Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
418 views
in Technique[技术] by (71.8m points)

java - JList.getModel() ClassCastException

When I call JList<String>.getModel() and cast it to DefaultListModel<String> it gives me this exception.

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JList$4 cannot be cast to javax.swing.DefaultListModel

The code that throws it:

private JList<String> list = new JList<String>();
((DefaultListModel<String>) list.getModel()).addElement(...);

It doesn't do it every time though. Most of the time it works perfectly, but other times it throws this exception. I don't understand why this is happening. Is there anything I can do to stop this from happening?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

I experienced this issue. I found this simple workaround:

//----instantiation----

    JList mList = new JList();
    mList.setModel(new DefaultListModel());

    /*---- do whatever you want---- */

    //Retain it wherever you want with
    DefaultListModel model = (DefaultListModel)mList.getModel();

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...