How do I change directory?

Question

How do I change directory? I mean something like "cd .."
Thanks
H.

Answer 1

//Author: Richard Focke :)
import java.io.*;
class RuntimeExec{
     private static boolean quit;
     public static void main(String[]args)throws IOException{
          if(args.length<1){
               System.out.println("Type in program to run");
               System.exit(1);
          quit = false;
          Runtime run = Runtime.getRuntime();
          Process newProcess = run.exec(args[0]);
          if(newProcess!=null){
               BufferedReader  br = new BufferedReader(new InputStreamReader(newProcess.getInputStream()));
               PrintWriter os = new PrintWriter(newProcess.getOutputStream());
               BufferedReader  be = new BufferedReader(new InputStreamReader(newProcess.getErrorStream()));
               if(br!=null)(new ReadThread(br)).start();
               if(os!=null)(new WriteThread(os)).start();
               if(be!=null)(new ErrorThread(be)).start();
               try{
                    newProcess.waitFor();
               }catch(InterruptedException ie){}
          }else
               System.out.println("Error creating process");
          newProcess.destroy();
          quit = true;
          System.out.println("Done!");
          System.exit(0);     
     private static class ReadThread extends Thread{
          private BufferedReader is;
          public ReadThread(BufferedReader is){
               this.is = is;
          public void run(){
               String s;
               while(!quit){
                    try{
                         s=is.readLine();
                         if(s!=null)
                         System.out.println(s);
                    }catch(IOException e){}
     private static class WriteThread extends Thread{
          private PrintWriter br;
          private BufferedReader ss;
          public WriteThread(PrintWriter br){
               this.br = br;
               ss = new BufferedReader(new InputStreamReader(System.in));
          public void run(){
               String s;
               while(!quit){
                    try{
                         s=ss.readLine();
                         if(s!=null)
                         br.println(s);
                    }catch(IOException e){}
     private static class ErrorThread extends Thread{
          private BufferedReader br;
          public ErrorThread(BufferedReader br){
               this.br = br;
          public void run(){
               while(!quit){
                    String s;
                    try{
                         s=br.readLine();
                         if(s!=null)
                         System.err.println(s);
                    }catch(IOException e){}
}