Java 中的 PriorityBlockingQueue clear()方法
原文:https://www . geeksforgeeks . org/priorityblockingqueue-clear-method-in-Java/
PriorityBlockingQueue 的 clear() 方法移除该队列中的所有元素。因此，当需要清除优先级阻塞队列时，可以应用此方法。
语法:
public void clear()
参数: 该方法不取参数。
返回: 此方法不返回任何内容。
异常: 这个方法不抛出任何异常。
下面的程序演示了如何使用 clear()方法从 PriorityBlockingQueue 中移除所有元素。
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);
}
}
Output:
After Adding Numbers:
PriorityBlockingQueue:[56434788, 78758575, 63447688]
After clear operation:
PriorityBlockingQueue:[]
示例 2: 说明包含名称列表的优先级阻塞队列的清除方法。
// 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);
}
}
Output:
List of Names:
PriorityBlockingQueue: [Argha, Tandrima, Arka]
After clearing List of names:
PriorityBlockingQueue:[]
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