java generic type method

1// generic methods
2
3public <T> List<T> fromArrayToList(T[] a) {   
4	    return Arrays.stream(a).collect(Collectors.toList());
5	}
6
7public static <T, G> List<G> fromArrayToList(T[] a, Function<T, G> mapperFunction) {
8	    return Arrays.stream(a)
9	      .map(mapperFunction)
10	      .collect(Collectors.toList());
11	}
12
13// bounded generics
14
15public <T extends Number> List<T> fromArrayToList(T[] a) {
16	    ...
17	}
18
19//multiple bounds
20
21<T extends Number & Comparable>
22
23// upper bound wildcards
24
25public static void paintAllBuildings(List<? extends Building> buildings) {
26	    ...
27	}
28    
29// lower bound wildcard
30
31<? super T>

1public static <T> T getRandomValue(List<T> listOfPossibleOutcomes, int numPossibilities) {
2    int r = RandomNumberGenerator.getRandIntBetween(0, numPossibilities);
3    return listOfPossibleOutcomes.get(r);
4}
5
6public static <T> T getRandomValueFromGenericList(List<T> list) {
7    Collections.shuffle(list);
8    return list.get(0);
9}