stream的groupingBy分組、按條件去重、filter過濾、sorted排序(reversed倒序)隨筆demo

List<UserInfo> filterUserList = new ArrayList<>(); filterUserList.add(new UserInfo("學生", "張三", 18)); List<UserInfo> userList = new ArrayList<>(); userList.add(new UserInfo("學生", "張三", 18)); userList.a

>>阅读原文<<