Getting methods from a chosen file's class in java

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Java

reflection

Hi,

I'd like to get all the methods from a file (.text or .java), but I don't know the file's name yet (the user can choose it with jFileChooser). So I don't know the class's name. I have this code:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import javax.swing.JFileChooser;


public class Test {

   public static void main(String[] args) throws Throwable {

        JFileChooser fc = new JFileChooser();
        File f = null;
        if (fc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
            f = fc.getSelectedFile();
        }
        int errorCode = com.sun.tools.javac.Main.compile(new String[]{
                    "-classpath", "bin",
                    "-d", "../Tmp",
                    f.getAbsolutePath()});


        System.out.println("errorCode:" + errorCode);
        File classesDir = new File("../Tmp");


        ClassLoader parentLoader = Test.class.getClassLoader();

        URLClassLoader loader1 = new URLClassLoader(
                new URL[]{classesDir.toURL()}, parentLoader);

        BufferedReader br = new BufferedReader(new FileReader(f));
        String load = "";
        while ((load = br.readLine()) != null) {
            if (load.startsWith("package")) {
                load = load.replaceAll("package", "") + "." + f.getName().substring(0, f.getName().indexOf("."));
                load = load.replace(";", "").trim();
                break;
            }
        }
        Class cls1 = loader1.loadClass(load);
        Method[] methods = cls1.getDeclaredMethods();
        for (Method m : methods) {
            System.out.println(m.getName());
        }
    }
}

It works, if the class doesn't contains "extends", or uses another class's methods, but if it do, I get errors.
What should I do to fix these problems? I think it has to do something with "classpath" and "bin"