Java PriorityBlockingQueue remove()方法

PriorityBlockingQueue的 remove(Object o) 方法是用来从这个队列中删除一个元素。 如果作为参数传递的元素存在的话， 该方法 会删除该元素的一个实例。

如果且仅当该元素被删除时，该方法会返回真，否则会返回假。

语法

public boolean remove(Object o)

参数: 这个方法接受一个强制性参数o，如果存在的话，就是要从这个队列中删除的元素。

返回值： 如果指定的元素被成功删除，该方法返回true。否则，该方法返回false。

下面的程序说明了PriorityBlockingQueue中的remove()方法。

程序1:

// Java Program Demonstrate remove()
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<Integer> pbq
            = new PriorityBlockingQueue<Integer>();
  
        // Add element to PriorityBlockingQueue
        pbq.put(1);
        pbq.put(2);
        pbq.put(3);
        pbq.put(4);
  
        // print queue
        System.out.println("Queue: " + pbq);
  
        // remove 2
        boolean res = pbq.remove(2);
        System.out.println("\n2 removed: " + res);
  
        // print queue
        System.out.println("Queue:  " + pbq);
  
        // remove 5
        res = pbq.remove(5);
        System.out.println("\n5 removed: " + res);
  
        // print queue
        System.out.println("Queue:  " + pbq);
    }
}

输出:

Queue: [1, 2, 3, 4]

2 removed: true
Queue:  [1, 4, 3]

5 removed: false
Queue:  [1, 4, 3]

// Java Program Demonstrate remove()
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> pbq
            = new PriorityBlockingQueue<String>();
  
        // Add element to PriorityBlockingQueue
        pbq.put("Geeks");
        pbq.put("forGeeks");
        pbq.put("A Computer");
        pbq.put("Portal");
  
        // print queue
        System.out.println("Queue: " + pbq);
  
        // remove Geeks
        boolean res = pbq.remove("Geeks");
        System.out.println("\nGeeks removed: " + res);
  
        // print queue
        System.out.println("Queue:  " + pbq);
  
        // remove SandeepJain
        res = pbq.remove("SandeepJain");
        System.out.println("\nSandeepJain removed: " + res);
  
        // print queue
        System.out.println("Queue:  " + pbq);
    }
}

输出:

Queue: [A Computer, Portal, Geeks, forGeeks]

Geeks removed: true
Queue:  [A Computer, Portal, forGeeks]

SandeepJain removed: false
Queue:  [A Computer, Portal, forGeeks]