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Java ConcurrentLinkedQueue isEmpty()用法及代碼示例


ConcurrentLinkedQueue的isEmpty()方法用於檢查此隊列是否為空。如果ConcurrentLinkedQueue包含零個元素,則返回true,表示ConcurrentLinkedQueue為空。

用法:

public boolean isEmpty()

返回值:如果此ConcurrentLinkedQueue包含零個元素,則此方法返回true。


以下示例程序旨在說明ConcurrentLinkedQueue的isEmpty()方法:

示例1:

// Java Program Demonstrate isEmpty() 
// method of ConcurrentLinkedQueue 
  
import java.util.concurrent.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create an ConcurrentLinkedQueue 
        ConcurrentLinkedQueue<String> 
            queue = new ConcurrentLinkedQueue<String>(); 
  
        // Add String to queue 
        queue.add("Aman"); 
        queue.add("Amar"); 
        queue.add("Sanjeet"); 
        queue.add("Rabi"); 
  
        // Displaying the existing ConcurrentLinkedQueue 
        System.out.println("ConcurrentLinkedQueue: " + queue); 
  
        // check whether queue isEmpty or not 
        boolean response1 = queue.isEmpty(); 
  
        // print after applying isEmpty method 
        System.out.println("Is Queue empty: " + response1); 
    } 
}
輸出:
ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi]
Is Queue empty: false

示例2:

// Java Program Demonstrate isEmpty() 
// method of ConcurrentLinkedQueue 
  
import java.util.concurrent.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create an ConcurrentLinkedQueue 
        ConcurrentLinkedQueue<Integer> 
            queue = new ConcurrentLinkedQueue<Integer>(); 
  
        // Displaying the existing ConcurrentLinkedQueue 
        System.out.println("ConcurrentLinkedQueue: " + queue); 
  
        // check whether queue is Empty 
        boolean response1 = queue.isEmpty(); 
  
        // print after applying isEmpty method 
        System.out.println("Is queue empty  : " + response1); 
    } 
}
輸出:
ConcurrentLinkedQueue: []
Is queue empty  : true

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



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