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TreeMap values() Method in Java with Examples

  • Last Updated : 18 Nov, 2021

In Java, the values() method of the TreeMap class is present inside java.util package which 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.

--> java.util package
    --> TreeMap class
        --> values() Method  

Syntax: 

Tree_Map.values()

Return Type: A collection view containing all the values of the map.

Now we will be proposing different sets to illustrate values() method as listed:

  1. Mapping string values to integer keys
  2. Mapping integer values to string keys

Example 1: Mapping String Values to Integer Keys

Java




// Java Program to illustrate values() Method
// of TreeMap class
 
// Importing required classes
import java.util.*;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
        // Creating an empty TreeMap by
        // declaring object of integer, string pairs
        TreeMap<Integer, String> tree_map
            = new TreeMap<Integer, String>();
 
        // Mapping string values to int keys
        // using put() method
        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");
 
        // Printing the elements of TreeMap
        System.out.println("Initial Mappings are: "
                           + tree_map);
 
        // Getting the set view of values
        // using values() method
        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]

 

Example 2: Mapping Integer Values to String Keys. 

Java




// Java Program to Illustrate values() method
// of TreeMap class
 
// Importing required classes
import java.util.*;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
        // Creating an empty TreeMap by
        // declaring object of string, integer pairs
        TreeMap<String, Integer> tree_map
            = new TreeMap<String, Integer>();
 
        // Mapping int values to string keys
        // using put() method
        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);
 
        // Printing the elements of TreeMap
        System.out.println("Initial Mappings are: "
                           + tree_map);
 
        // Getting the set view of values
        // using values() method
        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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