Go语言视频零基础入门到精通

蚂蚁先生 · 发表于 2014-12-19 09:38:12

下面两组代码，区别在"烤鸭"的写法，为什么这两种写法输出的结果不一样？希望回答的人先分别把这两组代码复制粘贴进txt编译启用后再回答我的问题，谢谢。第二组代码是我希望的结果。但为什么第一组代码的输出结果会是那样的呢？
第一组
class Resource
{
private String name="烤鸭";
private int count = 1;
private boolean flag = false;
public synchronized void set()
{

        while (flag)
        {
        try
        {
        this.wait();
        }
        catch (InterruptedException e)
        {

}
}

this.name = name + count;
        count++;
        System.out.println(Thread.currentThread().getName()+"生产..."+this.name);

flag = true;
        this.notifyAll();

}

public synchronized void out()
{
      while (!flag)
      {
            try
            {
                  this.wait();
            }
            catch (InterruptedException e)
            {

}
        }

        System.out.println(Thread.currentThread().getName()+"消费......"+this.name);

        flag = false;
        this.notifyAll();
}

}

class Producer implements Runnable
{
Resource r;
Producer(Resource r)
{
        this.r = r;
}

public void run()
{
        while (true)
        {
                r.set();
        }

}
}

class Consumer implements Runnable
{
Resource r;
Consumer(Resource r)
{
        this.r = r;
}

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

}
}

class ProducerConsumerDemo2
{
public static void main(String[] args)
{
        Resource r = new Resource();
        Producer p = new Producer(r);
        Consumer c = new Consumer(r);

Thread t0 = new Thread(p);
        Thread t1 = new Thread(p);
        Thread t2 = new Thread(c);
        Thread t3 = new Thread(c);

t0.start();
        t1.start();
        t2.start();
        t3.start();
}
}class Resource
{
private String name;
private int count = 1;
private boolean flag = false;

}

class Producer implements Runnable
{
Resource r;
Producer(Resource r)
{
        this.r = r;
}

public void run()
{
        while (true)
           {
                   r.set("烤鸭");
           }

}
}

第二组
class Resource
{
private String name;
private int count = 1;
private boolean flag = false;
public synchronized void set()
{
      while (flag)
      {
         try
         {this.wait();}
         catch (InterruptedException e){}
      }
this.name =name + count;
count++;
System.out.println(Thread.currentThread().getName()+"生产..."+this.name);
flag = true;

this.notifyAll();
}
public synchronized void out()
{
      while (!flag)
      {
         try
         {
            this.wait();
         }
         catch (InterruptedException e)
         {

}
      }
System.out.println(Thread.currentThread().getName()+"消费......"+this.name);
flag = false;
this.notifyAll();
}
}
class Producer implements Runnable
{
Resource r;
Producer(Resource r)
{
      this.r = r;
}

public void run()
{
      while (true)
      {
         r.set("烤鸭");
      }
}
}

class Consumer implements Runnable
{
Resource r;
Consumer(Resource r)
{
      this.r = r;
}

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

}
class ProducerConsumerDemo2
{
public static void main(String[] args)
{
      Resource r = new Resource();
      Producer p = new Producer(r);
      Consumer c = new Consumer(r);

Thread t0 = new Thread(p);
      Thread t1 = new Thread(p);
      Thread t2 = new Thread(c);
      Thread t3 = new Thread(c);

t0.start();
      t1.start();
      t2.start();
      t3.start();
}
}

蚂蚁先生 · 发表于 2014-12-20 00:18:00

没有人知道吗

蚂蚁先生 · 发表于 2014-12-21 14:51:20

求高手指点

hbh820326 · 发表于 2015-2-12 00:17:58

给你改一下，你没传参，却用了name和this.name所以它们指向同一个对象，等效于name+=count;
不知道楼主能不能理解？
class Resource{
private String name;
private int count = 1;
private boolean flag = false;
public synchronized void set(){
while (flag)
try{
this.wait();
}catch (InterruptedException e){
}
name = "烤鸭" + count;
count++;
System.out.println(Thread.currentThread().getName()+"生产..."+name);
flag = true;
this.notifyAll();
}
public synchronized void out(){
while (!flag){
try{
this.wait();
}catch (InterruptedException e){
}
}
System.out.println(Thread.currentThread().getName()+"消费......"+name);
flag = false;
this.notifyAll();
}
}
class Producer implements Runnable{
Resource r;
Producer(Resource r)
{
this.r = r;
}

public void run()
{
while (true)
{try {
Thread.sleep(1000);
} catch (Exception e) {}
r.set();
}

}
}

class Consumer implements Runnable
{
Resource r;
Consumer(Resource r)
{
this.r = r;
}

public void run()
{
while (true)
{try {
Thread.sleep(1000);
} catch (Exception e) {}
r.out();
}

}
}

class jh
{
public static void main(String[] args)
{
Resource r = new Resource();
Producer p = new Producer(r);
Consumer c = new Consumer(r);

Thread t0 = new Thread(p);
Thread t1 = new Thread(p);
Thread t2 = new Thread(c);
Thread t3 = new Thread(c);

t0.start();
t1.start();
t2.start();
t3.start();
}

hbh820326 · 发表于 2015-2-12 09:36:40

看我给你精简后的等效代码

class l implements Runnable{
int c;
boolean b,f;
public static void main(String[]args){
new l();
}
l(){
for(int i=0;i<6;i++)new Thread(this).start();
}
public void run(){
try{
if(b=!b)while(true){o();Thread.sleep(500);}
else while(true){i();Thread.sleep(500);}
}catch(Exception e){}
}
synchronized void i(){
while(f)try{wait();}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"生产...烤鸭"+(++c));
f=!f;
notifyAll();
}
synchronized void o(){
while(!f)try{wait();}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"消费......烤鸭"+c);
f=!f;
notifyAll();
}
}

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