Help needed about Java Threads ?

Question

Hi,
I have a p2p java program that contains many classes, A.java, B.java, etc. It works fine when i send or recieve to eachother one at a time, but I would like to be able to send/recieve things at the same time. So i would probably need to use Java Threads. Can somebody please show me how this is done. I would really appriciate it. Thanks!!
import java.net.*;
import java.io.*;
import java.lang.*;
public class A {
        private static String hostname; //host name
        public A () { }
       public static void send() throws IOException {
                //send code here
        public static void receive() throws IOException{               
                //receive code here
        public static void main(String args[]) throws IOException {
                //do both send/recieve at the same time?
                send();
                receieve();
}

Answer 1

Well, I think( this is comming out my rear ) that the scope of the recieve() call is not in the main method anymore but instead in class you've created with "new Thread()" and it's throwing from the public void run() instead. This is a good example of complicated code. I would do this:
(Untested code)
import java.net.*;
import java.io.*;
import java.lang.*;
public class A implements Runnable { // <--- NEW
        private static String hostname; //host name
        public A () { }
        public static void send() throws IOException {
                //send code here
        public static void receive() throws IOException{               
                //receive code here
        public static void main(String args[]) throws IOException {
                //do both send/recieve at the same time?
                new Thread( this ).start();
                send();
        /******** NEW ************/
        public void run()
            while( keepListening )
                // It's the assumption that recieve() is
                // throwing the IOException from some net calls
                try {
                   recieve();
                } catch( IOException ioe ) {
                   System.out.println( "IOException in run()\n" + ioe.getMessage();
}