How would I write a method that takes an object arraylist parameter and performs a method that is in a superclass

Question

Ok so the code i have is

public static void showCenter(ArrayList<TestPoly2> array){
        for(int i = 0; i < array.size(); i++){
            System.out.println(array.center());
        }
    }

I'm not sure how to go about this problem but this is what I have come up with from sitting here thinking.

.center()

is a method from the superclass

I want to be able to create multiple objects from multiple different classes and store them in the same arraylist if this is possible.

Any pointers or tips are helpful : )

Your question is not clear. `.center()` is in the superclass of _what_ exactly? — Dawood ibn Kareem, Mar 07 '18 at 00:27
Don't declare your parameter as an `ArrayList` -- any method you write for that will work equally well with any of the kinds of Lists, so declare `public static void showCenter(List list)` — Stephen P, Mar 07 '18 at 00:58

score 0 · Answer 1 · answered Mar 07 '18 at 00:26

0

Try using a foreach type loop

for (TestPoly2 elem : array) {
   System.out.println(elem.center());
}

this is of course the same result as doing a traditional loop

for(int i = 0; i < array.size(); i++){
    System.out.println(array.get(i).center());
    // or
    // TestPoly2 elem = array.get(i);
    // System.out.println(elem.center());
}

answered Mar 07 '18 at 00:26

Scary Wombat

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Thank you! this was very helpful! sorry the question wasnt very clear but this did help me out alot. – Mason Myers Mar 07 '18 at 19:15

How would I write a method that takes an object arraylist parameter and performs a method that is in a superclass

1 Answers1