[Java] Interface graphik

/*
 * Created on 05-mars-2005
 *
 * @author : WaKaaN
 */

import java.awt.*;
import java.awt.event.*;

public class MyFirstInterface extends Frame implements ActionListener {
	
	Button Trace = new Button("Write ! ");
	Button Delete = new Button("Clear ! ");
	
	MyFirstInterface(){
		setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
		
		add(Trace);
		add(Delete);
		
		Trace.addActionListener(this);
		Delete.addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent e){
		Graphics graphics = getGraphics();
			
		switch (CaseOfButton(e)){
			case 1 :
				graphics.setColor(Color.red);
				graphics.drawOval(50,50,100,100);
				!! break;  !!
				
			case 0 :
				graphics.setColor(getBackground());
				graphics.drawOval(50,50,100,100);
				!! break;  !!
		}
		
	}
	
	private int CaseOfButton(ActionEvent e){
		int CaseOfButton = 0;
		if(e.getSource() == Trace){
			CaseOfButton = 1;
		}
		else if (e.getSource() == Delete) {
			CaseOfButton = 0;
		}
		System.out.println(CaseOfButton);
		return CaseOfButton;
	}
	
	public static void main(String[] args) {
		MyFirstInterface Frame = new MyFirstInterface();
		Frame.setSize(300,300);
		Frame.setVisible(true);
	}
}