Java BlockingDeque size()用法及代码示例

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。如果容器受容量限制，则它还会返回函数调用时容器中存在的元素数。

用法:

public int size()

返回值：此方法返回一个整数值，该值表示容器中的元素数。

注意：BlockingDeque的size()方法已从Java中的LinkedBlockingDeque类继承。

以下示例程序旨在说明BlockingDeque的size()方法：

示例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

示例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： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#size()

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 BlockingDeque size() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。