Java Chat Processor Alpha

import java.net.*;
import java.io.*;

import java.lang.*;     //for Runtime

public class ChatPt {
    private static final int WAITING = 0;
    private static final int SENTWELCOME = 1;
    private static final int SENTLIST = 2;
    private static final int BYE = 3;
    private static final int LS = 4;


//    private static final int NUMJOKES = 5;

    private int state = WAITING;

    private String[] files = { "Nothing"};
    private String tempcommand;
    Runtime tempRuntime;
    Process tempProcess;

    public String processInput(String theInput)
    {

        String theOutput = null;

        if (state == WAITING)
        {
            theOutput = "Welcome to ChatServe .001";
            state = SENTWELCOME;
        }
        else if (state == SENTWELCOME)
        {
            if(theInput.equalsIgnoreCase("LS"))
            {
                tempRuntime.getRuntime();
                tempcommand = "dir";

                try {
                    tempProcess = tempRuntime.exec("ls");
                    } catch (IOException e)
                        {
                    System.err.println("something's fucked up");
                    System.exit(1);
                        }


                theOutput = tempProcess.getOutputStream();
//              theOutput = files[0];
                state = SENTLIST;
            }
            else
            {
                theOutput = "I can only list my files, type 'LS'";
            }
        }
        else if (state == SENTLIST)
        {
            theOutput = "I already sent you the file list! now leave!";
            state = BYE;
        }
        else
        {
            theOutput = "Bye.";
            state = WAITING;
        }

        return theOutput;
    }
}