PriorityQueue类clear()方法 (PriorityQueue Class clear() method)

• clear() method is available in java.util package.

  clear()方法在java.util包中可用。

• clear() method is used to remove all the objects from this PriorityQueue.

  clear()方法用于从此PriorityQueue中删除所有对象。

• clear() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  clear()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• clear() method does not throw an exception at the time of clearing objects from the queue.

  从队列中清除对象时， clear()方法不会引发异常。

Syntax:

句法：

public void clear();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example // of void clear() method of // PriorityQueueimport java.util.*;public class ClearOfPriorityQueue {
       public static void main(String args[]) {
           // Instantiate PriorityQueue        PriorityQueue < String > pq = new PriorityQueue < String > ();        // By using add() method is add        // the given element into priority        // queue        pq.add("C");        pq.add("C++");        pq.add("JAVA");        pq.add("PHP");        pq.add("ANDROID");        // Display PriorityQueue        System.out.println("PriorityQueue: " + pq);        // By using clear() method is to        // remove all the existing elements        // from this PriorityQueue        pq.clear();        // Display Updated PriorityQueue        System.out.println("pq.clear(): " + pq);    }}

Output

输出量

PriorityQueue: [ANDROID, C, JAVA, PHP, C++]pq.clear(): []

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