WeakHashMap values() Method in Java
Last Updated :
20 Jul, 2018
The java.util.WeakHashMap.values() method of HashMap class in Java is used to create a collection out of the values of the map. It basically returns a Collection view of the values in the Map.
Syntax:
Weak_Hash_Map.values()
Parameters: The method does not accept any parameters.
Return Value: The method is used to return a collection view containing all the values of the map.
Below programs are used to illustrate the working of java.util.WeakHashMap.values() Method:
Program 1:
import java.util.*;
public class Weak_Hash_Map_Demo {
public static void main(String[] args)
{
Map<Integer, String> weak_hash = new
WeakHashMap<Integer, String>();
weak_hash.put(10, "Geeks");
weak_hash.put(15, "4");
weak_hash.put(20, "Geeks");
weak_hash.put(25, "Welcomes");
weak_hash.put(30, "You");
System.out.println("Initial Mappings are: " +
weak_hash);
System.out.println("The collection is: " +
weak_hash.values());
}
}
|
Output:
Initial Mappings are: {30=You, 15=4, 10=Geeks, 25=Welcomes, 20=Geeks}
The collection is: [You, 4, Geeks, Welcomes, Geeks]
Program 2:
import java.util.*;
public class Weak_Hash_Map_Demo {
public static void main(String[] args)
{
Map<String, Integer> weak_hash = new
WeakHashMap<String, Integer>();
weak_hash.put("Geeks", 10);
weak_hash.put("4", 15);
weak_hash.put("Geeks", 20);
weak_hash.put("Welcomes", 25);
weak_hash.put("You", 30);
System.out.println("Initial Mappings are: " +
weak_hash);
System.out.println("The collection is: " +
weak_hash.values());
}
}
|
Output:
Initial Mappings are: {Welcomes=25, 4=15, You=30, Geeks=20}
The collection is: [25, 15, 30, 20]
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
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