List<String> list = new ArrayList<>();
list.add("Apple");
list.add("Banana");
list.add("Orange");
System.out.println(list);
[Apple, Banana, Orange]
Set<String> set = new HashSet<>();
set.add("Apple");
set.add("Banana");
set.add("Orange");
System.out.println(set);
[Apple, Banana, Orange]
Map<String, Integer> map = new HashMap<>();
map.put("Apple", 3);
map.put("Banana", 5);
map.put("Orange", 2);
System.out.println(map);
{Apple=3, Banana=5, Orange=2}
