Java BlockingDeque remove()方法及示例

BlockingDeque 的 remove() 方法会删除Deque容器的头部。如果Deque容器是空的，该方法会抛出一个NoSuchElementException。如果在参数中传递了一个元素，如果Deque中存在该元素，它就会将其删除。

语法

public E remove() or boolean remove(element)

参数： 该方法接受一个临时参数元素，该元素将被从BlockingDeque中删除。

返回： 如果参数被传递，该方法返回真或假，否则不返回。如果该元素在Deque中存在，则返回真，否则返回假。

异常 ：如果Deque是空的，该函数会抛出一个NoSuchElementException。

注意 ： BlockingDeque 的 remove() 方法是从Java的LinkedBlockingDeque类中继承的。

以下程序说明了BlockingDeque的remove()方法。

程序1 :

// Java Program Demonstrate remove()// method of BlockingDeque  import java.util.concurrent.LinkedBlockingDeque;import java.util.concurrent.BlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)        throws InterruptedException    {          // create object of BlockingDeque        BlockingDeque<Integer> BD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of BlockingDeque        BD.add(7855642);        BD.add(35658786);        BD.add(5278367);        BD.add(74381793);          // print Deque        System.out.println("Blocking Deque: " + BD);          // removes the front element        BD.remove();        System.out.println("Blocking Deque: " + BD);          // removes the element        BD.remove(5278367);        System.out.println("Blocking Deque: " + BD);    }}

输出:

Blocking Deque: [7855642, 35658786, 5278367, 74381793]Blocking Deque: [35658786, 5278367, 74381793]Blocking Deque: [35658786, 74381793]

程序2

// Java Program Demonstrate remove()// method of BlockingDeque  import java.util.concurrent.LinkedBlockingDeque;import java.util.concurrent.BlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)        throws InterruptedException    {          // create object of BlockingDeque        BlockingDeque<Integer> BD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of BlockingDeque        BD.add(7855642);        BD.add(35658786);        BD.add(5278367);        BD.add(74381793);          // print Deque        System.out.println("Blocking Deque: " + BD);          BD.clear();          // removes the front element        BD.remove();        System.out.println("Blocking Deque: " + BD);          // removes the element        BD.remove(5278367);        System.out.println("Blocking Deque: " + BD);    }}

输出

Exception in thread "main" java.util.NoSuchElementException    at java.util.concurrent.LinkedBlockingDeque.removeFirst(LinkedBlockingDeque.java:453)    at java.util.concurrent.LinkedBlockingDeque.remove(LinkedBlockingDeque.java:672)    at GFG.main(GFG.java:29)

**参考资料: **https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#remove()