import java.io.*;
import java.net.*;
import java.lang.reflect.*;

public class javaShell
{
//--------------------------------------------------------------------------------
public static void main( String[] args )
throws Exception
{
String javaHome = System.getProperty( "java.home" );
File tools = new File( javaHome + "/../lib/tools.jar" );
if( !tools.exists() )
	{
	System.out.println( "tools.jar not found." );
	return;
	}

String classStr = "public class otf { public String toString() { try { CODE } catch( Throwable e ) { e.printStackTrace(); } return \"\"; } }";
BufferedReader reader = new BufferedReader( new InputStreamReader( System.in, "ISO_8859_1" ) );
StringBuffer buf = new StringBuffer();
while( true )
	{
	String line = reader.readLine();
	if( line == null || line.equalsIgnoreCase( "quit" ) || line.equalsIgnoreCase( "exit" ) )
		{
		break;
		}
	else if( line.equals( "" ) )
		{
		exec( classStr, buf.toString() );
		buf = new StringBuffer();
		}
	buf.append( line );
	}
}
//--------------------------------------------------------------------------------
private static void exec( String classStr, String userStr )
throws Exception
{
	//Generate java source
String className = "otf_" + System.currentTimeMillis();
String javaFileName = className + ".java";
classStr = replaceAll( classStr, "CODE", userStr );
classStr = replaceAll( classStr, "public class otf", "public class " + className  );
saveStringToFile( classStr, javaFileName );

	//Compile
String javaHome = System.getProperty( "java.home" );
File tools = new File( javaHome + "/../lib/tools.jar" );
String toolsFileName = tools.getCanonicalPath();

URL toolsURL = new URL( "file:" + toolsFileName );
URLClassLoader cl = new URLClassLoader( new URL[]{ toolsURL } );
Class javac = cl.loadClass( "com.sun.tools.javac.Main" );
Method m = javac.getDeclaredMethod( "compile", new Class[]{ String[].class } );

String[] args = new String[]{ javaFileName  };

Object result = m.invoke( null, new Object[]{ args } );
int resultInt = ( ( Integer )result ).intValue();

if( resultInt != 0 )
	{
	System.out.println( "Compilation error." );
	return;
	}

	//Execute
Class otfClass = cl.loadClass( className );
Object o = otfClass.newInstance();
o.toString();
}
//--------------------------------------------------------------------------------
public static String replaceAll( String target, String from, String to )
{
int len = from.length();
if( len == 0 )
	{
	return target;
	}
StringBuffer buf = new StringBuffer( target.length() );
while( true )
	{
	int pos = target.indexOf( from );
	if( pos == -1 )
		{
		break;
		}
	buf.append( target.substring( 0, pos ) );
	buf.append( to );
	target = target.substring( pos + len );
	}
buf.append( target );
return buf.toString();
}
//--------------------------------------------------------------------------------
public static void saveStringToFile( String str, String fileName )
throws IOException
{
OutputStream os = new FileOutputStream( fileName );
try
	{
	os.write( str.getBytes( "ISO-8859-1" ) );
	}
finally
	{
	os.close();
	}
}
// --------------------------------------------------------------------------------
}