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....
本例是 above-described 程序的解决方案。 importjava.util.Collection;importjava.util.concurrent.ConcurrentLinkedQueue;publicclassJavaCollectionToArrayExample3{publicstaticvoidmain(String[] args){ Collection<Integer>collection=newConcurrentLinkedQueue(); System.out.println("List of even numbers in our collecti...
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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.JavaCollectionRemoveAllExample3.mai...
Exception in thread "main" java.lang.NullPointerException at java.util.Objects.requireNonNull(Objects.java:203) at java.util.AbstractCollection.retainAll(AbstractCollection.java:405) at com.javaTpoint.JavaCollectionRetainAllExample4.main(JavaCollectionRetainAllExample4.java:17) ...
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)...