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, "Beginner"); 
        abs_map.put(15, "4"); 
        abs_map.put(20, "Beginner"); 
        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 'Beginner' 
        System.out.println("Is the value"
                           + " 'Beginner' present? "
                           + abs_map.containsValue("Beginner")); 
  
        // Checking for the Value 'World' 
        System.out.println("Is the value"
                           + " 'World' present? "
                           + abs_map.containsValue("World")); 
    } 
} 

Output:

Initial Mappings are: {20=Beginner, 25=Welcomes, 10=Beginner, 30=You, 15=4}
Is the value 'Beginner' 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("Beginner", 10); 
        abs_map.put("4", 15); 
        abs_map.put("Beginner", 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, Beginner=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.

AbstractMap containsValue() Method in Java with Examples

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