线程等待与唤醒实现

package cn.itcast.demo4;
/*

• 定义资源类,有2个成员变量

• name,sex

• 同时有2个线程,对资源中的变量操作

• 1个对name,age赋值

• 2个对name,age做变量的输出打印
  /
  public class Resource {
  public String name;
  public String sex;
  public boolean flag = false;
  }
  package cn.itcast.demo4;
  /

• 开启输入线程和输出线程,实现赋值和打印值
  */
  public class ThreadDemo{
  public static void main(String[] args) {

  Resource r = new Resource();
  
  Input in = new Input(r);
  Output out = new Output(r);
  
  Thread tin = new Thread(in);
  Thread tout = new Thread(out);
  
  tin.start();
  tout.start();
  

  }
  }
  package cn.itcast.demo4;
  /*

• 输入的线程,对资源对象Resource中成员变量赋值

• 一次赋值 张三,男

• 下一次赋值 lisi,nv
  */
  public class Input implements Runnable {
  private Resource r ;

  public Input(Resource r){
  this.r = r;
  }

  public void run() {
  int i = 0 ;
  while(true){
  synchronized®{
  //标记是true,等待
  if(r.flag){
  try{r.wait();}catch(Exception ex){}
  }

  		if(i%2==0){
  			r.name = "张三";
  			r.sex = "男";
  		}else{
  			r.name = "lisi";
  			r.sex = "nv";
  		}
  		//将对方线程唤醒,标记改为true
  		r.flag = true;
  		r.notify();
    }
  	i++;
  }
  

  }

}

package cn.itcast.demo4;
/*

• 输出线程,对资源对象Resource中成员变量,输出值
  */
  public class Output implements Runnable {
  private Resource r ;

  public Output(Resource r){
  this.r = r;
  }
  public void run() {
  while(true){
  synchronized®{
  //判断标记,是false,等待
  if(!r.flag){
  try{r.wait();}catch(Exception ex){}
  }
  System.out.println(r.name+"…"+r.sex);
  //标记改成false,唤醒对方线程
  r.flag = false;
  r.notify();
  }
  }
  }

}