AboutCasting: upCastAndPolymorphism()

[matyb]

AboutCasting: upCastAndPolymorphism()

[matyb]

Yeah - that's a quirky lesson, it needs some polishing I'm afraid. I rewrote some of it to make better sense (ie extension as a form of specialization) this should compile and get it's point across effectively.

Please close this issue if you feel the changes in my issue15 commit a moment ago help. There's certainly room for improvement there, and that I am open to hearing about it. I certainly appreciate the feedback either way, but in larger volumes - pull requests are the most convenient to get through.

[kjc]

The "oldest" (base) class is Child, which is extended by Parent and then extended again by GrandParent... which is kind of weird. Makes it harder to tell what was intended when you have a line like Object parent = new Child();... but I guess the intent is to confuse, at least a bit.

No compilation errors though, and I could get all these koans working. The only cleanup I'd really suggest is moving Child and its interface Sleepable up from the bottom of the file so that they appear before the classes that extend them. Closing this one.

PS: I've never used git before --- only Subversion, CVS, and RCS --- so I can't make pull requests until I read up on what they are. :) Not a project I can start tonight, I'm afraid.