Questions about java IO streams?

when getting console input through the IO input stream, it is found that most of them are written like this: 

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

what I want to ask is whether this paragraph can be written in the following form: 

BufferedReader br = new BufferedReader(new Reader(System.in));

Why is it necessary to convert console input to a character stream through a byte stream? Can"t you read it directly with a character stream and convert it to an advanced character stream?

Java
Jun.03,2021
BufferedReader br = new BufferedReader (new InputStreamReader (System.in));

System.in is a byte stream, bufferedReader is a character stream, and InputStreamReader is used to convert the System.in byte stream into a character stream.

BufferedReader br = new BufferedReader (new Reader (System.in));
Reader is an abstract class that cannot be directly new, so you need to use the Reader implementation class (subclass), while InputStreamReader is the Reader implementation class, and the function is to convert the byte stream into a character stream.

Previous: Can I use CSS to realize the relative position of two elements?

Next: [Mini Program] after the saveImageToPhotosAlbum is saved, why does the page refresh now? Can it not be refreshed?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3fb4b-ea05.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3fb4b-ea05.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?