Runtime#exec()と標準出力/エラーについて

public class Command{
  public static void main(String[] args){
    Runtime runtime = Runtime.getRuntime();
    Process process = null;
    
    try{
      Thread stOut = new ReadConsole("STDOUT");
      Thread stErr = new ReadConsole("STDERR");
      process = runtime.exec(args);
      ((ReadConsole)stdOut).setIs(process.getInputStream);
      ((ReadConsole)stdOut).setIs(process.getErrorStream);
      stOut.start();
      stErr.start();
      process.waitFor();
      int value = process.exitValue();
      System.out.priintln("リターンコード=" + value);
    }catch(Exception e){
    }
  }
}

class ReadConsole extends Thread{
  private InputStream is = null;
  private String type = null;

  public ReadConsole(String type){
    this.type = type;
  }
  public void run(){
    BufferedInputStream bufIs = null;
    byte[] bytes = new byte[50];

    try{
      bufIs = new BufferedInputStream(this.is);
      while(bufIs.read(bytes, 0, 49){
        System.out.println(this.type + " : " + new String(bytes));
      }
    }catch(Exception e){
    }finally{
      try{
        bufIs.close();
        this.is.close();
      }catch(Exception e){
      }
    }
  }

  public void setIs(InputStream is){
    this.is = is;
  }
}