多线程--join和yield

//A线程遇到B线程join A线程让出执行权 直到B线程执行完毕再执行public class JoinDemo {public static void main(String[] args) throws Exception{Demo d=new Demo();Thread t1=new Thread(d);Thread t2=new Thread(d);t1.setName("t1");t2.setName("t2");t1.start();//t1.join();t2.start();t1.join();for(int i=0;i<80;i++){System.out.println("main----------"+"  i="+i);}}}class Demo implements Runnable{public void run(){for(int i=0;i<50;i++){System.out.println(Thread.currentThread().getName()+"  i="+i);}}}

class YieldDemo {public static void main(String[] args) {Demo d=new Demo();Thread t1=new Thread(d);Thread t2=new Thread(d);t1.start();t2.start();}}class Demo implements Runnable{public void run(){for(int i=0;i<100;i++){Thread.yield();System.out.println(Thread.currentThread().getName()+"..."+i);}}}