public Procesos(String orden) throws IOException {
    Runtime rt = Runtime.getRuntime();
    p =rt.exec(orden);
}

public void write(String datos) {
    PrintStream ps=new PrintStream(p.getOutputStream(),true);
    ps.print(datos);
}

public String read() throws IOException {
    BufferedReader br;
    br = new BufferedReader(new InputStreamReader(p.getInputStream()));
    return br.readLine();
}

public void kill(){
    p.destroy();
}

BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
    String dato=br.readLine();
    System.out.println("hola "+dato);
}