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Frequently Asked Questions
Technical FAQ
These pages have been moved from the old wiki.
The basics
Sequencing and timing
- I display images in sequence but I see only the last one. Why?
- How do I display a message for a few seconds?
- How to manage the steps of a game: increasing levels, displaying messages, etc.?
More advanced questions
- From several variables to arrays
- From several arrays to classes
- Why use ArrayList instead of array with append()?
Commonly asked technical tasks
Common problems
- Why I can't create an instance of a library from my own classes?
- Common issues with sketch names
- Cannot find a class or type named "Xyz"
- Why are text and graphics so ugly and blocky?
- Why is my mouse pressed code executed several times?
Exceptions
- What is an exception? (and what are "unhandled exceptions")
- Why do I get a NullPointerException?
- Why do I get an ArrayIndexOutOfBoundsException? See also CommonErrors and Troubleshooting
Eclipse
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