Java making FileReader a member variable

Question

So I use the line a lot.

FileReader reader = new FileReader(file)

and I want to make this line a member variable. Like this:

private FileReader reader = new FileReader(file);

The problem is that java doesn't like this and gives the error:

The default constructor cannot handle exception type FileNotFoundException thrown by implicit super constructor. Must define an explicit constructor Java(16777362)

So I made a constructor like this:

protected Json() throws FileNotFoundException
{
    //
}

the problem is, is that I use the JSON class in different classes and those classes will give the same error, so I had to edit the other classes, but that ended up looking really ugly and gave a lot of problems. Is there a solution to this problem?

Did you consider to handle (try/catch) the exception sooner? Or is that not feasible? — MDK
– MDK, Commented Oct 20, 2020 at 8:47
Also take a look at this, this or this, all of which discuss the same problem — MDK
– MDK, Commented Oct 20, 2020 at 8:49
use an aggregation instead on a composition 👉🏻 stackoverflow.com/a/1468285/8030651 ➡️ you can localize problem with FileReader initialization — kozmo
– kozmo, Commented Oct 20, 2020 at 8:52

Nope 69 · Accepted Answer · 2020-10-20 09:19:50Z

0

So I decided to do it like this

JSONArray jsonArray = (JSONArray) jsonParser.parse(new FileReader(file));

answered Oct 20, 2020 at 9:19

Nope 69

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