Java中的 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。如果容器容量受限，则它还返回函数调用时容器中存在的元素数量。

句法：

public int size()

返回：此方法返回一个整数值，表示容器中元素的数量。

注意： BlockingDeque的size()方法继承自Java中的 LinkedBlockingDeque 类。

下面的程序说明了 BlockingDeque 的 size() 方法：

方案一：

// 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 BD
            = new LinkedBlockingDeque();
  
        // 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

方案二：

// 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 BD
            = new LinkedBlockingDeque();
  
        // 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： https: Java/util/concurrent/BlockingDeque.html#size()