How to readLine with echo in Java?

I would like to use a BufferedReader with a kind of readLine() (or similar) that can return an echo for every keystroke pressed.

It's for a remote terminal. Other way to ask it is how is implemented a console in java.

This is what came to mind but is too ugly. 开发者_JAVA百科Is there any known library that implement something like this?

while(condition) {

    nByteRead = in.read(buffer);

    if (nByteRead != -1) {

        //  ECHO
        out.write(buffer, 0, bytes_read);                      

        //  read bytes till NEW_LINE...                            
        //  etc...!                            
    }                           
}                    

Of course I could encapsulate this behaviour in some thread and go on with a library for this, I just wonder if there is some wheel already invented.

Thanks for any hint!

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Most terminals, including the default terminals in Ubuntu and Windows (I believe) won't pass on the characters to the JVM until the user hits return. (I.e., it is buffered on a full-line basis on a lower level in the system.)

If you need to read one character at a time from the terminal, you'll have to go with a lower level system library.

Related question:

• Why can't we read one character at a time from System.in?

(disclamer, I'm not completely sure I understood your question correctly.)

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There's:

• JLine: http://jline.sourceforge.net/
• Java Curses: http://sourceforge.net/projects/javacurses/