Java多线程实践

1.实现Runnable接口

import java.util.Random;


public class PrintTask implements Runnable{
    private final int sleepTime;
    private final String taskName;
    private final static Random generator = new Random();
    
    
    public PrintTask(String name) {
        taskName = name;
        sleepTime = generator.nextInt(5000);
    }

    @Override
    public void run() {
        try {
            System.out.printf("%s going to Sleep for %d milliseconds.
",
                    taskName, sleepTime);
            Thread.sleep(sleepTime);
        } catch (InterruptedException e) {
            System.out.printf("%s %s
", taskName, "terminated prematurely" +
                    " due to interruption");
        }
        System.out.printf("%s done sleeping
", taskName);
    }

}

2.使用ExecutorService管理执行PrintTask的线程

import java.util.Random;


public class PrintTask implements Runnable{
    private final int sleepTime;
    private final String taskName;
    private final static Random generator = new Random();
    
    
    public PrintTask(String name) {
        taskName = name;
        sleepTime = generator.nextInt(5000);
    }

    @Override
    public void run() {
        try {
            System.out.printf("%s going to Sleep for %d milliseconds.
",
                    taskName, sleepTime);
            Thread.sleep(sleepTime);
        } catch (InterruptedException e) {
            System.out.printf("%s %s
", taskName, "terminated prematurely" +
                    " due to interruption");
        }
        System.out.printf("%s done sleeping
", taskName);
    }

}

3.执行结果

可以看到，由于每个任务随机休眠时间不同，执行结束的顺序是不同的。