public class House implements Runnable {int waterAmount;       //用int变量模拟水量public void setWater(int w) {waterAmount = w;}public void run() {     while(true) {String name=Thread.currentThread().getName();if(name.equals("狗")) { System.out.println(name+"喝水") ; waterAmount=waterAmount-2;  //狗喝的多
         }else if(name.equals("猫")){System.out.println(name+"喝水") ;   waterAmount=waterAmount-1;  //猫喝的少
         }System.out.println(" 剩 "+waterAmount);try{  Thread.sleep(2000);  //间隔时间
         }catch(InterruptedException e){}  if(waterAmount<=0) {return;    }  }}
}

public class Test{public static void main(String args[ ]) {House house = new House();house.setWater(10);Thread dog,cat;dog=new Thread(house); cat=new Thread(house);  //cat和dog的目标对象相同 dog.setName("狗");cat.setName("猫"); dog.start();cat.start();}
}

import java.util.Date;
import java.text.SimpleDateFormat;
public class Clock implements Runnable{int time=0;SimpleDateFormat m=new SimpleDateFormat("hh:mm:ss");Date date;public void run() {while(true) {date=new Date();System.out.println(m.format(date));time++;try {Thread.sleep(2000);}catch(InterruptedException e) {}if(time==3) {Thread thread=Thread.currentThread();thread=new Thread(this);thread.start();}}}}

public class Test{public static void main(String[] args) {Clock clock=new Clock();Thread homeTime=new Thread(clock);homeTime.start();}
}

public class ClassRoom implements Runnable{Thread student,teacher;ClassRoom(){student=new Thread(this);teacher=new Thread(this);teacher.setName("王教授");student.setName("小张");}public void run() {if(Thread.currentThread()==student) {try {System.out.println(student.getName()+"正在睡觉");Thread.sleep(1000*60*60);}catch(InterruptedException e) {System.out.println(student.getName()+"被老师吵醒了");}System.out.println(student.getName()+"开始听课");}else if(Thread.currentThread()==teacher) {for(int i=0;i<3;i++) {System.out.println("上课！");try {Thread.sleep(500);}catch(InterruptedException e) {}}student.interrupt();  //吵醒学生
        }}}

public class Test{public static void main(String[] args) {ClassRoom s=new ClassRoom();s.student.start();s.teacher.start();}
}