CPSC 330, January 28, 2009

News

• Amazon Preparing To Release New E-Reader, The Kindle 2
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Videos about Netbeans:

• Introduction to NetBeans IDE 6.5
• All Video Tutorials and Demos of NetBeans IDE 6.x
• Playlist: 99 Sec, NetBeans 6.0, UML videos

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Review

• Chapter 1 mentions several design principles

  Design Principle

  • Identify the aspects of your application that vary and separate them from what stays the same. All patterns provide a way to let some part of a system vary independently of all other parts.

  Design Principle

  • Program to an interface, not an implementation.

  Design Principle

  • Favor composition over inheritance

• Chapter 1 gives an example of the strategy pattern

  The Strategy Pattern defines a family of algorithms, encapsulates each one and makes them interchangeable. Strategy lets the algorithm vary independently from clients that use it.

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Assignment due Monday, January 26, 2009

For Monday - set up a class for Muscovy duck. Some sources say it is a quackless duck. It certainly looks like it could fly.

Write an application similar to MiniDuckSimulator.java that shows off the features of a Mallard and a Muscovy duck.

The Brain Power item on page 23 asks "How would you implement your own duck call that does not inherit from the Duck class? " Write an implementation of a duck call class that does not inherit from the Duck class, and write an application to demonstrate it.

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Chapter 2

The Observer pattern.

UML Diagrams for Observer pattern. Created using UMLet.

UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux.

Observer Pattern

 

Weather Station

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Writing Assignment

Read the following articles. Write a paper of at least 600 words that summarizes each and then compares them.

• Design Patterns Example
• Observer

"Reading maketh a full man; conference a ready man; and writing an exact man." Bacon, Essays, Of Studies

Write clearly, precisely, and concisely. The audience is other students in the class. Remember that you are writing, not conversing.

Draft is Due next Monday. Paper is due next Wednesday.

Consult/Read "The Elements of Style," http://www.bartleby.com/141/index.html, by William Strunk, Jr.

• ELEMENTARY RULES OF USAGE
  1. Form the possessive singular of nouns with 's
  2. In a series of three or more terms with a single conjunction, use a comma after each term except the last
  3. Enclose parenthetic expressions between commas
  4. Place a comma before and or but introducing an independent clause
  5. Do not join independent clauses by a comma
  6. Do not break sentences in two
     In other words, do not use periods for commas.
  7. A participial phrase at the beginning of a sentence must refer to the grammatical subject
  8. Divide words at line-ends, in accordance with their formation and pronunciation
• ELEMENTARY PRINCIPLES OF COMPOSITION
  9. Make the paragraph the unit of composition: one paragraph to each topic
  10. As a rule, begin each paragraph with a topic sentence; end it in conformity with the beginning
  11. Use the active voice
      The habitual use of the active voice, however, makes for forcible writing. This is true not only in narrative principally concerned with action, but in writing of any kind. Many a tame sentence of description or exposition can be made lively and emphatic by substituting a transitive in the active voice for some such perfunctory expression as there is, or could be heard.
      

      There were a great number of dead leaves lying on the ground.	Dead leaves covered the ground.
      The sound of the falls could still be heard.	The sound of the falls still reached our ears.
      The reason that he left college was that his health became impaired.	Failing health compelled him to leave college.
      It was not long before he was very sorry that he had said what he had.	He soon repented his words.

  12. Put statements in positive form
      Make definite assertions. Avoid tame, colorless, hesitating, non-committal language.
  13. Omit needless words
      Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that every word tell.
  14. Avoid a succession of loose sentences
  15. Express co-ordinate ideas in similar form
      This principle, that of parallel construction, requires that expressions of similar content and function should be outwardly similar. The likeness of form enables the reader to recognize more readily the likeness of content and function.
  16. Keep related words together
  17. In summaries, keep to one tense
  18. Place the emphatic words of a sentence at the end

 

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This work is licensed under a Creative Commons License.
Ernest Ackermann Department of Computer Science, Mary Washington College
CPSC 110 | CPSC 330 | CPSC 401

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