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import javax.swing.*;
import java.awt.*;
public class Buttoncoloer {
public static void main(String[] args) {
Buttoncoloer gui = new Buttoncoloer();
gui.go();
}
public void go() {
JFrame frame;
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyDrawPanel drawPanel = new MyDrawPanel();
frame.getContentPane().add(drawPanel);
frame.setSize(300, 300);
frame.setVisible(true);
}
}
class MyDrawPanel extends JPanel {
public void paintComponent(Graphics g) {
g.setColor(Color.green);
g.drawOval(40, 40, 40, 40);
}
}