The option ‘Declare field in class’ does the same thing, but numCourses is declared as a field instead of a local variable. You then need to replace the text _type_ with the appropriate type for the variable.
Figure 16 – The undeclared variable pop-up list The option ‘Declare variable here’ adds the text _type_ for you to declare the type of numCourses as a local variable. BlueJ offers you the option of adding either of the first two of these if it finds an undeclared variable (Figure 16).
An undeclared variable may be a misspelled identifier that you have already declared, or it may be that you need one of the following: a local variable a field a formal parameter.
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Given that there are multiple kinds of variable, you need to think carefully about how to resolve this kind of error. Undeclared variable If you have an unknown symbol in your code, it is often an undeclared variable. You need to know what type you intended to use in order to choose the correct option here, which is int.
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