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TreeMap values() Method in Java

  • Last Updated : 10 Jul, 2018

The java.util.TreeMap.values() method of TreeMap 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 TreeMap.

Syntax:

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Tree_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.TreeMap.values() Method:
Program 1: Mapping String Values to Integer Keys.




// Java code to illustrate the values() method
import java.util.*;
  
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<Integer, String> tree_map = new TreeMap<Integer, String>();
  
        // Mapping string values to int keys
        tree_map.put(10, "Geeks");
        tree_map.put(15, "4");
        tree_map.put(20, "Geeks");
        tree_map.put(25, "Welcomes");
        tree_map.put(30, "You");
  
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
  
        // Using values() to get the set view of values
        System.out.println("The collection is: " + tree_map.values());
    }
}
Output:
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
The collection is: [Geeks, 4, Geeks, Welcomes, You]

Program 2: Mapping Integer Values to String Keys.




// Java code to illustrate the values() method
import java.util.*;
  
public class Tree_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<String, Integer> tree_map = new TreeMap<String, Integer>();
  
        // Mapping int values to string keys
        tree_map.put("Geeks", 10);
        tree_map.put("4", 15);
        tree_map.put("Geeks", 20);
        tree_map.put("Welcomes", 25);
        tree_map.put("You", 30);
  
        // Displaying the TreeMap
        System.out.println("Initial Mappings are: " + tree_map);
  
        // Using values() to get the set view of values
        System.out.println("The collection is: " + tree_map.values());
    }
}
Output:
Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30}
The collection is: [15, 20, 25, 30]

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.




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