Java多线程实战：创建与管理

java一个多线程的经典例子
import java.io.*;

//多线程编程
public class MultiThread {
    public static void main(String args[]) {
        System.out.println("我是主线程!");
        // 下面创建线程实例thread1
        ThreadUseExtends thread1 = new ThreadUseExtends();
        // 创建thread2时以实现了Runnable接口的THhreadUseRunnable类实例为参数
        Thread thread2 = new Thread(new ThreadUseRunnable(), "SecondThread");
        thread1.start();// 启动线程thread1使之处于就绪状态
        // thread1.setPriority(6);//设置thread1的优先级为6
        // 优先级将决定cpu空出时，处于就绪状态的线程谁先占领cpu开始运行
        // 优先级范围1到10,MIN_PRIORITY,MAX_PRIORITY,NORM_PAIORITY
        // 新线程继承创建她的父线程优先级,父线程通常有普通优先级即5NORM_PRIORITY
        System.out.println("主线程将挂起7秒!");
        try {
            Thread.sleep(7000);// 主线程挂起7秒
        } catch (InterruptedException e) {
            return;
        }
        System.out.println("又回到了主线程!");
        if (thread1.isAlive()) {
            thread1.stop();// 如果thread1还存在则杀掉他
            System.out.println("thread1休眠过长,主线程杀掉了thread1!");
        } else
            System.out.println("主线程没发现thread1,thread1已醒顺序执行结束了!");
        thread2.start();// 启动thread2
        System.out.println("主线程又将挂起7秒!");