자바 혼성 컨테이너

public static <T> List<T> get(Class<List<T>> class1, Map<Class<?>, List<?>> map){

@SuppressWarnings("unchecked")

List<T> cast = (List<T>) class1.cast(map.get(class1));

return cast;

}

public void testHete() throws Exception {

Map<Class<?>, List<?>> map = new HashMap<Class<?>, List<?>>();

List<String> sList = new ArrayList<String>();

List<Integer> iList = new ArrayList<Integer>();

sList.add("a");

sList.add("b");

iList.add(new Integer(10));

iList.add(new Integer(20));

map.put(String.class, sList);

map.put(Integer.class, iList);

List<String> aa = List.class.cast(map.get(String.class));

for (String element : aa) {

System.out.println(element);

}

List<Integer> bb = List.class.cast(map.get(Integer.class));

for (Integer k : bb) {

System.out.println(k);

}

List<String> foo = Debug.<String>get(List<String>.class, map);

List<Integer> bar = Debug.get(List<Integer>.class, map);

bar.add(new Integer(30));

for (Integer i : bar) {

System.out.println(i);

}

MyClass<String> a = new MyClass<String>();

String oo = a.createContents(String.class);

BoxImpl<String> myBox = BoxImpl.<String>make();

}

public static class BoxImpl<T>{

public static<V> BoxImpl<V> make(){

return new BoxImpl<V>();

}

}

private static class MyClass<E>{

public MyClass() {

// TODO Auto-generated constructor stub

}

E createContents(Class<E> clazz){

try {

return clazz.newInstance();

} catch (InstantiationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

@Override

public String toString() {

// TODO Auto-generated method stub

return "HooneyWorld";

}

}