Lecture03: Numeric Expressions

In preparation for class, please do the following:

Choose a computer and log into your account.
Create or choose a folder for today's lecture.
Use an internet browser to obtain this page.
Download the files from this folder to your lecture folder.
Have pen and paper or a word processor ready to record important discoveries and questions.
Read the tips and review below.

Reminder: Lab01 is due in the drop box by 3pm Tuesday.

Tips

Learning Tip: Take advantage of opportunities to practice your problem solving skills.
Programming Tip: Code in small doses.
Learning and Problem Solving Tip: Try It! Experiment!

Review of Java Program Structure Covered So Far

Each program is constructed by completing a class definition.
A class definition consists of a class header followed by a collection of
- variable declarations
- method definitions
grouped within curly braces.
A method definition consists of a method header followed by a list of statements grouped by curly braces.
A method's name determines when the statements in the method are preformed. In particular, the following names associate instructions with user actions:
- onMousePress
- onMouseRelease
- onMouseClick
- onMouseEnter
- onMouseExit
- onMouseMove
- onMouseDrag
- begin
There are (at least) three kinds of statements:
- constructions (e.g., new FilledRect(150, 200, 100, 100, canvas) ),
- method invocations (e.g., ball.move(-10, 0)),
- assignments (e.g., ball = ... )