How about reading a tutorial from the web,
In Java here's a good tutorial (though a bit deprecated) which teaches how to make platform based games like mario you can also download and edit the source code too
http://www.javacooperation.gmxhome.de/TutorialStartEng.html
this covers the basic steps from first to last and you can reread the chapters
the mario game tutorial starts at lesson 7 though it's good to read the previous lessons
zeroliken
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