Can I have a program with 2 sockets in Java? -

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this simple chat program in java. know can work done 1 socket wondering why not use 2 sockets?

this executes not work intended. kindly see code , find error. please me new this. server code below.

server.java

    import java.io.*;         import java.net.*;         public class server {         public static void main(string[] args)throws ioexception {         serversocket ss=new serversocket(10001);         socket s=ss.accept();         socket s1=new socket("localhost",10005);         datainputstream di=new datainputstream(s.getinputstream());         dataoutputstream dot=new dataoutputstream(s.getoutputstream());         bufferedreader br=new bufferedreader(new inputstreamreader(system.in));         string str1="",str="";         while(str1!="exit"){             str=(string)di.readutf();             system.out.println("message="+str);             system.out.println("enter message:");             str1=br.readline();             dot.writeutf(str1);             dot.flush();         }         di.close();         dot.close();         s1.close();         s.close();         ss.close();       }  }

client code below kindly tell problem. know can work done 1 socket trying why not use 2 sockets.

client.java

import java.io.*; import java.net.*; public class client {             public static void main(string[] args) throws ioexception{             serversocket ss;             ss = new serversocket(10005);             socket s=ss.accept();             socket s1=new socket("localhost",10001);             datainputstream di=new datainputstream(s.getinputstream());             dataoutputstream dot=new dataoutputstream(s1.getoutputstream());             bufferedreader br=new bufferedreader(new inputstreamreader(system.in));             string str="",str1="";             while(str1!="exit"){                 system.out.println("enter message:");                 str1=br.readline();                 dot.writeutf(str1);                 dot.flush();                 str=(string)di.readutf();                 system.out.println("message="+str);             }             dot.close();             di.close();             s1.close();             ss.close();         }     }

yes, can open (within reason) many sockets want single jvm.

the problem code you're using blocking api, meaning thread doesn't return call br.readline() , cannot more work (including waiting data on other sockets).

you've got couple of options:

  1. create thread per socket (being careful of resource limitations).
  2. use nio api inherently non-blocking.

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