package test;

import java.io.*;
import java.util.GregorianCalendar;

import javassist.*;

public class JAVASSIST_HelloWorldBuilder {

	public static void main( String[] args ) 
	{
		
		try {
			double startTime = new GregorianCalendar().getTimeInMillis();
			CtClass helloClass = ClassPool.getDefault().makeClass("HelloWorld");
			
			CtMethod m = CtNewMethod.make(
				"public static void main(String[] argv) { " +
				"java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(System.in)); " +
				"java.lang.String name = null; " +
				"try { " +
				"	System.out.print(\"Please enter your name> \"); " +
				"	name = in.readLine(); " +
    			"} catch(java.io.IOException e) { return; } " +
    			"System.out.println(\"Hello, \" + name); }", helloClass);
			helloClass.addMethod(m);
			

			double endTime = new GregorianCalendar().getTimeInMillis();
			System.out.println("Class created in " + (endTime-startTime) + " ms");
			
			
			File f = new File("HelloWorld.class");
			helloClass.toBytecode(new DataOutputStream(new FileOutputStream(f)));
			
		} catch( CannotCompileException e ) {
			e.printStackTrace();
		} catch( IOException e ) {
			e.printStackTrace();
		}
	}
}