Old MacDonald Had A Farm.
From Huben's Wiki
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Download these two files: | Download these two files: | ||
| − | * | + | * [http://dl.dropbox.com/u/20086520/AP%20Comp%20Sci/CH11/McDonald/Animal.java Animal.java] |
| − | * | + | * [http://dl.dropbox.com/u/20086520/AP%20Comp%20Sci/CH11/McDonald/TestAnimal.java TestAnimal.java] |
into a new folder, and then load them into DrJava. | into a new folder, and then load them into DrJava. | ||
| − | Don't look at Animal. | + | Don't look at Animal.java or change anything in it. Just look at TestAnimal.java. |
| − | + | The instructions are in TestAnimal.java: | |
| + | * You will need a class for each type of animal. You should then be able to compile and run. | ||
| + | * Make a constructor for each animal class, and call setNoise() in the constructor. Cow() should have setNoise("moo"); | ||
| + | * You will need some classes for grouping animals together. For example, Duck and Chicken will extend a grouping class because they use the same methods. | ||
| + | ** Make a diagram of the hierarchy of Animal, the grouping classes, and your farm animals. | ||
| + | ** Create the grouping classes. | ||
| + | ** Fix the classes of each type of animal to extend from the grouping classes. | ||
| + | * Override methods eats(), babyfood(), and coat() from the parent classes as high up in the hierarchy as you can. | ||
| + | |||
| + | When you are successful, the program will inform you. At that point, you can uncomment the "Animal.song();" line, and you should get a correct rendition of the song. | ||
* Reading the song on Macs: | * Reading the song on Macs: | ||
| Line 17: | Line 26: | ||
* Reading the song on PCs: | * Reading the song on PCs: | ||
| + | ** Use Microsoft Narrator by clicking control-escape then R to bring up the run window and then type narrator and hit enter. | ||
| + | ** In the narrator window, uncheck everything except "read Typed Text" | ||
| + | ** Then paste your song into a new notepad document, and it will be read aloud. | ||
