I am creating a java application using NetBeans 7.3.
I have a "Create New Foo" wizard that shares a JPanel across multiple frames.
The JPanel object implements a JList that I have setup as shown here:
http://img811.imageshack.us/img811/5717/customcodepvmarketlist.jpg
Using another function, I want to be able to test the contents of the JList, like so:
//Adds a market to the list, if it doesn't exist.
//Removes a market from the list, if it does exist.
//If removing a market causes the list to become empty,
//insert 'None'
public String modifyMarket(String market) {
if(pvMarketList.getModel().contains(market)) {
//More Code
}
}
I can't do the above test on '.contains(market)' because .getModel() is returning a ListModel instead of a DefaultListModel.
What is the problem? How can I fix this?
UPDATE
I might be able to work around the issue by casting the ListModel as a DefaultListModel, but I remain confused as to why ListModel is what is being returned.
A JList
needs an instance of ListModel
to work. This instance could be an instance of DefaultListModel
, but you could create your own ListModel
implementation and use it instead of DefaultListModel
.
BTW, note by the constructors of JList construct a JList with a ListModel that is not an instance of DefaultListModel.
If you know that it is a DefaultListModel
, because that's what you passed when constructing the list, then you can safely cast the returned ListModel
to DefaultListModel
.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.