Java IdentityHashMap get() method

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"));
   
}
}

Test it Now

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));

}
}

Test it Now

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));
}
}

Test it Now

Output:

Student@70dea4e
Student@5c647e05
Student@33909752
null

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