The containsValue() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns true if this map maps one or more keys to the specified value. The method returns null if there is no key to be mapped. The method throws NullPointerException when the specified value is null.
Syntax:
public boolean containsValue(Object ob)
Parameter: The function accepts a single mandatory parameter ob which specifies the value whose presence is to be tested.
Return Value: The function returns true if mapping exists or else returns false.
Exception: The method throws NullPointerException when the specified value is null.
Below programs illustrate the above method:
Program 1:
Java
// Java Program Demonstrate containsValue()// method of ConcurrentSkipListMapimport java.util.concurrent.*;class GFG { public static void main(String[] args) { // Initializing the map ConcurrentSkipListMap<Integer, Integer> mpp = new ConcurrentSkipListMap<Integer, Integer>(); // Adding elements to this map for (int i = 1; i <= 5; i++) mpp.put(i, i); // checking whether object present in map System.out.println(mpp.containsValue(4)); }} |
Output:
true
Program :
Java
// Java Program Demonstrate containsValue()// method of ConcurrentSkipListMapimport java.util.concurrent.*;class GFG { public static void main(String[] args) { // Initializing the map ConcurrentSkipListMap<Integer, Integer> mpp = new ConcurrentSkipListMap<Integer, Integer>(); // Adding elements to this map for (int i = 1; i <= 5; i++) mpp.put(i, i); // checking whether object present in map System.out.println(mpp.containsValue(7)); }} |
Output:
false
