[JAVA] Graphics2D

import java.awt.*;
import javax.swing.*;

class Draw extends JComponent {
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        GradientPaint gp = new GradientPaint(0,0,Color.BLUE,250,250,Color.RED);
//        g2.setColor(Color.MAGENTA);   
//        g2.fillRect(0,0,150,150);     
        g2.setPaint(gp);
        g2.fillRoundRect(20,20,250,250,50,50);
//        g2.fillRect(20,20,250,250);
    }
}
class GFrame extends JFrame {
    public GFrame() {
        CreateFrame();
        add(new Draw());
    }
    void CreateFrame() {
        setTitle("Graphics");
        setSize(310,330);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setLayout(new BorderLayout());
        setVisible(true);
    }
}
public class GradientEx{
    public static void main(String[] args) {
        new GFrame();
    }
}