线程的休眠和让步还有加入

package ch12;

public class SleepText {
public static void main(String[] args) {
System.out.println("主线程启动：");
Thread t1 = new Thread(new SleepRunner());
t1.start();
for(int i=1;i<=50;i++)
{
System.out.println(Thread.currentThread().getName()+":"+i);
if(i==30)
{
try {
t1.join();//把子线程加入到主线程中执行
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
System.out.println("启动一个新的线程t1。。。。");
Thread t2= new Thread(new NRunner());
t2.start();
System.out.println("启动一个新的线程t2。。。。");
}
}
class SleepRunner implements Runnable
{

@Override
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(100);//休眠100ms
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for(int i=0;i<1000;i++)
{
System.out.println("SleepRunner:"+i);
}
}
}
class NRunner extends Thread
{

@Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<1000;i++)
{
System.out.println(Thread.currentThread().getName()+":"+i);
if(i%10==0)
{
Thread.yield();//如果i能被10整除，则当前线程让步给其他线程
}
}
}

}