The containsValue() method is used to check whether a particular value is being mapped by a single or more than one key in the SortedMap. It takes the value as a parameter and returns True if that value is mapped by any of the keys 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.
Note: The containsValue() method in SortedMap is inherited from the Map interface in Java.
Below programs illustrate the containsValue() method:
Program 1: Mapping String Values to Integer Keys.
Java
// Java code to illustrate// the containsValue() methodimport java.util.*;public class Map_Demo { public static void main(String[] args) { // Creating an empty SortedMap SortedMap<Integer, String> map = new TreeMap<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 SortedMap 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")); }} |
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
Program 2: Mapping Integer Values to String Keys.
Java
// Java code to illustrate// the containsValue() methodimport java.util.*;public class Map_Demo { public static void main(String[] args) { // Creating an empty SortedMap SortedMap<String, Integer> map = new TreeMap<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 SortedMap 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)); }} |
Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30}
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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