PriorityBlockingQueue的size()方法用于查找队列的当前大小。它返回集合中元素的数量。如果集合包含多个Integer.MAX_VALUE元素,则此方法返回Integer.MAX_VALUE。
用法:
public int size()
返回值:此方法返回此PriorityBlockingQueue中存在的元素数
下面是说明PriorityBlockingQueue的size()方法的程序:
示例1:
// Java program to demonstrate
// size() method
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// create object of PriorityBlockingQueue
PriorityBlockingQueue<String> pbq
= new PriorityBlockingQueue<String>();
// Add element to PriorityBlockingQueue
pbq.put("1");
pbq.put("2");
pbq.put("3");
pbq.put("4");
// print queue
System.out.println("Queue: " + pbq);
System.out.println("Queue Size: " + pbq.size());
}
}
输出:
Queue: [1, 2, 3, 4] Queue Size: 4
示例2:演示size()用于动态更改队列。
// Java program to demonstrate
// size() method
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// create object of PriorityBlockingQueue
PriorityBlockingQueue<String> pbq
= new PriorityBlockingQueue<String>();
// Add element to PriorityBlockingQueue
pbq.put("1");
pbq.put("2");
pbq.put("3");
pbq.put("4");
// print queue
System.out.println("Queue: " + pbq);
System.out.println("Queue Size: " + pbq.size());
// remove 2
boolean res = pbq.remove("2");
System.out.println("\n2 removed: " + res);
// print queue
System.out.println("Queue: " + pbq);
System.out.println("Queue Size: " + pbq.size());
// add 5
pbq.put("5");
// print queue
System.out.println("\n5 added");
System.out.println("Queue: " + pbq);
System.out.println("Queue Size: " + pbq.size());
}
}
输出:
Queue: [1, 2, 3, 4] Queue Size: 4 2 removed: true Queue: [1, 4, 3] Queue Size: 3 5 added Queue: [1, 4, 3, 5] Queue Size: 4
相关用法
- Java PriorityBlockingQueue contains()用法及代码示例
- Java PriorityBlockingQueue put()用法及代码示例
- Java PriorityBlockingQueue take()用法及代码示例
- Java PriorityBlockingQueue add()用法及代码示例
- Java PriorityBlockingQueue drainTo()用法及代码示例
- Java PriorityBlockingQueue spliterator()用法及代码示例
- Java PriorityBlockingQueue clear()用法及代码示例
- Java PriorityBlockingQueue offer()用法及代码示例
- Java PriorityBlockingQueue poll()用法及代码示例
- Java PriorityBlockingQueue toArray()用法及代码示例
- Java PriorityBlockingQueue remove()用法及代码示例
- Java PriorityBlockingQueue remainingCapacity()用法及代码示例
- Java PriorityBlockingQueue comparator()用法及代码示例
- Java PriorityBlockingQueue iterator()用法及代码示例
- Java PriorityBlockingQueue peek()用法及代码示例
注:本文由纯净天空筛选整理自Code_r大神的英文原创作品 PriorityBlockingQueue size() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。