Show prompt before closing JFrame

Question

I am using windowClosing to confirm before closing a particular JFrame.

Before closing I get a confirm dialog but the problem is it closes even if I click the NO button. Any help please?

addWindowListener(new WindowAdapter() {

  @Override
  public void windowClosing(WindowEvent we)
  { 
    String ObjButtons[] = {"Yes","No"};
    int PromptResult = JOptionPane.showOptionDialog(null, 
        "Are you sure you want to exit?", "Online Examination System", 
        JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null, 
        ObjButtons,ObjButtons[1]);
    if(PromptResult==0)
    {
      System.exit(0);          
    }
  }
});

What is your JFrame's default close operation set to? Has it been set to: `jFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);`? — Hovercraft Full Of Eels, Mar 16 '13 at 12:05
`JOptionPane.showOptionDialog(null,"Are you sure you want to exit?","Online Examination System",JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null,ObjButtons,ObjButtons[1]);`: Don't pass `null` for the first argument. Pass the parent frame of the dialog, otherwise your optionpane dialog may go behind your frame. — Guillaume Polet, Mar 16 '13 at 12:09

score 15 · Accepted Answer · answered Mar 16 '13 at 12:06

15

What is your JFrame's default close operation set to? You need to make sure that it been set to: jFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

answered Mar 16 '13 at 12:06

Hovercraft Full Of Eels

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@user2125727 [for example](http://stackoverflow.com/a/9228595/714968) – mKorbel Mar 16 '13 at 12:11

score 13 · Answer 2 · edited Aug 19 '15 at 12:10

13

Try this

this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent we)
    { 
        String ObjButtons[] = {"Yes","No"};
        int PromptResult = JOptionPane.showOptionDialog(null,"Are you sure you want to exit?","Online Examination System",JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null,ObjButtons,ObjButtons[1]);
        if(PromptResult==JOptionPane.YES_OPTION)
        {
            System.exit(0);
        }
    }
});

edited Aug 19 '15 at 12:10

Jonathandgorman

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answered Mar 16 '13 at 12:11

Nidhish Krishnan

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I suggest you edit that code sample so that it's formatted correctly. It's unreadable. – Duncan Jones Mar 16 '13 at 12:14
1

This should be the accepted answer. – Wesos de Queso Jul 02 '17 at 06:22

score 2 · Answer 3 · answered Mar 16 '13 at 12:06

2

You can set the default close option of your JFrame to DISPOSE_ON_CLOSE if it is set to EXIT_ON_CLOSE. In that case it will resolve your query something like:-

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

answered Mar 16 '13 at 12:06

Rahul Tripathi

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score 2 · Answer 4 · answered Mar 16 '13 at 12:07

2

put this on on frame intialization

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

answered Mar 16 '13 at 12:07

Sachin

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Show prompt before closing JFrame

4 Answers4

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