Online Java Compiler By
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import java.util.ArrayDeque; import java.util.Deque; import java.util.concurrent.ConcurrentLinkedQueue; public class JavaCollectionAddAllExample3 { public static void main(String[] args) { ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>(); Deque<Integer> deque=new ArrayDeque<>(); for (int i=0;i<=5;i++){ queue.add(i); } //will give an error for null elements deque.add(null); queue.addAll(deque); System.out.println(queue); } }
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