Refresh JList in a JFrame

问题

I've got a JList which displays information from a vector. The user can then add and remove information from this vector. Is it possible to refresh the JList inside my JFrame when items are added / removed from the Vector? Currently I'm doing..

 list = new JList(names);
 jframe.add(new JScrollPane(list), BorderLayout.CENTER);

but this doesn't refresh the JList to anything new. I've check and my vector contents etc. do change but the list isn't refreshing. Why? how can I fix it?

回答1:

You should not be updating the Vector. Changes should be made directly to the ListModel then the table will repaint itself automatically.

If you decide to recreate the ListModel because of the changes to the Vector, then you update the list by doing:

list.setModel( theNewModel );

Edit: Forget the Vector and load the data directly into the DefaultListModel:

DefaultListModel model = new DefaultListModel();
model.addElement( "one" );
model.addElement( "two" );
JList list = new JList( model );

Now whenever you need to change the data you update the model directly using the addElement(), removeElement() or set() methods. The list will automatically be repainted.

回答2:

Call updateUI on the Jlist after modifying your Vector.

回答3:

I think I found the solution for the Jlist's graphic 'refresh'. Try calling this method after each add or remove element of the model that is held by the Jlist.

Jlist_name.ensureIndexIsVisible(model_name.getSize());

回答4:

you can use list.setListData(vector) each time the vector changes

来源：https://stackoverflow.com/questions/4262669/refresh-jlist-in-a-jframe

标签

java

swing

jlist