Java中的LinkedBlockingDeque size()方法

LinkedBlockingDeque 的 size() 方法返回Deque容器中当前的大小。调用函数时，返回Deque容器中的元素数量。如果容器受到容量限制，那么它也会返回在函数调用时容器中存在的元素数。

语法：

public int size()

返回值： 此方法返回一个整数值，表示容器中的元素数量。

以下程序说明了LinkedBlockingDeque的size()方法：

程序1：

// Java Program to demonstrate public int size()
// method of LinkedBlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(15);
        LBD.add(20);
        LBD.add(20);
        LBD.add(15);
        LBD.add(15);
        LBD.add(20);
        LBD.add(20);
        LBD.add(15);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // prints the Deque after removal
        System.out.println("LinkedBlockingDeque的大小："
                           + LBD.size());
    }
}

Linked Blocking Deque: [15, 20, 20, 15, 15, 20, 20, 15]
LinkedBlockingDeque的大小：8

程序2：

// Java Program to demonstrate public int size()
// method of LinkedBlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<String> LBD
            = new LinkedBlockingDeque<String>();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.add("geeks");
        LBD.add("forGeeks");
        LBD.add("A Computer");
        LBD.add("Portal");
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // prints the Deque after removal
        System.out.println("LinkedBlockingDeque的大小："
                           + LBD.size());
    }
}

Linked Blocking Deque: [geeks, forGeeks, A Computer, Portal]
LinkedBlockingDeque的大小：4

参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#size–