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Last Post:
Aug 16, 2009 7:09 PM
by: tomross
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adding fillOval to jpanel
Posted:
Mar 31, 2009 4:53 AM
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Hi
First time post here so sorry if this is the wrong place to put this, but i really could do with some help.
im trying to add a filled oval to a JPanel, without creating a 2nd class which i extend.
i have created the GUI which appears fine, but i not able to add the oval to a JPanel.
this is my code.
public class test
{
private JFrame newFrame = new JFrame("Test Circle");
private JPanel newPanel = new JPanel();
private JPanel newPanel2 = new JPanel();
private JTextField text = new JTextField("test field");;
private Graphics img;
/**
* Constructor for objects of class test
*/
public test()
{
newFrame.setPreferredSize(new Dimension(400, 400));
newFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container content = newFrame.getContentPane();
content.setLayout(new GridLayout());
newPanel.setLayout(new GridLayout());
content.add(newPanel, BorderLayout.CENTER);
newPanel.add(text);
img.fillOval(60,60,60,60);
content.add(img);
newFrame.setVisible(true);
newFrame.pack();
}
i always seem to get a NullPointerException at the line img.fillOval(60,60,60,60);
if you could point me in the right direction that would be awesome.
i really would like to know how to do this with out having to put the shape in to a seprate class and creating an object of that class
thank
Wire
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Re: adding fillOval to jpanel
Posted:
Aug 16, 2009 7:09 PM
in response to: wireoless
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Hi,
I haven't looked carefully at your code, but your "Graphics img" seem should be initialized by using getGraphics().
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