Java 中的 PriorityBlockingQueue size()方法
原文:https://www . geeksforgeeks . org/priorityblockingqueue-size-method-in-Java/
优先级阻塞队列 的大小()方法用于查找队列的当前大小。它返回集合中的元素数量。如果集合包含多个整数。元素，则该方法返回整数。最大值。
语法:
public int size()
返回值:这个方法返回这个优先级阻塞队列中存在的元素数量
下面是说明优先级阻塞队列大小()方法的程序:
程序 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());
}
}
Output:
Queue: [1, 2, 3, 4]
Queue Size: 4
程序 2: 演示动态改变队列的大小()。
// 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());
}
}
Output:
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
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