How can I have threads communicate with each other?

Question

I'm working on a project that requires a group of classes communicating with each other. I decided on using a server and carrying out communication that way. However, my app only has communication between the client and server. I need the clients to be able to communicate with each other. Does anyone know how I can do this or point me to a good tutorial?

Answer 1

Sorry, here's a bone stock example of my server and client:
<SERVER>
package testserver;
import java.io.*;
import java.net.*;
import java.util.*;
public class TestServer
static int portOpen;
public static void main(String[] args)
portOpen=4000;
try
ServerSocket portListener = new ServerSocket(portOpen);
TestServer userThreads = new TestServer();
while (1==1)
Socket userConnection=portListener.accept();
userThreads.new PortConnection(userConnection);
catch (Exception e)
System.out.println("The server encountered a serious error. Server shut down.");
e.printStackTrace();
System.exit(0);
class PortConnection extends Thread
//Declare variables to handle connections.
Socket ourConnection;
BufferedReader serverInput;
PrintWriter serverOutput;
PortConnection(Socket userConnection)
try
ourConnection=userConnection;
serverInput=new BufferedReader(new InputStreamReader(userConnection.getInputStream()));
serverOutput=new PrintWriter(userConnection.getOutputStream(),true);
start();
catch (Exception e)
System.out.println("An error occurred when a user attempted a connection.");
public void run()
serverOutput.println("Welcome to the Server.");
try
serverOutput.close();
serverInput.close();
ourConnection.close();
catch (Exception e)
</SERVER>
<CLIENT>
package testclient;
import java.io.*;
import java.util.*;
import java.net.*;
public class TestClient {
static BufferedReader userInput;
static Socket quizServer;
static BufferedReader serverInput;
static PrintWriter serverOutput;
static String serverData;
public static void main(String[] args) {
userInput = new BufferedReader(new InputStreamReader(System.in));
try {
quizServer=new Socket("localhost",4000);
catch (Exception e) {}
try
serverInput=new BufferedReader(new InputStreamReader(quizServer.getInputStream()));
serverOutput=new PrintWriter(quizServer.getOutputStream(),true);
catch (Exception e) {}
try {
serverData=serverInput.readLine();
catch (Exception e) {}
System.out.println(serverData);
</CLIENT>