[Java8] Map을 Set으로 변환 (Map to Set)
✍️ Map to Set 1. Simple Loop Map map = new HashMap(); map.put(1, "이말년"); map.put(2, "침착맨"); map.put(3, "주호민"); Set ids = new HashSet(); for (int id : map.keySet()) { ids.add(id); } Set names = new HashSet(); for (String name : map.values()) { names.add(name); } System.out.println(ids); System.out.println(names); // [1, 2, 3] // [침착맨, 이말년, 주호민] 2. Constructor Map map = new HashMap(); map.put(1, "..