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| import java.awt.*;
import javax.swing.JFrame;
public class Bullseye extends JFrame {
private final int MAX_WIDTH = 300;
private final int NUM_RINGS = 5;
private final int RING_WIDTH = 25;
public static void main(String[] args) {
Bullseye b = new Bullseye();
b.setDefaultCloseOperation(EXIT_ON_CLOSE);
b.setPreferredSize(new Dimension(256, 256));
b.pack();
b.setVisible(true);
}
public void paint(Graphics page) {
int x = 0, y = 0, diameter;
setBackground(Color.cyan);
diameter = MAX_WIDTH;
page.setColor(Color.white);
for (int count = 0; count < NUM_RINGS; count++) {
if (page.getColor() == Color.black)
page.setColor(Color.white);
else
page.setColor(Color.black);
page.fillOval(x, y, diameter, diameter);
diameter -= (2 * RING_WIDTH);
x += RING_WIDTH;
y += RING_WIDTH;
}
page.setColor(Color.red);
page.fillOval(x, y, diameter, diameter);
}
} |