关于生产者,消费者问题

[abc44718455]

我写了个正确的生产者,消费者问题,能够运行成功:
package org.com;

public class consumer implements Runnable{
buffer bu ;
public consumer(buffer bu){
this.bu = bu;
}

public void run(){
while(true){
bu.out();
}

}

}






package org.com;

public class producer implements Runnable{
buffer bu;
String name = "";
String sex = "";


public producer(buffer bu){
this.bu = bu;
}

public void run(){
int i = 0;
while(true){
if(i == 0){
bu.put("zhangshan", "man");

}
else{
bu.put("lisi", "feman");

}
i = (i+1)%2;

}
}

}




package org.com;

public class buffer {
String name = "unknow";
String sex = "unknow";
boolean bFull = false;

public synchronized void put(String name,String sex){
if(bFull==true)
try{this.wait();}catch(Exception e){}
this.name = name;
try{Thread.sleep(1);}catch(Exception e){}
this.sex = sex;
bFull = true;
this.notify();


}

public synchronized void out(){
if(bFull==true)
try{this.wait();}catch(Exception e){}
System.out.println("name:"+name+",sex:"+sex);
bFull = false;
this.notify();

}

public static void main(String[] args){
buffer bu = new buffer();
producer pd = new producer(bu);
consumer cs = new consumer(bu);
Thread t1 = new Thread(pd);
Thread t2 = new Thread(cs);
t1.start();
t2.start();
}

}
可是当我把程序改写一下,就不能按原来的实现了,小弟不知道是什么原因,请大家指点:
package org.com;

public class buffer {
String name = "unknow";
String sex = "unknow";
boolean bFull = false;

public synchronized void put(String name,String sex){
if(bFull==false){

this.name = name;
try{Thread.sleep(1);}catch(Exception e){}
this.sex = sex;
bFull = true;
this.notify();
}else
try{this.wait();}catch(Exception e){}

}

public synchronized void out(){
if(bFull==true){

System.out.println("name:"+name+",sex:"+sex);
bFull = false;
this.notify();
}else
try{this.wait();}catch(Exception e){}
}

public static void main(String[] args){
buffer bu = new buffer();
producer pd = new producer(bu);
consumer cs = new consumer(bu);
Thread t1 = new Thread(pd);
Thread t2 = new Thread(cs);
t1.start();
t2.start();
}

}
其中标记的部分是修改的部分

[老紫竹]

差别很大
比如put

if (bFull == true) {
      try {
        this.wait();
      } catch (Exception e) {}
    }
    this.name = name; // 虽然前面在等待，但等待完毕，这句话肯定会被执行的哦

而你新改的代码，和下面这个等价，请注意

  public synchronized void put2(String name, String sex) {
    if (bFull == true) {
      try {
        this.wait();
      } catch (Exception e) {}
    } else {
      this.name = name; // 及时等到了，这个代码还是不会被执行的，和你前一个代码比，问题就出现在这里了！
      try {
        Thread.sleep(1);
      } catch (Exception e) {}
      this.sex = sex;
      bFull = true;
      this.notify();
    }
  }

那个 out 我就不分析了！