最多能同时运行5个线程,第6个线程只能等待前边的线程执行后才能运行;且后面的线程按优先顺序排队运行。
请写出设计思路及代码
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我觉得第一先判断有多少线程,然后小于5个线程直接一起运行,如果大于5个,就使用for循环将那5个放进循环里,然后每个线程的任务结束时,你可以设计个字段表示有空闲了,然后缺几个就按剩下线程的优先级放进去就好了,希望对你有帮助
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用executorService线程池,加上设置优先权
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我该是有多蛋疼啊,大半夜的:
- Java code
package com.ticmy.concurrency;import java.util.Date;import java.util.concurrent.PriorityBlockingQueue;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;public class TestPriorityTask { private static PriorityBlockingQueue<Runnable> workQueue = new PriorityBlockingQueue<Runnable>(); private static ThreadPoolExecutor pool = new ThreadPoolExecutor(5, 5, 0L, TimeUnit.MILLISECONDS, workQueue); public static void main(String[] args) throws Exception { for(int i=0; i<20; i++) { pool.execute(new Task(i)); } pool.awaitTermination(0, TimeUnit.MILLISECONDS); pool.shutdown(); }}class Task implements Runnable,Comparable<Task> { private int priority;//数值越大,优先级越大 public Task(int priority) { this.priority = priority; } public void run() { System.out.println("当前任务优先级:" + priority + ",执行线程:" + Thread.currentThread() + ",执行此句的时间:" + new Date()); try { TimeUnit.SECONDS.sleep(3); } catch (Exception e){} } public int compareTo(Task o) { return o.priority - priority; }}