Check for the existence of a value in Java IdentityHashMap

Use the containsValue() method to check whether a particular value exists in IdentityHashMap or not.

Create a IdentityHashMap

Map<String, Integer> m = newIdentityHashMap<String, Integer>();
m.put("1", 100);
m.put("2", 200);
m.put("3", 300);
m.put("4", 150);
m.put("5", 110);
m.put("6", 50);
m.put("7", 90);
m.put("8", 250);
m.put("9", 350);
m.put("10", 450);

Now, let’s say we need to check whether value 100 exists or not. For that, use the containsValue() method like this

m.containsValue(100)

The following is an example to check for the existence of a value in IdentityHashMap

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      Map<String, Integer> m = newIdentityHashMap<String, Integer>();
      m.put("1", 100);
      m.put("2", 200);
      m.put("3", 300);
      m.put("4", 150);
      m.put("5", 110);
      m.put("6", 50);
      m.put("7", 90);
      m.put("8", 250);
      m.put("9", 350);
      m.put("10", 450);
      System.out.println("IdentityHashMap elements\n"+ m);
      System.out.println("Is value 100 in the Map? " + m.containsValue(100));
   }
}

Output

IdentityHashMap elements
{2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300}
Is value 100 in the Map? True

Chandu yadav

Updated on 30-Jul-2019 22:30:24

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