import javax.swing.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.*;
import java.awt.Color;

public class Graphics2DTest5 extends JPanel{

  public static void main(String[] args){
    JFrame frame = new JFrame();

    Graphics2DTest5 app = new Graphics2DTest5();
    frame.getContentPane().add(app);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  public void paintComponent(Graphics g){
    Graphics2D g2 = (Graphics2D)g;

    g2.setBackground(Color.PINK);
    g2.clearRect(0, 0, getWidth(), getHeight());
  }
}