TreeMap containsValue() Method in Java With Examples

In Java, containsValue() method of the TreeMap class is used to check whether a particular value is being mapped by any key in the TreeMap. It takes the value as a parameter and returns True if that value is mapped by any of the keys in the map.

--> java.util Package 
    --> TreeMap class
        --> containsValue() Method  

Syntax:

Tree_Map.containsValue(Object Value)

Parameters: The value of Object type and refers to the value whose mapping is supposed to be checked by any key inside the map. ( Only one parameter)

Return Type: A boolean value, true if the mapping of the value is detected else false.

Note: In java, while returning boolean values are returned as true false only not as 0 and 1 as it is not allowed so do will throw error at compilation.

Example 1: Mapping String Values to Integer Keys. 

Java

// Java Program to Illustrate containsValue() 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 and 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);

        // Checking for custom value in map
        // using containsValue() method

        // Say for the Value 'Geeks'
        System.out.println(
            "Is the value 'Geeks' present? "
            + tree_map.containsValue("Geeks"));

        // Checking for the Value 'World'
        System.out.println(
            "Is the value 'World' present? "
            + tree_map.containsValue("World"));
    }
}

Output

Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
Is the value 'Geeks' present? true
Is the value 'World' present? false

Example 2: Mapping Integer Values to String Keys. 

Java

// Java Program  to illustrate containsValue() 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);
        hastree_map_map.put("You", 30);

        // Printing the elements of TreeMap
        System.out.println("Initial Mappings are: "
                           + tree_map);

        // Checking for the Value '10'
        // using containsValue() method
        System.out.println("Is the value '10' present? "
                           + tree_map.containsValue(10));

        // Checking for the Value '30'
        System.out.println("Is the value '30' present? "
                           + tree_map.containsValue(30));

        // Checking for the Value '40'
        System.out.println("Is the value '40' present? "
                           + tree_map.containsValue(40));
    }
}

Output:

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