Java IdentityHashMap get() method

Last Updated : 17 Mar 2025

The get(Object key) method of the Java IdentityHashMap is used to get the value which is linked with the specified key, in the calling IdentityHashMap or null, if the key is not linked with any value.

Syntax

Parameters

key - The key whose linked value is to be found.

Return

The value which is linked with the specified key or null, if the key is not connected with any value.

Example 1

import java.util.IdentityHashMap;

public class IdentityHashMapGetExample1 {
    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);
   
   //Creating an object of Object class, to be used as key
   Object obj = new Object();
   obj = "Java";
   
   //Getting the value of the specified key
   System.out.println(map.get(obj));
   System.out.println(map.get("best"));
   System.out.println(map.get("Object"));
   
}
}

Output:

1
4
null

Example 2

import java.util.IdentityHashMap;

public class IdentityHashMapGetExample2 {
    public static void main(String[] args) {
   //Creating an object of IdentityHashMap class
   IdentityHashMap<Integer,String> map = new IdentityHashMap<Integer,String>(6);
   
   //Putting key-value pairs inside map
   map.put(1, "Java");
   map.put(2, "is");
   map.put(3, "the");
   map.put(4, "best");
   map.put(5, "programming");
   map.put(6, "language");
   
   //Creating an object of Object class, to be used as key
   Object obj = new Object();
   obj = 1;
   
   //Getting the value of the specified key
   System.out.println(map.get(obj));
   System.out.println(map.get(4));
   System.out.println(map.get(8));

}
}

Output:

Java
best
null

Example 3

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 IdentityHashMapGetExample3 {
    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 the value linked with the specified key
        System.out.println(map.get(1));
        System.out.println(map.get(2));
        System.out.println(map.get(4));
        System.out.println(map.get(5));
}
}

Output:

[email protected]
[email protected]
[email protected]
null

Next TopicJava-identityhashmap-equals-method

← prev next →

We deliver comprehensive tutorials, interview question-answers, MCQs, study materials on leading programming languages and web technologies like Data Science, MEAN/MERN full stack development, Python, Java, C++, C, HTML, React, Angular, PHP and much more to support your learning and career growth.

Contact info

G-13, 2nd Floor, Sec-3, Noida, UP, 201301, India

hr@tpointtech.com

+91-9599086977

Interview Questions

Python Java Data Structure C++ C HTML JavaScript jQuery SQL Power BI

Online Compilers

C Compiler R Compiler C++ Compiler PHP Compiler Java Compiler HTML Editor Swift Compiler Python Compiler JavaScript Editor TypeScript Editor

Latest Post | Tutorials List | Privacy Policy | About Us | Contact Us

Java IdentityHashMap get() method

Syntax

Parameters

Return

Example 1

Example 2

Example 3

Contact info

Follow us

Top Tutorials

Interview Questions

Online Compilers

Java String Methods

Java Array Class

Java Math Methods

ArrayList Methods

Java List Methods

Java Thread Methods

Java Date Class

Java Collection Methods

Java ListIterator Class

Java NIO Tutorial

HttpURLConnection

Java Deque

Java HttpCookie Class

Java URL class

Java Vector class

Java Socket Class

Java Executors

Java Integer Class