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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) 例子3 importjava.util.ArrayDeque;importjava....
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)...
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...
at java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:297) at com.javaTpoint.JavaCollectionAddExample4.main(JavaCollectionAddExample4.java:13) If any of the specified element in this queue is null, it will give NullPointerException as described above....
输出: Exception in thread "main" java.lang.NullPointerException at java.util.concurrent.ConcurrentLinkedQueue.toArray(ConcurrentLinkedQueue.java:638) at com.javaTpoint.JavaCollectionToArrayExample4.main(JavaCollectionToArrayExample4.java:12) 相关...
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...
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; ...
at java.util.concurrent.ConcurrentLinkedQueue.offer(ConcurrentLinkedQueue.java:327) at java.util.concurrent.ConcurrentLinkedQueue.add(ConcurrentLinkedQueue.java:297) at com.javaTpoint.JavaCollectionRemoveAllExample3.main(JavaCollectionRemoveAllExample3.java:13)...
The contains() method of Java Collection Interface returns a Boolean value 'true', if it contains the specified element in the collection. Syntax publicbooleancontainsAll(Object o) Parameters The parameter 'o' represents the element whose occurrence in this collection is to be tested. ...