如何优雅的写好Java Code

Map 初始化

通常程序员初始化Map

Map<String, Object> map = new HashMap<>();
map.put("key", 2);

二般程序员初始化Map

Map<String, Object> map = new HashMap<>(){{
	put("key", 2);
}};

懒惰的程序员

Map<String, Object> map = Collections.singletonMap("key", 2);