Programming with Java -- Solution 1

Hello, who

Look at Program.java.
Look at Application.java.
Look at Applet.java. Notice how Applet is used as a private class name derived from java.applet.Applet.
Run test from makefile. If CLASSPATH is just right... However, if you obtain an applet from the net it cannot access the properties.

Math

Look at Math.java. Notice how concatenation is used in fmt() to convert and pad a number to three columns.

Recursion

Look at Fibonacci.java. In fib() notice the explicit conversion and how overflow is detected. Also notice how fmt() is made less dependent on the situation at hand.

Words of Wisdom

object: encapsulates a particular state and knows methods to manipulate it.
class: contains all objects that encapsulate the same kind of state and use exactly the same methods.
method: procedure specific to a class of objects that manipulates their state.
message: method call, manipulation of the state of the receiving object with a particular method.