Java LinkedBlockingDeque size()用法及代碼示例

LinkedBlockingDeque的size()方法返回Deque容器的當前大小。在調用該函數時，將返回Deque容器中的元素數量。如果容器受容量限製，則它還會返回函數調用時容器中存在的元素數。

用法:

public int size()

返回值：此方法返回一個整數值，該值表示容器中的元素數。

以下示例程序旨在說明LinkedBlockingDeque的size()方法：

示例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("Size of Linked Blocking Deque: "
                           + LBD.size()); 
    } 
}

輸出：

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

示例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("Size of Linked Blocking Deque: "
                           + LBD.size()); 
    } 
}

輸出：

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

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

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