Minecraft Server CMD

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Scanner;

class Printer extends Thread{
    BufferedReader printer;

    public Printer(Process targetCMD){
        printer = new BufferedReader(new InputStreamReader(targetCMD.getInputStream()));
    }

    public void run(){
        while(true){
            try {
                if(printer.ready())
                System.out.println(printer.readLine());
                else
                    try {
                        this.sleep(1);
                    } catch (InterruptedException e) {
                    }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

class Writer extends Thread{

    Scanner keybroad = new Scanner(System.in);
    BufferedWriter pw;

    public Writer(Process targetCMD){
        pw = new BufferedWriter(new OutputStreamWriter(targetCMD.getOutputStream()));
    }

    public void run(){
        try {
            while(true){
                pw.write(keybroad.nextLine());
                pw.newLine();
                pw.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

public class Rocket {
    static File local = new File(Rocket.class.getProtectionDomain().getCodeSource().getLocation().getPath());
    public static void main(String[] args) throws InterruptedException {

        System.out.println("<i> Launching java...");

        String localString = local.getAbsoluteFile().toString();
        ArrayList<String> arguments = new ArrayList<String>();
        arguments.add("java");
        arguments.add("-cp");
        arguments.add(localString);
        arguments.add("-jar");
        arguments.add(localString+"\\minecraft_server.1.7.4.jar");//here is minecraft_server.x.x.x.jar
        Process process = null;
        ProcessBuilder command = new ProcessBuilder(arguments);

        System.out.println("<i> start server...");
        try {
            process = command.start();

            Printer printer = new Printer(process);
            Writer writer = new Writer(process);
            printer.start();
            writer.start();

            process.waitFor();
            printer.stop();
            writer.stop();

            System.out.println("<i> press Enter to close");

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }




    }

}