process - make a simple java program that runs command prompt commands from the java program somewhat similar to jCreator -

i trying make simple java program runs command prompt commands java program similar jcreator.in here wanted compile , run relavant main class.

this code.but don't work properly.but out asking keyboard input program runs properly. please give me help.

my code is

   import java.io.*;  public class {    private static void printlines(string name, inputstream ins) throws exception {     string line = null;     bufferedreader in = new bufferedreader(         new inputstreamreader(ins));     while ((line = in.readline()) != null) {         system.out.println(line);     }   }    private static void runprocess(string command) throws exception {     process pro = runtime.getruntime().exec(command);     printlines(command + " stdout:", pro.getinputstream());     printlines(command + " stderr:", pro.geterrorstream());     pro.waitfor();    }    public static void main(string[] args) {     try {       runprocess("javac main.java");       runprocess("java main");     } catch (exception e) {       e.printstacktrace();     }   } } 

my main class

import java.util.*;  public class main {   public static void main(string[] args) {     scanner input = new scanner(system.in);      int x = input.nextint();      system.out.println(x);       system.out.println("s");      system.out.println("ok");    } }