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Why do I have a NullPointerException?

Java: NullPointerException?

  • Here's the code I have and it is giving a very stupid error! any idea why? public class Main { public Main() { allStudents = new Stu[1]; ...show more

  • Answer:

    We have to allocate the memory individual elements of the array. If you give that no more errors will not be occurred there. And please define the students class outside of the Main class. Because this is not better of the good programmers.

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You declare the array, but don't put any objects in it allStudents[0]= new Stu(); //right before the spot you got the null pointer For that matter, do you really want an array? A Vector might be a better choice.

Greg M

I think the variables in a class are default to private, so to change them requires a method in the class.

Tasm

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