JAVA32 - プログラム倉庫

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

public class ex02 extends JFrame {
public static void main(String args[]) {
new ex02("練習");
}
public ex02(String title) {
setTitle(title);
setDefaultCloseOperation(EXIT_ON_CLOSE);
getContentPane().add(new MyJPanel());
setSize(500,500);
setVisible(true);
}

class MyJPanel extends JPanel {
public MyJPanel() {setBackground(Color.white);}
public void paintComponent(Graphics g) {
super.paintComponent(g);
}
}
}