gistfile1.txt

import java.lang.reflect.ParameterizedType;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Main {

	/**
	 * @param args
	 */
	private List<String> list;
	private Set<Integer> set;
	private Map<String, Long> map;

	public static void main(String[] args) {
		System.out.println("Hello world!");
		ParameterizedType listPt;
		try {
			listPt = (ParameterizedType) Main.class.getDeclaredField("list")
					.getGenericType();
			System.out.printf("list: %s\n",
					listPt.getActualTypeArguments()[0].toString());
			ParameterizedType setPt = (ParameterizedType) Main.class
					.getDeclaredField("set").getGenericType();
			System.out.printf("set: %s\n",
					setPt.getActualTypeArguments()[0].toString());
			ParameterizedType mapPt = (ParameterizedType) Main.class
					.getDeclaredField("map").getGenericType();
			System.out.printf("map: %s, %s\n",
					mapPt.getActualTypeArguments()[0].toString(),
					mapPt.getActualTypeArguments()[1].toString());
		} catch (NoSuchFieldException | SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}