Java - List with different object type

Question

I have a Parent class. I made an array of 3 parent objects. I also have a child class. Is it possible that I can have 1 of those 3 array elements be a child object?

private ParentClass[] a = new ParentClass[3]

ParentClass a[] = {
     new ParentClass("0"),
     new ParentClass("1"),
     new ChildClass("2")
};

This works fine. But I'm wondering, is this the correct way of doing it or is there any easier/cleaner way?

New to java btw from C.

After running the above code, please don't post I ran that particular code and it worked question. — user7780894
– user7780894, Commented Sep 17, 2019 at 16:28
@Reimeus Didn't get any errors. Just wondering, is this the right/best way of doing it? Java has so many new data types that I'm getting used to (coming from a C background). — AlfroJang80
– AlfroJang80, Commented Sep 17, 2019 at 16:42
Yes, it's the correct way. You'd use a Collection (like List) instead of arrays 99% of the time though. — daniu
– daniu, Commented Sep 17, 2019 at 16:45

kun · Accepted Answer · 2019-09-17 16:49:30Z

2

Alternatively you can do the following, List.of comes with Java 9. The returned list is immutable, immutable objects are very nice in a lot cases. Also in Java, we do Interface instance = new ImplementationClass(), for example List<Class> = new ArrayList<>(), ArrayList implements List interface

List<ParentClass> list = List.of( new ParentClass("0"), new ParentClass("1"), new ChildClass("2") );

answered Sep 17, 2019 at 16:49

kun

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1 Comment

daniu Over a year ago

Prior Java has Arrays.asList(...) .

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