Java中的 LinkedBlockingQueue clear() 方法

LinkedBlockingQueue 的clear()方法从该队列中删除所有元素。应用此方法后，队列将变为空。

句法：

public void clear()

下面的程序说明了 LinkedBlockingQueue 类的 clear() 方法：

方案一：

// Java Program Demonstrate clear()
// method of LinkedBlockingQueue
  
import java.util.concurrent.LinkedBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // define capacity of LinkedBlockingQueue
        int capacityOfQueue = 50;
  
        // create object of LinkedBlockingQueue
        LinkedBlockingQueue linkedQueue
            = new LinkedBlockingQueue(capacityOfQueue);
  
        // Add element to LinkedBlockingQueue
        linkedQueue.add(2300);
        linkedQueue.add(1322);
        linkedQueue.add(8945);
        linkedQueue.add(6512);
  
        // print queue
        System.out.println("LinkedBlockingQueue before using"
                           + " clear() : " + linkedQueue);
  
        // Apply clear() method
        linkedQueue.clear();
  
        // print queue
        System.out.println();
        System.out.println("LinkedBlockingQueue after using"
                           + " clear() method : " + linkedQueue);
    }
}

输出：

LinkedBlockingQueue before using clear() : [2300, 1322, 8945, 6512]

LinkedBlockingQueue after using clear() method : []

方案二：

// Java Program Demonstrate clear()
// method of LinkedBlockingQueue
  
import java.util.concurrent.LinkedBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // define capacity of LinkedBlockingQueue
        int capacityOfQueue = 50;
  
        // create object of LinkedBlockingQueue
        LinkedBlockingQueue names
            = new LinkedBlockingQueue(capacityOfQueue);
  
        // Add element to ArrayBlockingQueue
        names.add("Shubham");
        names.add("Siddhant");
        names.add("Mahafuj");
        names.add("Arka");
        names.add("Raunak");
  
        // print queue
        System.out.println("LinkedBlockingQueue before using"
                           + " clear() : " + names);
  
        // Apply clear() method
        names.clear();
  
        // print queue
        System.out.println();
        System.out.println("LinkedBlockingQueue after using"
                           + " clear() method : " + names);
    }
}

输出：

LinkedBlockingQueue before using clear() : [Shubham, Siddhant, Mahafuj, Arka, Raunak]

LinkedBlockingQueue after using clear() method : []

参考： https: Java/util/concurrent/LinkedBlockingQueue.html#clear–