AbstractMap containsValue() Method in Java with Examples

The containsValue() method of the AbstractMap is used to check whether a particular value is being mapped by a single or more than one key in the AbstractMap. It takes the Value as a parameter and returns True if that value is mapped by any of the keys in the map.

Syntax:

AbstractMap.containsValue(Object Value)

Parameters: The method takes just one parameter Value of Object type and refers to the value whose mapping is supposed to be checked by any key inside the map.

Return Value: The method returns boolean true if the mapping of the value is detected else false.

Below programs are used to illustrate the working of AbstractMap.containsValue() Method:

Program 1: Mapping String Values to Integer Keys.

// Java code to illustrate
// the containsValue() method

import java.util.*;

public class Abstract_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractMap
        AbstractMap<Integer, String>
            abs_map = new HashMap<Integer, String>();

        // Mapping string values to int keys
        abs_map.put(10, "Geeks");
        abs_map.put(15, "4");
        abs_map.put(20, "Geeks");
        abs_map.put(25, "Welcomes");
        abs_map.put(30, "You");

        // Displaying the AbstractMap
        System.out.println("Initial Mappings are: "
                           + abs_map);

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

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

Output:

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

Program 2: Mapping Integer Values to String Keys.

// Java code to illustrate
// the containsValue() method

import java.util.*;

public class Abstract_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty AbstractMap
        AbstractMap<String, Integer>
            abs_map = new HashMap<String, Integer>();

        // Mapping int values to string keys
        abs_map.put("Geeks", 10);
        abs_map.put("4", 15);
        abs_map.put("Geeks", 20);
        abs_map.put("Welcomes", 25);
        abs_map.put("You", 30);

        // Displaying the AbstractMap
        System.out.println("Initial Mappings are: "
                           + abs_map);

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

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

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

Output:

Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
Is the value '10' present? false
Is the value '30' present? true
Is the value '40' present? false

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