/* <!-- in case someone opens this in a browser... --> <pre> */
/*
 * An example of using reflection to get information about
 * a named Java class, even if that class hasn't already
 * been loaded. This is handy for getting some information
 * about a class that you don't have any documentation for.
 *
 * In this implementation, the class you're looking at must
 * be on your CLASSPATH, and you must use the full name of
 * the class (i.e. java.lang.String instead of just String).
 */
import java.lang.reflect.*;

public class ReflectClass  {
	static String indent = "  ";
	
	public static void main (String args[])
	{
		if (args.length == 0) {
			System.out.println("USAGE: java ReflectClass className");
			return;
		}
		
		try {
			// you can use a ClassLoader to get an instance of the Class,
			// or you can use the Class.forName() method
			//ClassLoader cl = new ReflectClass().getClass().getClassLoader();
			//Class cls = cl.loadClass(args[0]);
			Class cls = Class.forName(args[0]);
			printClassInfo(cls);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	public static void printClassInfo (Class cls)
	{
		System.out.println("Reflected information about " + cls.getName() + ":");
		System.out.println(cls);
		System.out.println("Extends: " + cls.getSuperclass().getName());
		
		Class[] inters = cls.getInterfaces();
		if (inters.length > 0) {
			System.out.print("Implements: ");
			for (int i = 0; i < inters.length; i++)
				System.out.print((i > 0 ? ", " : "") + inters[i].getName());
			System.out.println("");
		}
		
		System.out.println("");
		
		// public fields
		System.out.println("FIELDS:");
		Field[] fields = cls.getFields();
		for (int i = 0; i < fields.length; i++)
			System.out.println(indent + fields[i]);
		
		// constructors
		System.out.println("CONSTRUCTORS:");
		Constructor[] cons = cls.getConstructors();
		for (int i = 0; i < cons.length; i++)
			System.out.println(indent + cons[i]);
		
		// public methods
		System.out.println("METHODS:");
		Method[] methods = cls.getMethods();
		for (int i = 0; i < methods.length; i++)
			System.out.println(indent + methods[i]);
	}
}