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Showing content from https://www.geeksforgeeks.org/java/concurrentskiplistset-clear-method-in-java/ below:

ConcurrentSkipListSet clear() method in Java

ConcurrentSkipListSet clear() method in Java

Last Updated : 17 Sep, 2018

The

java.util.concurrent.ConcurrentSkipListSet.clear()

method is an in-built function in Java which removes all the elements from this set.

Syntax:
 ConcurrentSkipListSet.clear()
Parameters:

The function does not accept any parameter.

Return Value:

The function does not return anything. Below programs illustrate the ConcurrentSkipListSet.clear() method:

Program 1: Java
/* Java Program Demonstrate clear()
method of ConcurrentSkipListSet() */
import java.util.concurrent.*;
class ConcurrentSkipListSetClearExample1 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<Integer> Lset = 
                   new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 50; i += 10)
            Lset.add(i);

        // Printing elements of the set
        System.out.println("The set contains: " + Lset);

        // Clear the set
        Lset.clear();

        // Printing elements of the set after clear operation
        System.out.println("After clear operation the set contains: " 
                                                             + Lset);
    }
}
Output:
The set contains: [10, 20, 30, 40, 50]
After clear operation the set contains: []
Program 2: Java
/* Java Program Demonstrate clear()
method of ConcurrentSkipListSet() */
import java.util.concurrent.*;
class ConcurrentSkipListSetClearExample2 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<String> Lset = 
                    new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        Lset.add("alex");
        Lset.add("bob");
        Lset.add("chuck");
        Lset.add("drake");
        Lset.add("eric");

        // Printing elements of the set
        System.out.println("The set contains: " + Lset);

        // Clear the set
        Lset.clear();

        // Printing elements of the set after clear operation
        System.out.println("After clear operation the set contains: " 
                                                              + Lset);
    }
}
Output:
The set contains: [alex, bob, chuck, drake, eric]
After clear operation the set contains: []
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#clear--

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