The contains() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns a true boolean value if the specified element is present in this set otherwise it returns false.
Syntax:
ConcurrentSkipListSet.contains(Object o)
Parameters: The function accepts a single parameter o i.e. to be checked for the presence in this set.
Return Value: The function returns a Boolean value. It returns True if the specified element is present in this set else it returns False.
Below programs illustrate the ConcurrentSkipListSet.contains() method:
Program 1:
// Java Program Demonstrate contains()// method of ConcurrentSkipListSet  import java.util.concurrent.*;  class ConcurrentSkipListSetContainsExample1 {    public static void main(String[] args)    {          // Initializing the set        ConcurrentSkipListSet<Integer>            set = new ConcurrentSkipListSet<Integer>();          // Adding elements to this set        for (int i = 10; i <= 15; i++)            set.add(i);          // Checks if 9 is present in the set        if (set.contains(9))            System.out.println("9 is present in the set.");        else            System.out.println("9 is not present in the set.");    }} |
Output:
9 is not present in the set.
Program 2:
// Java Program Demonstrate contains()// method of ConcurrentSkipListSet */  import java.util.concurrent.*;  class ConcurrentSkipListSetContainsExample2 {    public static void main(String[] args)    {          // Initializing the set        ConcurrentSkipListSet<String>            set = new ConcurrentSkipListSet<String>();          // Adding elements to this set        set.add("Gfg");        set.add("is");        set.add("fun");          // Checks if Gfg is present in the set        if (set.contains("Gfg"))            System.out.println("Gfg is present in the set.");        else            System.out.println("Gfg is not present in the set.");    }} |
Output:
Gfg is present in the set.
