Win a copy of Escape Velocity: Better Metrics for Agile Teams this week in the Agile and Other Processes forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Tim Cooke
  • Paul Clapham
  • Jeanne Boyarsky
Sheriffs:
  • Ron McLeod
  • Frank Carver
  • Junilu Lacar
Saloon Keepers:
  • Stephan van Hulst
  • Tim Moores
  • Tim Holloway
  • Al Hobbs
  • Carey Brown
Bartenders:
  • Piet Souris
  • Frits Walraven
  • fred rosenberger

Menu question

 
Greenhorn
Posts: 11
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
In the following program the user has a simple menu with 3 choices. Two choices (a & b) will run specific methods and the final choice will quit the program. Is there a simple way to ask the user to press a key (once the called method is done) to return to the main menu, rather than returning automatically?

 
Bartender
Posts: 1844
Eclipse IDE Ruby Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
From a command line, you can't get press ANY key, but you can do press ENTER to continue.



The reason that you can't do any key is that System.in doesn't actually get anything from the commandline until enter is pressed.
 
Ranch Hand
Posts: 1211
Mac IntelliJ IDE
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
That got me interested...after a bit of googling, this is what I can find -

http://www.javakb.com/Uwe/Forum.aspx/java/3108/JAVA-Unbuffered-access-to-stdin


I'll interpret that to mean that you want to be able to read from
System.in without waiting for the user to press enter - is that right?
If so, it's your OS console, not Java's buffering of System.in that
prevents it, and consequently unbuffering System.in (alone) won't let
you do it.

On unix-like platforms, you can use "stty -icanon min 1" to change
console mode so you can do character-at-a-time input. On other
operating systems, I have no idea.



I tried a few different combinations of input streams, only after using 'stty -icanon min 1' can I read input without waiting for an 'Enter'. This is on linux.

Is this kind of 'unbuffered' input from console enabled by default on windows? I remember writing C programs to read standard input without waiting for an 'Enter' on windows systems.
 
These are not the droids you are looking for. Perhaps I can interest you in a tiny ad?
Garden Master Course kickstarter
https://coderanch.com/t/754577/Garden-Master-kickstarter
reply
    Bookmark Topic Watch Topic
  • New Topic