02115   Java Programming
Autumn 2011

Preparations for the week

• Maps can hold keys of the basic types, just as shown for an ArrayList in section 8.9 of our BK textbook where wrapper classes are introduced. For a Map we could e.g. write

        HashMap bookings = new HashMap();
        bookings.put(1, new Book( ... ));
        

  And then in the command line interface a:

        System.out.println(bookings.get(1));
        

  will work if a toString() method of class Book is present and will give a printout of the Book-object having the key 1 in our bookings map

• It's not a requirement that one can change interface in a program run. The choice of interface - command line or GUI - should be made at the very beginning of the program run. It could e.g. be made by a parameter to the main() method of the system
• In the GUI the only requirement is to have the same functionality as in the command line interface. You don't need a button for each command, so feel free to achieve the functionality as user friendly as possible

The lectures

Exercises at the PC's