【Java基础】基础知识点

1. String装换为Java输入流

   InputStream is = new ByteArrayInputStream(text.getBytes("UTF-8"));

2. List转换为Map

   private Map<String, User> listToMap(List<User> userList) {
       return userList
               .stream()
               .collect(Collectors.toMap(User::getUserName, x -> x));
   }
   
   class User {
       @Getter
       @Setter
       String userName;
       @Getter
       @Setter
       String address;
   }