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
// PriorityQueue
import 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(): []

翻译自: https://www.includehelp.com/java/priorityqueue-clear-method-with-example.aspx