The Big List of Problems
From Huben's Wiki
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Using a compiler and programming environment for the first time is frustrating and tricky. Let's collect a bunch of the important problems and their causes, so that you can scan the list rather than getting stuck. Tell me when you have a new one to add! | Using a compiler and programming environment for the first time is frustrating and tricky. Let's collect a bunch of the important problems and their causes, so that you can scan the list rather than getting stuck. Tell me when you have a new one to add! | ||
| − | == | + | == DrJava == |
| − | ; | + | ; DrJava won't let me edit the files. |
: The files are not editable: you need to make an editable copy of them elsewhere. | : The files are not editable: you need to make an editable copy of them elsewhere. | ||
| − | ; | + | ; DrJava doesn't show the changes I made when I run my program. |
: Chances are that there are compilation errors: fix all the errors before you look at what the program does. | : Chances are that there are compilation errors: fix all the errors before you look at what the program does. | ||
| − | ; | + | ; DrJava is still running my old program, not the new one, and it compiles fine. |
: You may have to set the project to look in another class for the main(). | : You may have to set the project to look in another class for the main(). | ||
| + | |||
| + | ; DrJava can't find my class or image or other file. | ||
| + | : You may not have a project or you may have to set the project to look in the correct folder. | ||
== Compiler == | == Compiler == | ||
| − | Compiler messages are notoriously cryptic. The causes of the commonest compiler complaints | + | Compiler messages are notoriously cryptic. The causes of the commonest compiler complaints are from: |
* Forgetting a semicolon. | * Forgetting a semicolon. | ||
* You haven't declared a field. | * You haven't declared a field. | ||
| + | * Capitalization differences. | ||
* Calling a method with the wrong types or numbers of arguments. | * Calling a method with the wrong types or numbers of arguments. | ||
* Non-matching "double" or 'single' quotes, (parentheses), or {braces} | * Non-matching "double" or 'single' quotes, (parentheses), or {braces} | ||
| + | * Trying to use a method from another class. | ||
