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Java WeakHashMap values() Method with Example

WeakHashMap Class values() method: Here, we are going to learn about the values() method of WeakHashMap Class with its syntax and example.
Submitted by Preeti Jain, on February 23, 2020

WeakHashMap Class values() method

  • values() method is available in java.util package.
  • values() method is used to get the values that exist in this map to be viewed in a collection.
  • values() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • values() method does not throw an exception at the time of viewing the object in a collection.


    public Collection values();


  • It does not accept any parameter.

Return value:

The return type of the method is Collection, it gets collection view of the values exists in this map.


// Java program to demonstrate the example 
// of Collection values() method of WeakHashMap 

import java.util.*;

public class ValuesOfWeakHashMap {
    public static void main(String[] args) {
        // Instantiates a WeakHashMap object
        Map < Integer, String > map = new WeakHashMap < Integer, String > ();

        // By using put() method is to add
        // key-value pairs in a WeakHashMap
        map.put(10, "C");
        map.put(20, "C++");
        map.put(50, "JAVA");
        map.put(40, "PHP");
        map.put(30, "SFDC");

        // Display WeakHashMap
        System.out.println("WeakHashMap: " + map);

        // By using values() method is to return
        // the values exists in this WeakHashMap
        // to be viewed in a collection
        Collection co = map.values();

        // Display collection
        System.out.print("map.values(): " + co);


WeakHashMap: {30=SFDC, 40=PHP, 10=C, 20=C++, 50=JAVA}
map.values(): [SFDC, PHP, C, C++, JAVA]


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