Java PriorityBlockingQueue clear()用法及代碼示例

PriorityBlockingQueue的clear()方法從此隊列中刪除所有元素。因此，當需要清除PriorityBlockingQueue時，可以應用此方法。

用法:

public void clear()

參數：
此方法不帶參數。

返回值：
此方法不返回任何內容。

異常：
此方法不會引發任何異常。

以下示例程序旨在說明使用clear()方法從PriorityBlockingQueue中刪除所有元素。

示例1:

// Java Program to Demonstrate clear() method 
// of PriorityBlockingQueue. 
  
import java.util.concurrent.PriorityBlockingQueue; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // define capacity of PriorityBlockingQueue 
        int capacity = 15; 
  
        // create object of PriorityBlockingQueue 
        PriorityBlockingQueue<Integer> PrioBlockingQueue 
            = new PriorityBlockingQueue<Integer>(capacity); 
  
        // add numbers 
        PrioBlockingQueue.add(78758575); 
        PrioBlockingQueue.add(63447688); 
        PrioBlockingQueue.add(56434788); 
  
        // print queue after add operation 
        System.out.println("After Adding  Numbers:"); 
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue); 
  
        // remove all the elements using clear() method 
        PrioBlockingQueue.clear(); 
  
        // print queue after clear operation 
        System.out.println("\nAfter clear operation:"); 
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue); 
    } 
}

輸出：

After Adding  Numbers:
PriorityBlockingQueue:[56434788, 78758575, 63447688]

After clear operation:
PriorityBlockingQueue:[]

示例2:為了說明在PriorityBlockingQueue上包含名稱列表的清晰方法。

// Java Program to Demonstrate clear() method 
// of PriorityBlockingQueue. 
  
import java.util.concurrent.PriorityBlockingQueue; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // define capacity of PriorityBlockingQueue 
        int capacity = 15; 
  
        // create object of PriorityBlockingQueue 
        PriorityBlockingQueue<String> PrioBlockingQueue 
            = new PriorityBlockingQueue<String>(capacity); 
  
        // add some names 
        PrioBlockingQueue.add("Tandrima"); 
        PrioBlockingQueue.add("Argha"); 
        PrioBlockingQueue.add("Arka"); 
  
        // print queue after add operation 
        System.out.println("List of Names:"); 
        System.out.println("PriorityBlockingQueue: "
                           + PrioBlockingQueue); 
  
        // remove all the elements using clear() method 
        PrioBlockingQueue.clear(); 
  
        // print queue after clear operation 
        System.out.println("\nAfter clearing List of names:"); 
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue); 
    } 
}

輸出：

List of Names:
PriorityBlockingQueue: [Argha, Tandrima, Arka]

After clearing List of names:
PriorityBlockingQueue:[]

參考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#clear–

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