NamedParam.java

public enum NamedParam {
	A(new Param1(1), new Param2("hoge")), B(new Param1(10), new Param2("fuga"));

	X(Param1 p1, Param2 p2) {
		this.p1 = p1.value;
		this.p2 = p2.value;
	}

	public final int p1;
	public final String p2;

	protected static class Value<T> {
		public Value(T value) {
			this.value = value;
		}

		public final T value;
	}

	protected static class Param1 extends Value<Integer> {
		public Param1(int x) {
			super(x);
		}
	}

	protected static class Param2 extends Value<String> {
		public Param2(String x) {
			super(x);
		}
	}
}