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." ); } } |