ITEC 120 2009spring ibarland nokie jmdymacek

home—info—lects—labs—exams—hws
textbook—tutor/PIs—java.lang docs—java.util docs

lab05a
implementing a full class

Do problem P3.10 (Moths) from the textbook.
Note that there is a typo in the signature provided for getPosition; that method should return the moth's current location.

Also, write a method distanceToLight, which is given the position of a light, and returns the (full) distance between the light and the Moth. It doesn't change the Moth's position. As usual, complete the following steps in order:

• Modify the test class to include test cases for our new method;
• write the signature and method-stub and make sure the program compiles,
• and then complete the method. (Hint: Use Math.abs.)

Further practice, if you finish:
Add test cases, signature, and code for a method moveAgain. The method takes no inputs, and has the Moth move towards the light's last known location. The “last known location” initially starts as 0.0 (and is updated every time moveToLight or distanceToLight is called).

You might also make a second version of distanceToLight which takes no inputs, and returns the distance to the light's last known location.

home—info—lects—labs—exams—hws
textbook—tutor/PIs—java.lang docs—java.util docs

©2009, Ian Barland, Radford University Last modified 2009.Feb.16 (Mon)

Please mail any suggestions (incl. typos, broken links) to iba�rlandrad�ford.edu