接口Collection<E> 中的 removeAll。 返回值: 如果集合发生更改,removeAll() 方法将返回一个布尔值 'true',否则返回 false。 抛出: 如果指定的集合不支持空元素或包含一个或多个空元素,则抛出 NullPointerException。 例子1 import java.util.ArrayList; import java.util.List; import java.util.concurrent.Concur...
addAll()Inserts all the elements which are present in the specified collection to the tail of this queue contains()Returns true if this queue contains the specified element forEach()Performs the given action for each element until all elements have been processed. ...
size() method in interface Collection<E>. Return Value: The size() method returns the total count of the elements present in this queue. Example 1 import java.util.concurrent.ConcurrentLinkedQueue; public class ConcurrentLinkedQueueSizeExample1 { public static void main(String[] args) { Concurre...
Exception in thread "main" java.lang.NullPointerException at java.util.TreeMap.put(TreeMap.java:563) at java.util.TreeSet.add(TreeSet.java:255) at com.javaTpoint.ConcurrentLinkedQueueRetainAllExample3.main(ConcurrentLinkedQueueRetainAllExample3.java:13) 相關...
Java ConcurrentLinkedQueue forEach() Method with Examples on java, concurrentlinkedqueue, addAll() method, add() method, isEmpty(), iterator(), peek(), size(), toArray(T[] a), poll(), offer(E e), contains(Object o), toArray() etc.
26.public Collection<V>values()The values() method of ConcurrentHashMap class returns a Collection view of the values contained in this map. The map backs the collection, so changes to the map are reflected in the collection, and vice-versa. The collection supports element removal, which remo...
Exception in thread "main" java.lang.NullPointerException at java.util.Objects.requireNonNull(Objects.java:203) Total no:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] at java.util.Collection.removeIf(Collection.java:410) at com.javaTpoint.Con...
Java ConcurrentHashMap toString() Method with Examples on java, concurrenthashmap class, methods, clear() method, compute() method, merge(), contains(), elements(), entryset(), equals(), foreach(), get(), hashcode(), isempty(), keys(), put(), replace(),
Java ConcurrentHashMap merge() Method with Examples on java, concurrenthashmap class, methods, clear() method, compute() method, merge(), contains(), elements(), entryset(), equals(), foreach(), get(), hashcode(), isempty(), keys(), put(), replace(), sea
true if and only if the specified object is a key in this table, as determined by the equals method; false otherwise Throws NullPointerException Example 1 importjava.util.*; importjava.util.concurrent.*; publicclassConcurrentHashMapcontainsKeyExample1 { ...