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Thread: Button not showing on panel?

  1. #1
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    Default Button not showing on panel?

    I have three classes.. 1. panel class 2. frame class and 3. tester class

    I am creating the objects like so but when I add button to panel then panel to frame I am not seeing the button. here is my code

    import javax.swing.JButton;
    import javax.swing.JPanel;
     
     
    public class Panel extends JPanel{
     
    	private JPanel p;
    	private JButton b;
     
    	public Panel(){
    		p = new JPanel();
    		b = new JButton("hey there");
    		p.add(b);
    	}
    }

    import javax.swing.JFrame;
     
     
    public class Frame extends JFrame{
     
    	private JFrame frame;
     
     
    	public Frame(){
    		frame = new JFrame();
    		frame.setSize(400,600);
    		frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    		frame.setVisible(true);
    	}
     
    }

    public class Tester {
     
     
    	public static void main(String args[]){
     
    		ContactsArrayList list = new ContactsArrayList();
    		Frame f = new Frame();
    		Panel p = new Panel();
     
    		f.add(p);
    	}
    }


  2. #2
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    Default Re: Button not showing on panel?

    The problem is your Frame class. Frame "is-a" JFrame, so you don't need to create a new JFrame inside of it (you are making the same mistake in your panel class).
    Instead, you want to do a super call. So, here is what your frame class should look like:
    public class Frame extends JFrame{
    	public Frame(){
    		super();
    		super.setSize(400,600);
    		super.setDefaultCloseOperation(EXIT_ON_CLOSE);
    		super.setVisible(true);
    	}
    }
    You need to make a similar change in your Panel class. Try to understand what I did, and apply it to your panel class. If you have trouble, feel free to ask me to clarify.
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  3. The Following User Says Thank You to aussiemcgr For This Useful Post:

    camel-man (January 27th, 2014)

  4. #3
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    Default Re: Button not showing on panel?

    Thank you very much sir.

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Button not showing on panel?

    BTW Giving your classes the same name as existing Java SE classes is confusing. It's Better to use different names.
    If you don't understand my answer, don't ignore it, ask a question.

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