线程中join方法和Sleep方法的举例

Sleep

package Thread01;

//sleep():  睡眠    让调用者进入阻塞状态
public class Sleep implements Runnable{

    static Thread t = null;
    public static void main(String[] args) {
        
        Sleep s = new Sleep();
         t = new Thread(s,"银河一号");
        System.out.println(t.getName()+"处于创建状态");
        t.start();
        
        
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        
        
        System.out.println("银河一号开始跑步!");
        
        try {
            System.out.println("银河一号进入休眠，处于阻塞状态");
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
        System.out.println(t.getName()+"处于就绪状态!");
    }

    
    
    
    
    
    
}

package Thread01;

//join();   参加      让调用进入就绪状态，让当前线程进入阻塞状态
public class join {

    static boolean boo = false;
    public static void main(String[] args) {

        Thread t1 = new Thread("线程1下载图片:") {

            public void run() {
                System.out.println("download:开始下载图片!");

                for (int i = 0; i <= 100; i++) {

                    System.out.println(Thread.currentThread().getName() + "正在下载:" + i + "%");
                }

                //下载完成
                boo = true;
            }

        };
        Thread t2 = new Thread() {
        
    
            public void run() {
                
                
                try {
                    //要先下载再显示
                    t1.join();
                    System.out.println("show:显示图片");
                    
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    System.out.println("程序中止");
                }
                //没有下载完成  抛出没有下载完成就不能显示的异常
                if(!boo) {
                    
                    //异常Exception 分为检查异常(Checked Exception)和非检查异常(Runtime Exception)
                    throw new RuntimeException("还未下载完成不能显示!");
                    
                    
                }
                System.out.println("显示结束!");
                
                
                
            }
        
        
        
        };
        
//开启两个线程
        t1.start();
        t2.start();
        
}

}