[Drjava-users] Keyboard Input with the Interactions window

[Carl P. <C.J...@hu...>]

Dear all,
   I'm having problems using some code to simplify keyboard input for my 
students (Dr.Java version 20020814-0343; JDK 1.3.1; OS Mac OSX 10.2.1 - 
reported problems are also verified on a Solaris setup).

   The code I'm using is as follows:

public class read {

   static public int getInt(String prompt) {
     System.out.print(prompt);
     BufferedReader In = new BufferedReader(new 
InputStreamReader(System.in));
     while (true) {
       try {
         System.out.print("[GetInt]");
         String s = (In.readLine()).trim();
         int y = (new Integer(s)).intValue();
         return y;
       } catch (Exception e) {
         System.out.println("Incorrect input format, please enter again: 
");
       }
     }
   }

}

   and the following is typed into the interactions pane:

int x = read.getInt("enter: ");

   The result is that Dr.Java hangs with a spinning wrist watch.

   As far as I can tell, the problem seems to be that my code is 
assuming that keyboard input will be derived from the System.in stream. 
I guess that Dr. Java assumes that keyboard input derives from an 
alternative stream?

   Any help with this one or alternative code for simplifying keyboard 
input is greatly appreciated.

   Many thanks in advance,

     Carl.

--
Dr. Carl Pulley (Lecturer)
School of Computing and Mathematics,
University of Huddersfield,             email: c.j...@hu...
Huddersfield                            WWW: 
http://scom.hud.ac.uk/scomcjp