Java: Constructing a class within an arraylist initialiser causes an error

Question

I've got a constructor that takes a parameter ArrayList<Setting> settings.

Now the problem is that I wrote the following call in a subclass:

super(new ArrayList<Setting>(){new Setting("", this, 0)});

This causes a lot of errors, the main one being Invalid method declaration; return type required, as well as '{' or ';' expected, Parameter expected, Unexpected token and Constructor Setting() is never used.

I tried switching to using regular arrays and it worked fine:

super(new Setting[]{new Setting("Exp Only", this, false)});

For now, I'm happy just using regular arrays, however I come across this error rather frequently, is there something I'm doing wrong or is this just the way it is, and if so, why?

"*arraylist initialiser*"? in Java? can you point where you got that? — user85421, Jul 29 '19 at 16:41
That isn't valid syntax, why do you think this is valid syntax? — Mark Rotteveel, Jul 29 '19 at 18:11

parthivrshah · Accepted Answer · 2019-07-29T16:47:03.860

1

Java has introduced of method since java 9. You can use it as below.

super(List.of(new Setting("Exp Only", this, false)));

edited Jul 29 '19 at 16:47

answered Jul 29 '19 at 16:35

parthivrshah

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since java 9 of method is available. – parthivrshah Jul 29 '19 at 16:44
Thank you, thats exactly what I needed! – mastercooker Jul 29 '19 at 16:46

Java: Constructing a class within an arraylist initialiser causes an error

1 Answers1