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| Difficulties Learning
Java How to Improve The 10 Most Common Java Mistakes The 10 Developing Mistakes Where to Find Info What to Read How to Troubleshoot |
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To master Java you need to know: - how to solve problems algorithmically using Java's syntax and environment - the various classes contained in Java's packages and how to use them - the OO model and the design behind Java's classes |
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Read other people's code Experiment with the language itself Experiment with all the basic classes Read Java's source code Write the same program from scratch each time trying a different way Spend time reflecting on a design and try to identify parts that worked well, felt nice and looked beautiful When you find yourself spending a significant amount of time designing over implementing it's time to start learning OOD methods and Design Patterns |
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Missing ( ) [ ]
Forgotten Imports A Class for an Object Spelling mistake Wrong Signature Return nothing = void Wrong equality Endless loops Many public classes Trusting your code without testing! |
Unpredictable error messages
Class not Found Method not found (if not static) Various error messages Wrong type of Arguments Invalid method declaration Incompatible type for if Program seems to be hanged Public class x must be defined in a file called "x.java" |
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Blob, The God class
Lava Flow Functional Decomposition Poltergeist Golden hammer Spaghetti Code Cut and Paste Swiss Army Knife Reinvent the wheel Reach a dead end |
Find related concepts and break it
Only prevention or else painful cure similar to the Blob Remove and trim often Expand your horizons Refactoring - Clean up Try to reuse at the black box level Simplify Find the right info Know what you are using |
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Magazines
Java-Report Application Developer Dr. Dobbs Journal Communications of the ACM |
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Java Books : Thinking in Java, Prentice-Hall 1998, ISBN: 0-13-659723-8 Java in a Nutshell, O'Reilly, 1997, ISBN: 1-56592-262-X A Little Java, A few patterns, MIT Press 1998, ISBN: 0-262-56115-8 Design Books : Design Patterns, Addison Wesley, 1995 ISBN 0-201-63361-2 Patterns Languages of Program Design 1,2,3, Addison Wesley |
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Debug either using a debugger or print statements Try to isolate and identify the error's source Sometimes -not very often- it is not your fault and you bumped into a genuine Java bug In this case, it is quite likely that other people have already found a workaround. Search the Usenet and specially : - comp.lang.java.programmer - comp.lang.java.api - comp.lang.java.tech - comp.lang.java.security - comp.lang.java.setup - comp.lang.java.misc |