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Thread: Source from a JComboBox

  1. #1
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    Default Source from a JComboBox

    So I have a JComboBox and a button. I want the user to select an option from the combo box, then click the delete button which will call the action listener:

    ActionListener DeleteVert = new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				JComboBox cb = (JComboBox) e.getSource();
    		        String Selection = (String)cb.getSelectedItem();
    		        System.out.println(Selection);
    			}
            };
     
            Delete.addActionListener(DeleteVert);

    When I try to click the button it throws an exception on the line:
    JComboBox cb = (JComboBox) e.getSource();

    The exception says something about an unknown source. Anyone got any ideas whats wrong?


  2. #2
    Super Moderator jps's Avatar
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    Default Re: Source from a JComboBox

    Perhaps the source was not a JComboBox? What does the error message say?

  3. #3
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    Default Re: Source from a JComboBox

    I changed it so the action listener is set to the combo box instead of the button and it prints when I click on one of the options in the drop down box, but I wanted it so that you select the option and then press the button for it to run.

    Any idea how I would do that instead?

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