Transcript BlueJ: a very quick introduction

BlueJ:
a very quick introduction
Adapted from notes by
D. Matuszek, Upenn
BlueJ
• BlueJ is an IDE
• IDE = (Interactive|Integrated) Development
Environment
• It includes
–
–
–
–
an editor, which you use to write your programs
a debugger, to help you find your mistakes
a viewer, to see the parts of your program
an easy way to run Java programs and program
components
– an easy way to view documentation
• http://bluej.org/
(Iteractive|Integrated) Development Environments
• Most IDEs are language specific, tho some basic
ones can be used with multiple languages.
• There are IDEs for most popular languages (Java,
C++, C, Lisp, Smalltalk, Prolog, …)
• There are dozens of IDEs for Java
– Java’s capabilities for reflection makes it easy to write
– Reflection allows a program to examine or "introspect”,
seeing it’s own components and (even) code.
• IDEs tend to be large, complicated and difficult to
learn
BlueJ at UMBC
• Your best bet is to download and install BlueJ on
your own computer.
• There are specific versions for Windows and
MAC OS X
• There is a generic Java version that can be run on
most any machine with Java (e.g., Linux, Solaris,
…)
• BlueJ is installed on O:\BlueJ\ on the UMBC OIT
PC servers
– You may need to show it where the java programs are
Open BlueJ, choose New Project
Name the project, click Create
Create and name a new
Class or Applet
The name of the
class should begin
with a capital letter
Double-click the new class to edit it
The stripes show that the
class "Drawing" is not
compiled (ready to run)
Edit your class, then Compile it
BlueJ starts you with a
simple class or a simple
applet. You can modify
what BlueJ gives you, or
just replace it with your
own program.
If it's an applet: Right-click the
class and choose Run Applet
If applet: choose how to run it,
and what size it should be
Here's the running applet!
If application: right-click and
choose void main(args)
Application: Just click Ok
Application results
Viewing classes
BlueJ’s main display
shows all of the classes in
your package and the
relationships between them
Viewing classes and instances
You can interactively create
Instances and call methods
Attached to any class
Final notes
• You don't have to Save your work—BlueJ does that
automatically for you when you compile
• If you quit BlueJ and come back later, use Open
Project to continue where you left off
• This quick introduction does not replace working
through the tutorial!
The End