //Creating Objects of Student class
        Student stud1 = new Student(1 ,"Ram ",10);
        Student stud2 = new Student(2 ,"Shyam ",10);
        Student stud3 = new Student(3 ,"Aman ",12);
        Student stud4 = new Student(4 ,"Harsh ",12);
        Student stud5 = new Student(5 ,"Shivam",11);
        
        //Creating an instance of IdentityHashMap
        IdentityHashMap<Integer,Student> map = new IdentityHashMap<Integer,Student>(5);
                
        //Inserting the Student class objects into IdentityHashMap
        map.put(1,stud1);
        map.put(2,stud2);
        map.put(3,stud3);
        map.put(4,stud4);        
        //Getting hashCode value for this IdentityHashMap
        System.out.println(map.hashCode());
}
}

Output:

-1317024690

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Java IdentityHashMap hashCode() method

Syntax

Return

Example 1

Example 2

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