Java PriorityQueue contains()用法及代码示例

Java.util.PriorityQueue.contains()方法用于检查PriorityQueue中是否存在特定元素。因此，本质上，它用于检查队列是否包含任何特定元素。

用法:

Priority_Queue.contains(Object element)

参数：参数element 是PriorityQueue的类型。如果队列中是否存在此元素，则需要对其进行测试。

返回值：如果该元素存在于队列中，则该方法返回True，否则返回False。

以下示例程序旨在说明Java.util.PriorityQueue.contains()方法：
示例1:

// Java code to illustrate contains() 
import java.util.PriorityQueue; 
  
public class PriorityQueueDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty PriorityQueue 
        PriorityQueue<String> queue = new PriorityQueue<String>(); 
  
        // Use add() method to add elements into the Queue 
        queue.add("Welcome"); 
        queue.add("To"); 
        queue.add("Geeks"); 
        queue.add("4"); 
        queue.add("Geeks"); 
  
        // Displaying the PriorityQueue 
        System.out.println("PriorityQueue: " + queue); 
  
        // Check for "Geeks" in the queue 
        System.out.println("Does the Queue contains 'Geeks'? "
        +queue.contains("Geeks")); 
  
        // Check for "4" in the queue 
        System.out.println("Does the Queue contains '4'? "
        +queue.contains("4")); 
  
        // Check if the Queue contains "No" 
        System.out.println("Does the Queue contains 'No'? "
        +queue.contains("No")); 
    } 
}

输出：

PriorityQueue: [4, Geeks, To, Welcome, Geeks]
Does the Queue contains 'Geeks'? true
Does the Queue contains '4'? true
Does the Queue contains 'No'? false

示例2:

// Java code to illustrate contains() 
import java.util.*; 
  
public class PriorityQueueDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty PriorityQueue 
        PriorityQueue<Integer> queue = new PriorityQueue<Integer>(); 
  
        // Use add() method to add elements into the Queue 
        queue.add(10); 
        queue.add(15); 
        queue.add(30); 
        queue.add(20); 
        queue.add(5); 
  
        // Displaying the PriorityQueue 
        System.out.println("PriorityQueue: " + queue); 
  
        // Check for '15' in the queue 
        System.out.println("Does the Queue contains '15'? "
        +queue.contains(15)); 
  
        // Check for '2' in the queue 
        System.out.println("Does the Queue contains '2'? "
        +queue.contains(2)); 
  
        // Check if the Queue contains '10' 
        System.out.println("Does the Queue contains '10'? "
        +queue.contains(10)); 
    } 
}

输出：

PriorityQueue: [5, 10, 30, 20, 15]
Does the Queue contains '15'? true
Does the Queue contains '2'? false
Does the Queue contains '10'? true

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 PriorityQueue contains() Method in Java。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。