Java 中 ArrayBlockingQueue clear()方法
原文:https://www . geeksforgeeks . org/arrayblockingqueue-clear-method-in-Java/
ArrayBlockingQueue是有界的,阻塞队列存储由数组支持的内部元素。
- ArrayBlockingQueue类是 Java Collections 框架的成员。
- 有界意味着它会有一个固定的大小,你可以不存储的元素数量超过队列的容量。
- 队列还遵循先进先出规则来存储和移除队列中的元素。
- 如果你试图把一个元素放到一个满的队列中,或者从一个空的队列中取出一个元素,那么这个队列就会阻塞你。
clear() 方法从该队列中移除所有元素。应用此方法后,队列将变空。 语法:
public void clear()
下面的程序说明了 ArrayBlockingQueue 的 clear()方法。 例 1
// Java Program Demonstrate clear()
// method of ArrayBlockingQueue.
import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// define capacity of ArrayBlockingQueue
int capacity = 5;
// create object of ArrayBlockingQueue
ArrayBlockingQueue<Integer> queue
= new ArrayBlockingQueue<Integer>(capacity);
// Add element to ArrayBlockingQueue
queue.add(23);
queue.add(32);
queue.add(45);
queue.add(12);
// print queue after adding numbers
System.out.println("After addding numbers");
System.out.println(queue);
// Apply clear() method
queue.clear();
// print queue after clear() operation
System.out.println("After clear() method");
System.out.println(queue);
}
}
Output :
After addding numbers
[23, 32, 45, 12]
After clear() method
[]
例 2
// Java Program Demonstrate clear()
// method of ArrayBlockingQueue.
import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// define capacity of ArrayBlockingQueue
int capacity = 5;
// create object of ArrayBlockingQueue to store 5 names
ArrayBlockingQueue<String> names
= new ArrayBlockingQueue<String>(capacity);
// Add element to ArrayBlockingQueue
names.add("Aman");
names.add("Siddhant");
names.add("Mahafuj");
names.add("Raunak");
names.add("Suvo");
// print queue after adding numbers
System.out.println("List of Names: " + names);
System.out.println("Remaining Capacity: " + names.remainingCapacity());
// Apply clear() method
names.clear();
// print queue after clear() operation
System.out.println("List of Names: " + names);
System.out.println("Remaining Capacity: " + names.remainingCapacity());
}
}
Output :
List of Names: [Aman, Siddhant, Mahafuj, Raunak, Suvo]
Remaining Capacity: 0
List of Names: []
Remaining Capacity: 5
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