FixedThreadPool 使用方法测试

Love The Way You Lie 2022-02-21 11:18 213阅读 0赞

public class testFixedThreadPool{
    
        /**
         * 固定大小的线程池
         *
         * 同时可以处理【参数】个任务，多余的任务会排队，当处理完一个马上就会去接着处理排队中的任务。
         * Callable的任务在后面的blog有更详细的文章说明
         */
        private static void fixedThreadPool(){
    
            long startTime = System.currentTimeMillis();
            ExecutorService es = Executors.newFixedThreadPool(5);
    
    
            for(int i=1; i <= 15; i++){
                 es.submit(new MyThread(i, es));
            }
    
            // 结束所有线程
    //        es.shutdown();
            CreateThread createThread = new CreateThread(es);
            new Thread(createThread).start();
            System.out.println("******************************************************");
            while(true){
                try {
                    Thread.sleep(500);
                    System.out.println("all -- " + es.toString());
                    if(es.isTerminated()){
                        System.out.println("last -- " + es.toString());
                        long end = System.currentTimeMillis();
                        System.out.println("线程执行用时: " + (end - startTime) + "ms");
                        break;
                    }
    
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
    
        }
    
        public static void main(String[] args) {
            fixedThreadPool();
        }
    
        static class MyThread implements Runnable
        {
            int id;
            ExecutorService exe;
            MyThread(int id, ExecutorService exe) {
                this.id = id;
                this.exe = exe;
            }
            public void run() {
                System.out.println(id + "- start");
                try {
                    Thread.sleep(1000L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                /*while (true) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }*/
                System.out.println(id + "- end");
                System.out.println(id + "- exe info:" + exe.toString());
            }
        }
    
        static class CreateThread implements Runnable
        {
            ExecutorService exe;
            CreateThread(ExecutorService exe) {
                this.exe = exe;
            }
            public void run() {
                try {
                    int n = 100;
                    while (true) {
                        Thread.sleep(5000L);
                        for(int i=1; i <= 15; i++){
                            exe.submit(new MyThread(n + i, exe));
                        }
                        n++;
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    
    }