Putting an ArrayList into a JList using ArrayList#toArray method

Question

I'm having trouble using the toArray method of the ArrayList class. I need to put the content of an ArrayList, vecPersonnages, into a JList, listeObjets, and I'd like to do it using ArrayList#toArray method. I managed to make it work by putting the values of my list in a tab and then putting this tab in the JList.

I did check on Google for help but everything that i found turned out not to work. I do have a toString method in my classes, however, i do not have a toString method in the class in which I utilize my JList.

This is how i declared my classes:

private JList<Personnage> listeObjets = null;
private ArrayList<Personnage> vecPersonnages = null;

Below is the code where I try to add the content of my ArrayList to the JList along with some things I tried, noted in comments:

Personnage[] tabPerso = new Personnage[vecPersonnages.size()];
for (int i = 0; i < vecPersonnages.size(); i++) {
    tabPerso[i] = vecPersonnages.get(i);
}
listeObjets.setListData(tabPerso);
//listeObjets.setListData(vecPersonnages.toArray());
//listeObjets.setListData((Personnage[]) vecPersonnages.toArray());
/*the last line gives me a ClassCastException (java.lang.Object 
  cannot be cast to personnage.Personnage)*/

exSnake · Accepted Answer · 2020-12-27 00:58:48Z

3

Use the overloaded method of toArray(), toArray(T[] a);

Personnage[] array = new Personnage[vecPersonnages.size()]; //Create a new array with the size of the ArrayList
vecPersonnages.toArray(array); // fill the array
listeObjets.setListData(array);

edited Dec 27, 2020 at 0:58

exSnake

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answered Apr 5, 2013 at 16:42

Eng.Fouad

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1 Comment

Eng.Fouad Over a year ago

@user2249860 You are welcome. If this answers your question, check the right mark to make this answer as the right one.

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