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[java] Making a button show?

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Ok I'm making a simple Java app, but I can't seem to get the button to show. The API documention isn't helping any, either. Here is the code:
import java.awt.*;
import java.awt.event.*;

class Calculator extends Frame {
	
	public Calculator() {
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				dispose();
				System.exit(0);
			}
		});
	}

	public static void main(String args[]) {
		System.out.println("Starting Calculator...");
		Calculator mainFrame = new Calculator();
		mainFrame.setSize(400, 400);
		mainFrame.setTitle("Calculator");
		mainFrame.setVisible(true);
		Button addB = new Button("Add");
		addB.setSize(25,25);
		addB.setLocation(100,100);
		addB.setVisible(true);
	}
}

Am I doing something terribly wrong that the button won't show up? UPDATE: I'm an a bigger idiot than I thought, I didn't call mainFrame.add(add); .... [Edited by - Gunslinger RR on April 1, 2005 9:52:43 AM]

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