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2.7 Creating a ShuffledWordLibrary

Juppies 2 by Dr Heinz M. Kabutz

We now create a ShuffledWordLibrary by clicking on the WordLibrary abstract class and clicking ALT+Enter, an amazing shortcut that does a lot of heavy lifting in NetBeans (and IntelliJ - Eclipse has a similar magic button CTRL+0). Our ShuffledWordLibrary is not going to contain any words, but will have the functionality of shuffling the words, so that they are not always presented in exactly the same order. After a few games that would get boring.

We add a "field" to the class, which will be another WordLibrary that will contain the words. We declare the field to be final, which requires us to initialize it immediately. We do this by creating a constructor with ALT+Insert. The constructor has the exact same name as the class, but without a return type. If you add a return type (void, int, String, etc.) then it is no longer a constructor, but a method. Whilst we are allowed to have methods with the same name as the class, this is strongly discouraged as it would confuse the reader.

We could have hard-coded the ShuffledWordLibrary to always use the StaticWordLibrary by declaring the field like this:

  private final WordLibrary other = new StaticWordLibrary();

However, then we could only ever have that list of words in our game. What if we want to have a new list? Perhaps read from a file?

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Heinz Kabutz Java Conference Speaker

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