java delayQueue 结合网上例子进行测试

 

import java.util.Iterator;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;

class Student1 implements Runnable, Delayed {

    private String name;
    private long workTime;
    private long submitTime;
    private boolean isForce = false;
    private CountDownLatch countDownLatch;

    public Student1() {
    }

    public Student1(String name, long workTime, CountDownLatch countDownLatch) {
        this.name = name;
        this.workTime = workTime;
        this.submitTime = TimeUnit.NANOSECONDS.convert(workTime,
                TimeUnit.NANOSECONDS) + System.nanoTime();
        this.countDownLatch = countDownLatch;
    }

    @Override
    public int compareTo(Delayed o) {
        // TODO Auto-generated method stub
        if (o == null || !(o instanceof Student1))
            return 1;
        if (o == this)
            return 0;
        Student1 s = (Student1) o;
        if (this.workTime > s.workTime) {
            return 1;
        } else if (this.workTime == s.workTime) {
            return 0;
        } else {
            return -1;
        }
    }

    @Override
    public long getDelay(TimeUnit unit) {
        // TODO Auto-generated method stub
        return unit.convert(submitTime - System.nanoTime(),
                TimeUnit.NANOSECONDS);
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        if (isForce) {
            System.out.println(name + " 交卷, 希望用时" + workTime + "分钟"
                    + " ,实际用时 120分钟");
        } else {
            System.out.println(name + " 交卷, 希望用时" + workTime + "分钟" + " ,实际用时 "
                    + workTime + " 分钟");
        }
        countDownLatch.countDown();
    }

    public boolean isForce() {
        return isForce;
    }

    public void setForce(boolean isForce) {
        this.isForce = isForce;
    }

}

class Endtest extends Student1 {

    private DelayQueue students;
    private CountDownLatch countDownLatch;
    private Thread teacherThread;

    public Endtest(DelayQueue students, long workTime,
            CountDownLatch countDownLatch, Thread teacherThread) {
        super("强制收卷", workTime, countDownLatch);
        this.students = students;
        this.countDownLatch = countDownLatch;
        this.teacherThread = teacherThread;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub

        teacherThread.interrupt();
        Student1 tmpStudent;
        for (Iterator iterator2 = students.iterator(); iterator2
                .hasNext();) {
            tmpStudent = iterator2.next();
            tmpStudent.setForce(true);
            tmpStudent.run();
        }
        countDownLatch.countDown();
    }

}

class Teacher implements Runnable {

    private DelayQueue students;

    public Teacher(DelayQueue students) {
        this.students = students;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        try {
            System.out.println(" test start");
            while (!Thread.interrupted()) {
                students.take().run();
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

}

public class delayQueueDemo {
    public static void main(String[] args) throws InterruptedException {
        // TODO Auto-generated method stub
        int studentNumber = 30;
        CountDownLatch countDownLatch = new CountDownLatch(studentNumber + 1);
        DelayQueue students = new DelayQueue();
        Random random = new Random();
        for (int i = 0; i < studentNumber; i++) {
            students.put(new Student1("student" + (i + 1), 30 + random
                    .nextInt(120), countDownLatch));
        }
        Thread teacherThread = new Thread(new Teacher(students));
        students.put(new Endtest(students, 120, countDownLatch, teacherThread));
        teacherThread.start();
        countDownLatch.await();
        System.out.println(" 考试结束，全部交卷！");
    }

}