CODEWITHSUNDEEP
javaarraylist
Mukarram Pasha
Mukarram Pasha

Reputation: 368

How to initialize 2D list of custom class objects - Java

I am trying to create a 2D array of objects but getting this error:

array required, but List<List<TransitionObject>> found
----

This is my TransitionObject Class:

public class TransitionObject {
    public char character;
    public int state;

    TransitionObject(char character, int state)
    {
        this.character=character;
        this.state=state;
    }
}

and this is my main class code:

List<List<TransitionObject>> liist = new ArrayList<List<TransitionObject>>(); 
liist.add(new ArrayList<TransitionObject>());
liist[0].add(new TransitionObject('a',1));
liist[0].add(new TransitionObject('b',3));

I am getting this error when I try to add an object to my list. Solution with a short example would be nice. Thanks !

Upvotes: 5

Views: 1105

Answers (1)

nano_nano
nano_nano

Reputation: 12523

    liist[0].add(new TransitionObject('a',1));

is wrong. liist is no array.

if you need the first element from a List use get()

    liist.get(0).add(new TransitionObject('a',1));

Upvotes: 2

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