RoboDuke's blog

In this lesson we are going to look at inheritance. But first I will tell you a joke from the Robot Kingdom about inheritance. Takes a while but well worth it in the end.

Things are going well in the Duke house these days. We had a wonderful holiday season and are now settling down to teaching you more Java. We have come a long ways but you ain’t seen nothing yet! This chapter is so very cool. I promise that ArrayLists are the best thing since sliced bread!

Now --- on to our lesson! Download our jar file for lesson 4 from the link below:

RoboDuke’s Extra Strength Challenge

And on with even more of my Java lessons. If you have forgotten (how could you??) I am RoboDuke, the Javarian. In this lesson, we will come down to ground level as we concentrate on methods, methods, and more methods! But before we do that, how about a good Java joke?

What would Juliet have said if she had been a Java programmer?

Sun added the Scanner class in the JDK5.0 version. They did not write all of the methods the way I would have (but who asked me??). There are some quirks to making it work correctly. The problem occurs when reading text input from the keyboard and whether the text has a space in it or not. In the answer for the StockDriver from module 2, note the code

Class Notice- Please join RoboDuke's new Java Class Group, and use the group for class questions!

Class Notice- Please join RoboDuke's new Java Class Group, and use the group for class questions!

So, naming in Java...

Unlike many computer languages, Java programmers do use rules for naming items. You will see that I carefully follow these rules. In a nutshell, make names meaningful and usually use only letters, no spaces, no hyphens. Name: