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

ConcurrentSkipListSet removeAll() method in Java

Last Updated : 26 Nov, 2018

The

removeAll()

method of

java.util.concurrent.ConcurrentSkipListSet

is an in-built function in Java which returns removes from this set all of its elements that are contained in the specified collection. If the specified collection is also a set, this operation effectively modifies this set so that its value is the asymmetric set difference of the two sets.

Syntax:

public boolean removeAll(Collection c)

Parameter:

The function accepts a single parameter

c Return Value:

The function returns true if this set changed as a result of the call.

Exception:

The function throws the following exceptions:

ClassCastException - if the types of one or more elements in this set are incompatible with the specified collection

NullPointerException - if the specified collection or any of its elements are null

Below programs illustrate the ConcurrentSkipListSet.removeAll() method:

Program 1: Java


 // Java program to demonstrate removeAll()
// method of ConcurrentSkipListSet

import java.util.concurrent.*;
import java.util.ArrayList;
import java.util.List;

class ConcurrentSkipListSetremoveAllExample1 {
    public static void main(String[] args)
    {

        // Initializing the List
        List<Integer> list = new ArrayList<Integer>();

        // Adding elements in the list
        for (int i = 1; i <= 10; i += 2)
            list.add(i);

        // Contents of the list
        System.out.println("Contents of the list: " + list);

        // Initializing the set
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();

        // Adding elements in the set
        for (int i = 1; i <= 10; i++)
            set.add(i);

        // Contents of the set
        System.out.println("Contents of the set: " + set);

        // Remove all elements from the set which are in the list
        set.removeAll(list);

        // Contents of the set after removal
        System.out.println("Contents of the set after removal: "
                           + set);
    }
}

Output:

Contents of the list: [1, 3, 5, 7, 9]
Contents of the set: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Contents of the set after removal: [2, 4, 6, 8, 10]

Program 2:

Program to show NullPOinterException in removeAll().

Java


 // Java program to demonstrate removeAll()
// method of ConcurrentSkipListSet

import java.util.concurrent.*;
import java.util.ArrayList;
import java.util.List;

class ConcurrentSkipListSetremoveAllExample1 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();

        // Adding elements in the set
        for (int i = 1; i <= 10; i++)
            set.add(i);

        // Contents of the set
        System.out.println("Contents of the set: " + set);

        try {
            // Remove all elements from the set which are null
            set.removeAll(null);
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

Output:

Contents of the set: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Exception: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#removeAll-java.util.Collection-

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