import java.io.*;
 
public class DoClass
{
	private void execute(String[] cmd)
	{
		String output = null;
		try
		{
			String line;
			Runtime rt = Runtime.getRuntime();
			Process process = rt.exec(cmd);
			InputStreamReader isr = new InputStreamReader( process.getInputStream() );
			OutputStreamWriter osw = new OutputStreamWriter( process.getOutputStream() );
 
			BufferedReader br = new BufferedReader( isr );
			BufferedWriter bw = new BufferedWriter( osw );
 
			while( ( line = br.readLine() ) != null )
			{
				System.out.println( line );
			}
 
			while( ( line = br.readLine() ) != null )
			{
				System.out.println( line );
			}
 
			int exitValue = process.waitFor();
			System.out.println( "ExitValue: " + exitValue );
		}
		catch (Throwable t)
		{
			t.printStackTrace();
		}
	}
 
	public void compileClass()
	{
		String cmd[] = new String[4];
		cmd[0] = "javac";
		cmd[1] = "-classpath";
		cmd[2] = System.getProperty("java.class.path");
		cmd[3] = "HelloWorld.java";
		System.out.println("Compiling Class...");
		execute(cmd);
	}
 
	public void runClass()
	{
		String cmd[] = new String[4];
		cmd[0] = "java";
		cmd[1] = "-classpath";
		cmd[2] = System.getProperty("java.class.path");
		cmd[3] = "HelloWorld";
		System.out.println("Running Class...");
		execute(cmd);
	}
 
	public static void main(String s[])
	{
		DoClass doer = new DoClass();
		doer.compileClass();
		doer.runClass();
	}
}

class HelloWorld
{
   public static void main(String args[])
   {
	   System.out.println("Ran HelloWorld!");
   }
}