ジェネリックなListの詰替えサンプル

GenericListConverterSample

public static <T,U> List<U> hoge(List<T> in) {
	class InstanceGenerator<X> {
		X instance(X ... x) throws InstantiationException, IllegalAccessException {
			Class<?> xArrayClass = x.getClass();
			Class<X> xClass = (Class<X>) xArrayClass.getComponentType();
			return xClass.newInstance();
		}
	}
	InstanceGenerator<U> d = new InstanceGenerator<U>();
	List<U> out = new ArrayList<U>();
	try {
		for (T t : in) {
			U u = d.instance();
			// TODO t->u
			out.add(u);
		}
	} catch (InstantiationException e) {
		throw new IllegalArgumentException(e);
	} catch (IllegalAccessException e) {
		throw new IllegalArgumentException(e);
	}
	return out;
}