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Thread: Something I've never seen from the compiler is what I'm trying clear up

  1. #1
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    Default Something I've never seen from the compiler is what I'm trying clear up

    I'm getting this message from my compiler...

     

    Note: ShadeDesigner.java uses unchecked or unsafe operations.
    Note: Recompile with -Xlint:unchecked for details.




    ...and it seems to go away when I take away this statement with the comment...

     

    private void makeStylePanel()
    {
    stylePanel = new JPanel();

    styleBox = new JComboBox(styles); // This one right here.

    styleBox.setEditable(false);

    styleBox.addActionListener(new styleBoxListener());

    stylePanel.add(styleBox);
    }




    or write it like this.

     


    styleBox = new JComboBox();





    So, what exactly do these notes mean, and how do I clear them up?


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    Default Re: Something I've never seen from the compiler is what I'm trying clear up

    Hello.
    Usually these warnings appears with Java Collections sometimes.
    And they are always ignored as per my experience.

    Syed.

  3. #3
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    Default Re: Something I've never seen from the compiler is what I'm trying clear up

    That error appears because you didn't specify a generic parameter for the JComboBox.

    It's not strictly required (Java will default to Object which allows all objects, done for historical reasons), but it's usually a good idea to specify it.

    styleBox = new JComboBox<Object>(styles); // You probably should pick a more specific generic type than Object

    java - What causes javac to issue the "uses unchecked or unsafe operations" warning - Stack Overflow

  4. The Following User Says Thank You to helloworld922 For This Useful Post:

    SOG (August 14th, 2013)

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    Default Re: Something I've never seen from the compiler is what I'm trying clear up

    Thanks helloworld922. I got rid of the warning.

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