java null pointer exception Android studio

Question

I'm trying something. I'm want to create new object and add in list. But I get NullPointerException. My code is

private List<HisseModel> hisseListe=null;`
HisseModel model = new HisseModel();
        model.setSymbol("abv");
        model.setChange("123");
        model.setCurrency("234");

        HisseModel model2 = new HisseModel();
        model2.setSymbol("abv2");
        model2.setChange("1232");
        model2.setCurrency("2342");

        hisseListe.add(model);
        hisseListe.add(model2);`

Why it's not working ?

Because you never initialized `hisseListe` – Michael Krause Jun 13 '21 at 19:44 — Michael Krause, Jun 13 '21 at 19:44

score 1 · Accepted Answer · answered Jun 13 '21 at 19:44

1

The problem is here which is assigned to null

private List<HisseModel> hisseListe=null;

You need to initialize it like below

private List<HisseModel> hisseListe=new ArrayList<>();

answered Jun 13 '21 at 19:44

Beshambher Chaukhwan

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score 1 · Answer 2 · answered Jun 13 '21 at 19:55

Problem is at below line

 private List<HisseModel> hisseListe=null;

null is not an object, so you can't access it - that's a NullPointerException.

You'll need to initialize a list (like below) and then add object into it.

private List<HisseModel> hisseListe = new ArrayList <HisseModel>();

java null pointer exception Android studio

2 Answers2