The containsKey() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns a true boolean value if the specified element is present in this map otherwise it returns false.
Syntax:
public boolean containsKey(Object ob)
Parameter: The function accepts a single mandatory parameter ob which specifies the key whose presence in this map is to be tested.
Return Value: The function returns true if this map contains a mapping for the specified key.
Below programs illustrate the above method:
Program 1:
// Java Program Demonstrate containsKey()// method of ConcurrentSkipListMap import 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); // Checks if 9 is present in the map if (mpp.containsKey(9)) System.out.println("9 is present" + " in the mpp."); else System.out.println("9 is not present" + " in the mpp."); }} |
Program 2:
// Java Program Demonstrate containsKey()// method of ConcurrentSkipListMap import 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); // Checks if 4 is present in the map if (mpp.containsKey(4)) System.out.println("4 is present" + " in the mpp."); else System.out.println("4 is not present" + " in the mpp."); }} |
