return type generics java code example
Example 1: java return new instance of generic type
public static <E> void append(List<E> list, Class<E> cls) throws Exception {
E elem = cls.newInstance();
list.add(elem);
}
List<String> ls = new ArrayList<>();
append(ls, String.class);
Example 2: Java method that returns a generic type
public static <T> T getRandomValue(List<T> listOfPossibleOutcomes, int numPossibilities) {
int r = RandomNumberGenerator.getRandIntBetween(0, numPossibilities);
return listOfPossibleOutcomes.get(r);
}
public static <T> T getRandomValueFromGenericList(List<T> list) {
Collections.shuffle(list);
return list.get(0);
}