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")); }} |
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)); }} |
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.