PipedInputStream && PipedOutputStream的使用问题

Question

初学java，下面是用多线程精神病医生的例子，（即两个线程对话，你一句，我一句...）程序编译，运行时没有反应，考虑了一下觉得是没有给管道种子，敢问要如何解决阿！import java.io.*;
public class Doctor extends Thread
{

  String name;
InputStream in;
OutputStream out;
Doctor(String name,InputStream in,OutputStream out)
{
this.name=name;
this.in=in;
this.out=out;
}
public static void main(String [] args) throws  Exception
{

PipedInputStream sin1=new PipedInputStream();
PipedOutputStream sout1=new PipedOutputStream(sin1);
PipedInputStream sin2=new PipedInputStream();
PipedOutputStream sout2=new PipedOutputStream(sin2);

Doctor dr1=new Doctor("Doctor1",sin1,sout2);
Doctor dr2=new Doctor("Doctor2",sin2,sout1);
dr1.start();
dr2.start();
}
public void run()
{ 
try
{
talk(in,out);
}
catch(Exception e)
{
}
}
  void talk(InputStream in,OutputStream out) throws  Exception
  {    
       BufferedReader rd=new BufferedReader(
                       new InputStreamReader(in));
        PrintWriter pw=new PrintWriter(
                       new OutputStreamWriter(out),true);
        pw.println("Hello"); 
         while(true)
        {
              String question=rd.readLine();
              reply(pw,question);

        }  }
    void reply(PrintWriter pw,String question) throws  Exception
        {
         Thread.sleep((int)Math.random()*1000);
             pw.println(question);

         }
}

Answer 1

运行后应该是在while里，你没有输出，“你一句，我一句”的情况虽然在进行，但你不知道罢了。