The iterator () method returns an iterator over the elements in this collection. Example 1 importjava.util.Collection; importjava.util.Iterator; importjava.util.concurrent.ConcurrentLinkedQueue; publicclassJavaCollectionIteratorExample1 { staticinti =1; ...
Exception in thread "main" java.lang.NullPointerException at java.util.ArrayDeque.addLast(ArrayDeque.java:249) at java.util.ArrayDeque.add(ArrayDeque.java:423) at com.javaTpoint.JavaCollectionContainsAllExample2.main(JavaCollectionContainsAllExample2.java:13) Example 3 importjava.util.ArrayDeque; import...
输出: Exception in thread "main" java.lang.NullPointerException at java.util.ArrayDeque.addLast(ArrayDeque.java:249) at java.util.ArrayDeque.add(ArrayDeque.java:423) at com.javaTpoint.JavaCollectionRemoveExample3.main(JavaCollectionRemoveExample3.java:13)...
set.add(45); System.out.print("The elements in Collection : "); System.out.println(set); } } Test it Now Output: Exception in thread "main" java.lang.NullPointerException at java.util.concurrent.ConcurrentLinkedQueue.checkNotNull(ConcurrentLinkedQueue.java:920) at java.util.concurrent.Concur...
In this example, we are taking the example of Forum where One question can have multiple answers. There are three pages: Question.java applicationContext.xml Test.java In this example, we are using list that can have duplicate elements, you may use set that have only unique elements. But,...
step is to use a loop to add more nodes to the linked list, assigning each node's value to the loop countervariable iand its next pointer to the node after it in the list. In order to signal the list's end, we finally set the next pointer of the last node in the list toNUL...
import java.util.Collection; import java.util.concurrent.LinkedBlockingDeque; public class JavaCollectionClearExample1 { public static void main(String[] args) { Collection<Integer> collection = new LinkedBlockingDeque<Integer>(); collection.add(23); collection.add(123); collection.add(56); System...
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Exception in thread "main" java.lang.NullPointerException at java.util.concurrent.ConcurrentLinkedQueue.toArray(ConcurrentLinkedQueue.java:638) at com.javaTpoint.JavaCollectionToArrayExample4.main(JavaCollectionToArrayExample4.java:12) Next Topic...