Computer Science 252
Problem Solving with Java

Spring 2014, The College of Saint Rose

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Agenda

• Announcements
  • Lab 4: The Birds of Spring due tomorrow afternoon
• More on the interface idea: implementing and using an Objectdraw interface
• Handling arrow keys - using a Java interface
• Introduction to Swing components
• In-class Exercise 13 - (10 lecture assignment points) due before the end of class.

  Extend the ShirtAndPants example to include a third type of article of clothing. Maybe it's warm and you need shorts. Or it's cold and you need a hat. Your new class should be an implementation of the Laundry interface. The only requirements are that your new object consists of at least 3 graphics primitives, at least 1 of which can be colored randomly, and that it can reasonably implement all of the methods required by the Laundry interface. Also modify the ShirtsAndPants class to create objects of your new type with equal probability as the existing TShirt and Pants objects. You should not need to make any other changes to the ShirtAndPants class.

  Please submit only the Java file for the new class you create that implements the Laundry interface in Submission Box under "InClass13" before you leave class.

Lecture 13 Assignment

Due at the start of class, Tuesday, March 11.

Please submit answers to these questions in Submission Box under "LA13" or in hard copy by the start of our next class. We will discuss these questions at the start of class, so no late submissions are accepted. Please be sure that your name is clearly indicated in all submissions.

• Recall the FallingSnow example. Modify this example so that each snowflake (that is, each FallingSnow object) stops falling when it reaches the bottom of the canvas, but then remains on the canvas for 5 seconds before "melting". During this 5 seconds, the snowflake should move down by 1 pixel every half second, then get removed from the canvas as before. You need only submit the updated run method for the FallingSnow.java class. (7 points)
• BDM Excercise 10.1.7, parts a and b, p. 258. You need not implement this in BlueJ unless you wish to do so. (8 points)

Examples

• FallingThings
• HandlingArrowKeys
• FallingBallUglyButtons
• FallingBallButtons
• FallingBallButtonsPanel

Links

• Java API Documentation: java.awt.event.KeyListener
• Java API Documentation: java.awt.event.KeyEvent