Map containsValue() method in Java with Examples

Last Updated : 31 Dec, 2018

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

Syntax:

boolean 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 illustrate the java.util.Map.containsValue() method:

Program 1: Mapping String Values to Integer Keys.

// Java code to illustrate the containsValue() method 
  
import java.util.*; 
  
public class Map_Demo { 
    public static void main(String[] args) 
    { 
        // Creating an empty Map 
        Map<Integer, String> map = new HashMap<Integer, String>(); 
  
        // Mapping string values to int keys 
        map.put(10, "Geeks"); 
        map.put(15, "4"); 
        map.put(20, "Geeks"); 
        map.put(25, "Welcomes"); 
        map.put(30, "You"); 
  
        // Displaying the Map 
        System.out.println("Initial Mappings are: " + map); 
  
        // Checking for the Value 'Geeks' 
        System.out.println("Is the value 'Geeks' present? " + map.containsValue("Geeks")); 
  
        // Checking for the Value 'World' 
        System.out.println("Is the value 'World' present? " + 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 Map_Demo { 
    public static void main(String[] args) 
    { 
        // Creating an empty Map 
        Map<String, Integer> map = new HashMap<String, Integer>(); 
  
        // Mapping int values to string keys 
        map.put("Geeks", 10); 
        map.put("4", 15); 
        map.put("Geeks", 20); 
        map.put("Welcomes", 25); 
        map.put("You", 30); 
  
        // Displaying the Map 
        System.out.println("Initial Mappings are: " + map); 
  
        // Checking for the Value '10' 
        System.out.println("Is the value '10' present? " + map.containsValue(10)); 
  
        // Checking for the Value '30' 
        System.out.println("Is the value '30' present? " + map.containsValue(30)); 
  
        // Checking for the Value '40' 
        System.out.println("Is the value '40' present? " + 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.

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#containsValue(java.lang.Object)

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