nested class/method

hello,

Im working on some code right now that uses a few diffren classes and methods. what i would liek to do is create a class that calls methods from other classes.. so for example i call

Code:

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classA.method1();
classB.method2();
classB.method3();

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to do something in my code, what i want to do is put these method calls inside another class and method for example:

Code:

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public class classC{

public void method4(){
classA.method1();
classB.method2();
classB.method3();
}

  }

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so that in my main class i can just call to method4() and it does all of these things ? mostly the reason for this is to keep the clutter and redundancy down in the main method .. i guess my question is, can this be done or am i wasting my time and redundancy is the best answer. i can post actual code if that would help but its somewhat of a vague question and i figured i can continue to figure out why it doesnt work as long as its an error in my code and not something that doesnt work by design.

Thanks
Russ

Erm... why shouldn't you be able to do it like that? Just try it and ask if it does not work, right? ;)

BUT... you cannot call it for _classes_ but for objects... You need to create a new object of that class. Well you can but then you need to make the methods static and that is not really advisable.

i did try and im getting an error, so i just wanted to make sure that im not trying something thats "not allowed" or something before i waste a bunch of time figuring out why it does not work. but from what your saying it should work, which is what i thought, so i guess im going to inspect my code some more.

Thanks so much for the help
Russ

I could probably immediate tell you why the error occurred but I need to know what error it is... ^^
If you have a problem related to an error it is probably best to post the error message and at least the lines of code affected.

error message is :
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at Deck.getCard(Deck.java:67)
at DealCard.getCard(DealCard.java:14)
at BlackJack.main(BlackJack.java:12)

i know im getting the error message because a null value is being called for the index of the arraylist, i just need to figure out why its null, i will try for a few and post back in a bit if i cant figure it out but i think ill get it, and i like to fix my code on my own if i can because im such a noob to java the experience is usually a good lesson :) i will post back later if i cant figure it out on my own, but thank you for wanting to help.

Russ

i figured it out, i have an arraylist of objects and what i was neglecting to do is call the method that creates the arraylist so when i was calling methods to use it there was no list to be found.

Thanks
Russ

Well to be precise this means that you use an index in an array reference that is not valid - the item is not null it does not even exist, else you would get a NullPointerException. This is a slight difference when looking for the error. I hope you found it.

thanks, thats good to know, and yeah i figured it out.