CMSI 281
Preparation for Quiz 1
==============================================================================

So far we've worked on a lot of concepts that great Java
software developers need to know.  Review the following
(note that the topics are listing in no particular order):

  - The four exception classes you will probably throw quite
    a bit in your own code: IllegalArgumentException,
    IllegalStateException, NoSuchElementExcpetion,
    UnsupportedOperationException

  - Immutability

  - Static factory methods

  - Making a constructor private so construction may ONLY
    take place via factory methods

  - Enums

  - Interfaces

  - Subclassing

  - Deciding which methods should be abstract and which
    should not

  - Testing with JUnit (both positive and negative tests;
    tests that expect exceptions; how to look for boundary conditions:
    null, empty, full, etc.)

  - Constructors with this() calls

  - Being super vigilant about nulls -- prevent null arguments
    in constructors, prevent null fields, prevent method calls
    or field accesses on nulls.

  - Writing equals and hashCode and toString

  - Managing code in multiple packages

  - Class invariants, e.g. keeping the fields of objects in
    a consistent, known state (remember the direction value
    in the Line class, and the numerator and denominator in
    the Rational class).

  - Static initializers, instance initializers, anonymous classes

We also did some UML.

The quiz problems will mostly be ones in which you are asked
to write a Java code fragment, but there will be at least one
in which you have to give an UML diagram.

There will definitely be questions in which you will
have to

  - write a subclass of an existing subclass

  - write a Java method for processing an array
    given an English description of what the method
    is supposed to do

  - give an interface for something.  To practice,
    try to write an interface for a robotic arm that
    controls an adjustible wrench.

as well as a few others.  Don't forget to check the
practice questions linked from the class web page.