Java ConcurrentLinkedQueue removeAll() Method

The removeAll() method of ConcurrentLinkedQueue class is used to remove the elements of the ConcurrentLinkedQueue that are matched with the items of the specified collection.

Syntax:

Parameters:

Here, the parameter c is the collection containing elements to be removed from ConcurrentLinkedQueue.

Specified By:

The removeAll () method of ConcurrentLinkedQueue class is specified by:

removeAll in interface Collection<E>.

Return Value:

The removeAll () method returns a Boolean value 'true' if the collection is changed otherwise it returns false.

Throws:

It throws NullPointerException if the specified collection does not support null elements or it contains one or more null elements.

Example 1

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueRemoveAllExample1 {
    public static void main(String[] args) {
        ConcurrentLinkedQueue<Character> queue = new ConcurrentLinkedQueue<Character>();
        char c;
        for(c='A';c<='Z';++c){
            queue.add(c);
        }
        System.out.println("Queue : "+queue);
        List<Character> list = new ArrayList<Character>();
        list.add('A');
        list.add('E');
        list.add('I');
        list.add('O');
        list.add('U');
        System.out.println("List of vowels : "+list);
        //removes all the elements int the queue which are present in list
        queue.removeAll(list);
        System.out.println("Queue without vowels : "+queue);
    }
}

Test it Now

Output:

Queue : [A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z]
List of vowels : [A, E, I, O, U]
Queue without vowels : [B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z]

Example 2

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueRemoveAllExample2 {
    public static void main(String[] args) {
        ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();
        List<Integer> list = new ArrayList<Integer>();
        for (int i=1;i<11;i++){
            queue.add(i);}
        System.out.println("Total no : "+ queue);
        for (int i=1;i<11;i++){
            i=i+1;
            list.add(i);}
        //removes all the elements int the queue which are present in list
        queue.removeAll(list);
        System.out.println(" Even no : "+list);
        System.out.println(" Odd no : "+queue);
    }
}

Test it Now

Output:

Total no : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 Even no : [2, 4, 6, 8, 10]
 Odd no : [1, 3, 5, 7, 9]

Example 3

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueRemoveAllExample3 {
    public static void main(String[] args) {
        ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();
        List<Integer> list = new ArrayList<Integer>();
        queue.add(67);
        queue.add(100);
        queue.add(null);
        list.add(67);
        queue.removeAll(list);
        System.out.println("Queue : "+queue);
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.util.concurrent.ConcurrentLinkedQueue.checkNotNull(ConcurrentLinkedQueue.java:920)
	at java.util.concurrent.ConcurrentLinkedQueue.offer(ConcurrentLinkedQueue.java:327)
	at java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:297)
	at com.javaTpoint.ConcurrentLinkedQueueRemoveAllExample3.main(ConcurrentLinkedQueueRemoveAllExample3.java:12)

Next TopicJava ConcurrentLinkedQueue

← prev next →