CompSci 94 - Classwork 16- October 29, 2013
10 pts

Today's classwork goes along with Chapter 9, Section 1. You will be writing lists and manipulating them.

The following work needs to be checked off when you have completed it.

• First download the file listfun.a2w from the Compsci 94 web page.

• Ignore the tennis balls until the last item. You do not need them for anything with the animals.

• Create a list with all six animals in it.

  Note BUG in Mac: If you have a Mac, when you create the list, you can select an item to add to the list, but when you are ready to select an animal such as "entire Chicken", it will not let you click and select it. If you press enter, it will add the Chicken to the list.

• Write the following methods. You should use "For all in order" or "For all together" where appropriate. Then call all the methods to demonstrate that they work.
  1. Write a method called SpinOneAtATime

     Spin each animal all the way around once.

  2. Write a method called jumpUpAndDownWhileWiggling

     All the animals should do the following at the same time, jump up .25 meters and come back down to the ground. They should all wiggle their legs while they are in the air.

     Note that all of these animals have the parts "rightLeg" and "leftLeg".

  3. Write the method compareHeightsWithOnePlayer

     This method passes in a parameter which is one of the animals. It then compares this animal with all the animals in the list, one at a time. Whenever it compares, if the heights are the same, the animals being compared should say "the same". If the heights are different, the one who is shorter should say "I'm shorter" and the one who is taller should say "I'm taller."

  4. Write the method compareAllHeights

     Compare all the heights of all pairs of animals. For each animal, you should have it say "Compare Me" and then compare it with all the other animals, one at a time by calling compareHeightsWithOnePlayer.

     HINT: Think about using something you have already done!

     

  5. Method TennisBallFun Now let's do something with the tennis balls. Create a list, put them in the list and then create a method TennisBallFun that does the following.
     1. Do something to every ball (your choice) one at a time.
     2. Have one of the balls (choosen randomly) visit each ball in the list (except itself) by moving close to each ball and saying a greeting.
     3. Turn all the balls invisible at the same time.

If you finish early, feel free to embelish your animations.