Java BlockingDeque size()方法及示例

BlockingDeque 的 size() 方法返回Deque容器的当前大小。在调用该函数时，将返回Deque容器中的元素数量。如果容器有容量限制，那么也会返回在调用函数时容器中存在的元素数量。

语法

public int size()

返回： 该方法返回一个整数，表示容器中元素的数量。

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

以下程序说明了BlockingDeque的size()方法。

程序1 :

// Java Program to demonstrate public int size()// 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(15);        BD.add(20);        BD.add(20);        BD.add(15);        BD.add(15);        BD.add(20);        BD.add(20);        BD.add(15);          // print Deque        System.out.println("Blocking Deque: " + BD);          // prints the Deque after removal        System.out.println("Size of Blocking Deque: "                           + BD.size());    }}

输出:

Blocking Deque: [15, 20, 20, 15, 15, 20, 20, 15]Size of Blocking Deque: 8

程序2

// Java Program to demonstrate public int size()// 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<String> BD            = new LinkedBlockingDeque<String>();          // Add numbers to end of BlockingDeque        BD.add("geeks");        BD.add("forGeeks");        BD.add("A Computer");        BD.add("Portal");          // print Dequeue        System.out.println("Blocking Deque: " + BD);          // prints the Deque after removal        System.out.println("Size of Blocking Deque: "                           + BD.size());    }}

输出:

Blocking Deque: [geeks, forGeeks, A Computer, Portal]Size of Blocking Deque: 4

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