ArrayBlockingQueue 中的 size() 方法


欲瞭解佇列中元素的數目,使用 ArrayBlockingQueue 類的 size() 方法。

語法如下

int size()

要使用 ArrayBlockingQueue 類,需要匯入以下包

import java.util.concurrent.ArrayBlockingQueue;

以下是一個使用 Java ArrayBlockingQueue 類的 size() 方法的示例

示例

 線上演示

import java.util.concurrent.ArrayBlockingQueue;
public class Demo {
   public static void main(String[] args) throws InterruptedException {
      ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(10);
      q.add(200);
      q.add(310);
      q.add(400);
      q.add(450);
      q.add(500);
      q.add(550);
      q.add(700);
      System.out.println("ArrayBlockingQueue = " + q);
      System.out.println("The head of the queue = "+q.take());
      System.out.println("Number of elements in the queue = "+q.size());
      // adding more elements
      q.add(50);
      q.add(70);
      q.add(90);
      System.out.println("ArrayBlockingQueue = " + q);
      System.out.println("The head of the queue = "+q.take());
      System.out.println("Number of elements in the queue = "+q.size());
   }
}

輸出

ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700]
The head of the queue = 200
Number of elements in the queue = 6
ArrayBlockingQueue = [310, 400, 450, 500, 550, 700, 50, 70, 90]
The head of the queue = 310
Number of elements in the queue = 8

更新於: 30-Jul-2019

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