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()