Why can't I close my JFrame ?

**bartolio** · February 20th, 2013, 10:40 AM

This is just a small piece of the code, but when I run this I get an error.

private void buildGUI() {
		addressView = new JXAddressView();
		addressView.setData(this);
		JFrame frame = new JFrame();
		JPanel p = addressView.getViewPanel();
		frame.setContentPane(p);
		frame.pack();
		frame.setVisible(true);
		frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

I get this error:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
EXIT_ON_CLOSE cannot be resolved to a variable

at JXplorer.buildGUI(JXplorer.java:32)
at JXplorer.main(JXplorer.java:21)

**KevinWorkman** · February 20th, 2013, 10:58 AM

EXIT_ON_CLOSE is a static variable in the JFrame class. It can't find a variable named EXIT_ON_CLOSE in your current class, because you haven't specified one.

Hint: to refer to a static variable from another class, you use ClassName.VARIABLE_NAME

**bartolio** · February 20th, 2013, 11:04 AM

I still don't know what to do?

**KevinWorkman** · February 20th, 2013, 11:16 AM

For example, the Component class contains several static variables for alignment. If I want to refer to the static variable CENTER_ALIGNMENT of the Component class, I type:

Component.CENTER_ALIGNMENT

Simply referencing CENTER_ALIGNMENT without the class name is not enough, as Java has no idea where to look, which is why it says it can't find the variable.

**bartolio** · February 20th, 2013, 11:23 AM

It works! Thanks for the quick replies!

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