how to execute dos commands using java [ Runtime.getRuntime().exec("cmd.exe /c ") ]

hi how to achive the following ..

try {
      String Arr[] = {"cmd", "/c","dir","cd C:\\test", "dir"};  

              Process p = Runtime.getRuntime().exec(Arr);
              read(p);
              OutputStream oStream = p.getOutputStream();
              BufferedWriter sWriter = new BufferedWriter(new OutputStreamWriter(oStream));
              sWriter.write("cls");
              sWriter.newLine();
              sWriter.write("dir");
              sWriter.newLine();
              sWriter.write("cd C:/test/hello");
              sWriter.newLine();
              sWriter.write("dir /w");
              sWriter.flush();
              sWriter.close();
              oStream.close();
              read(p);          } catch (IOException e) {
              e.printStackTrace();
          }


private static void read(Process p)
      {
          try{
                String line = null;
                
              
            
              BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
              while((line=input.readLine()) != null) {
                  System.out.println(line);
              }
            

          }
          catch(IOException e1) { e1.printStackTrace(); }
      }