package aa;
import javax.swing.;
import java.awt.event.;
import java.awt.*;
public class aa{
JFrame jf;
aa(){
jf=new JFrame();
jf.setSize(300,300);
jf.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e)) {
Graphics g=jf.getGraphics();
g.setColor(Color.red);
g.fillRect(30, 30, 30, 30);
}
});
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
}
public static void main(String[] args) {
new aa();
}
}