Make the console wait for a user input to close

Question

I have a console application that after performing its tasks  must give feedback to the user  such as  operation completed  or  operation failed  and the detailed error   The thing is  if I just  let it run   the output message will be printed but the console will close shortly afterwards  leaving no time to read the message   As far as I remember  in C    every console application will end with a  press any key to exit  or something like that  In C  I can simulate this behavior with a   Console ReadKey      But how can I do it in Java  I m using the Scanner class  but given that  input  is my instance of Scanner   input next   System exit 0      Any key  will work  except for return  which is quite a big deal here  Any pointers

User · Answer

public static void main String args          Scanner s   new Scanner System in        System out println  Press enter to continue              s nextLine           This nextline is a pretty good option as it will help us run next line whenever the enter key is pressed

User · Answer

A simple trick   import java util Scanner        Add these codes at the end of your method        Scanner input   new Scanner System in   System out print  Press Enter to quit       input nextLine

User · Answer

The problem with Java console input is that it s buffered input  and requires an enter key to continue   There are these two discussions  Detecting and acting on keyboard direction keys in Java and Java keyboard input parsing in a console app  The latter of which used JLine to get his problem solved   I personally haven t used it

User · Answer

I d like to add that usually you ll want the program to wait only if it s connected to a console  Otherwise  like if it s a part of a pipeline  there is no point printing a message or waiting  For that you could use Java s Console like this   import java io Console         public static void waitForEnter String message  Object    args        Console c   System console        if  c    null               printf-like arguments         if  message    null              c format message  args           c format   nPress ENTER to proceed  n            c readLine

User · Answer

I used simple hack  asking windows to use cmd commands   and send it to null      Class for Different hacks for better CMD Display import java io IOException  public class CMDWindowEffets       public static void getch   throws IOException  InterruptedException               new ProcessBuilder  cmd     c    pause  gt  null   inheritIO   start   waitFor

User · Answer

In Java this would be System in read

User · Answer

I ve put in what x4u said  Eclipse wanted a try catch block around it so I let it generate it for me   try           System in read          catch  IOException e               TODO Auto-generated catch block         e printStackTrace            It can probably have all sorts of bells and whistles on it but I think for beginners that want a command line window not quitting this should be fine   Also I don t know how common this is  this is my first time making jar files   but it wouldn t run by itself  only via a bat file   java exe -jar mylibrary jar   The above is what the bat file had in the same folder  Seems to be an install issue   Eclipse tutorial came from  http   eclipsetutorial sourceforge net index html  Some of the answer also came from  Oracle Thread

User · Answer

You can just use nextLine    as pause  import java util Scanner       Scanner scan   new Scanner System in    void Read          System out print  Press any key to continue                scan nextLine        However any button you press except Enter means you will have to press Enter after that but I found it better than scan next

[java] Make the console wait for a user input to close

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