Java IdentityHashMap containsValue() method

The containsValue(Object value) method of the Java IdentityHashMap class is used to check whether the calling IdentityHashMap contains the specified value.

Syntax

Parameters

Value - The possible value which is to be checked in the calling IdentityHashMap.

Return

True, if the calling IdentityHashMap contains the specified value.

Example 1

import java.util.IdentityHashMap;

public class IdentityHashMapContainsValueExample1 {
    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
   int i1 = 1;
   double i2 = 1.0;
   int i3 = 4;
   int i4 = 8;
   
   //Checking if the specified key is present in the callinh IdentityHashMap
   System.out.println(map.containsValue(i1));
   System.out.println(map.containsValue(i2));
   System.out.println(map.containsValue(i3));
   System.out.println(map.containsValue(i4));
}
}

Test it Now

Output:

true
false
true
false

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 IdentityHashMapContainsValueExample2 {
    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
        System.out.println(map.put(1,stud1));
        System.out.println(map.put(2,stud2));
        System.out.println(map.put(3,stud3));
        System.out.println(map.put(4,stud4));
        
        //Using containsValue() method
        System.out.println(map.containsValue(stud1));
        System.out.println(map.containsValue("Random"));
        System.out.println(map.containsValue(stud4));
        System.out.println(map.containsValue(stud5));
}
}

Test it Now

Output:

true
false
true
false

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