JoC #29: Viewer questions: timers

      Time is an illusion. Lunchtime doubly so.
            — Douglas Adams

We are starting a new, probably more or less regular, thing today: answering viewer questions.

In the first of the Q&A episodes, I am talking about timers: How to arrange something to happen after a specific time delay. This principle is generally useful for many games and simulations. We also get  bit more practice with int variables.

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Concepts discussedtime delay, variables, counting

JoC #3: Classes and objects

    If a man writes a book, let him set down only what he knows.
    I have guesses enough of my own.

          — Goethe

Alright, now it finally starts getting interesting! After the previous talk about installation, now we’re getting started actually doing stuff.

Watch this episode to get the first feel for working with Greenfoot, and see what classes and objects are all about.

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Concepts discussed: class, object, method, instance, return value, return type, void, int, boolean

And, as I said in the video: Follow @JoyOfCode on Twitter to get updates when new episodes are posted.

Scenario download for this episode:      (save and unzip before opening)