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import java.util.Collection; import java.util.concurrent.ConcurrentLinkedQueue; public class JavaCollectionIsEmptyExample2 { public static void main(String[] args) { Collection<Integer> collection = new ConcurrentLinkedQueue<Integer>(); //returns an exception for null element collection.add(null); //returns true if the queue is empty if(collection.isEmpty()){ System.out.println("Add some elements because the queue is empty."); } else{ System.out.println("Elements are : "+collection); } } }
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