import java.io.*;
import java.lang.reflect.*;
import java.net.*;
import javax.tools.*;
 
 
public class Test15
{
	public static void main(String ... args)
	{
		try
		{
			String name = "HelloWorld1";
			String source = "public class HelloWorld1 implements MainClass{public void print(){System.out.println(\"hello world\");}}";
 
			MainClass instance = compile(name, source);
 
			instance.print();
 
			name = "HelloWorld2";
			source = "public class HelloWorld2 implements MainClass{public void print(){System.out.println(\"HELLO WORLD\");}}";
 
			instance = compile(name, source);
 
			instance.print();
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
 
	private static MainClass compile(String aName, final String aSource) throws Exception
	{
		FileOutputStream out = new FileOutputStream(aName + ".java");
		out.write(aSource.getBytes());
		out.close();
 
		SimpleJavaFileObject sourceFile = new SimpleJavaFileObject(aName, JavaFileObject.Kind.SOURCE)
		{
			public CharSequence getCharContent(boolean b) throws IOException
			{
				return aSource;
			}
			public InputStream openInputStream() throws IOException
			{
				return new ByteArrayInputStream(aSource.getBytes());
			}
			public OutputStream openOutputStream() throws IOException
			{
				throw new RuntimeException();
			}
		};
 
		JavaCompilerTool tool = ToolProvider.defaultJavaCompiler();
 
		tool.setOutputDirectory(new File("d:/java/src"));
 
		JavaCompilerTool.CompilationTask task = tool.run(null, sourceFile);
		task.run();
 
		if (!task.getResult())
		{
			for (DiagnosticMessage msg : task.getDiagnostics())
			{
				System.out.println(msg);
			}
		
			System.exit(-1);
		}
 
		Class clazz = Test15.class.getClassLoader().loadClass(aName);
		MainClass instance = (MainClass)clazz.newInstance();
 
		return instance;
	}
}
 
interface MainClass
{
	public void print();
}