リフレクションするやつ

ReflectionUtil.java

package net.firstspring.lib;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class ReflectionUtil
{

	@SuppressWarnings("unchecked")
	public static <T,E> E getField(Class<?> c, T instance, String field)
	{
		try
		{
			Field f = c.getDeclaredField(field);
			f.setAccessible(true);
			return (E)f.get(instance);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return null;
	}

	public static <T,E> E getField(T instance, String field)
	{
		return getField(instance.getClass(), instance, field);
	}

	public static <T,E> boolean setField(Class<?> c, T instance, String field, E value)
	{
		try
		{
			Field f = c.getDeclaredField(field);
			f.setAccessible(true);
			f.set(instance, value);
			return true;
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return false;
	}

	public static <T,E> boolean setField(T instance, String field, E value)
	{
		return setField(instance.getClass(), instance, field, value);
	}

	public static Method getMethod(Class<?> c, String method, Class<?>... argTypes)
	{
		try
		{
			Method m = c.getDeclaredMethod(method, argTypes);
			m.setAccessible(true);
			return m;
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return null;
	}

	@SuppressWarnings("unchecked")
	public static <T,E> E invoke(T instance, Method m, Object... args)
	{
		try
		{
			return (E)m.invoke(instance, args);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return null;
	}

}