如何设置JList中选定的项目

Question

I would like to create a JButton that when I press it it selects the last item of a JList .

itemsList is my JList , I already have some items on it

int selectedIndex = itemsList.getMaxSelectionIndex();
itemsList.setSelectedIndex(selectedIndex);

I tried this, but it doesn't select anything

Answer 1

Your problem is that this method: getMaxSelectionIndex() gets the max index of the current selections made in the JList (as per the JList API). This is not what it seems you want or need. Instead you need to get the size of the list, obtainable via the list's model, and remove 1 from it:

itemsList.setSelectedIndex(itemsList.getModel().getSize() - 1);