小日本国旗

package w02;

import java.awt.*;

import java.awt.geom.*;

import javax.swing.*;

public class Jpan extends JFrame{

<wbr><wbr> Jpan(){</wbr></wbr>

<wbr><wbr> super("Jpan");</wbr></wbr>

<wbr><wbr> setSize(400,300);</wbr></wbr>

<wbr><wbr> setDefaultCloseOperation<wbr>(JFrame.EXIT_ON_CLOSE);</wbr></wbr></wbr>

<wbr><wbr> JpanPane jp=new JpanPane();</wbr></wbr>

<wbr><wbr> Container pane=getContentPane();</wbr></wbr>

<wbr><wbr> pane.add(jp);</wbr></wbr>

<wbr><wbr> setVisible(true); <wbr></wbr></wbr></wbr>

<wbr><wbr> }</wbr></wbr>

public static void main(String[] args) {

Jpan jps=new Jpan();

}

}

class JpanPane extends JPanel{

public void paintComponent(Graphics comp){

Graphics2D comp2D=(Graphics2D)comp;

comp2D.setColor(Color.white);

comp2D.fillRect(0, 0, getSize().width, getSize().height);

comp2D.setColor(Color.red);

int cx=(int)getSize().width/3;

int cy=(int)getSize().height/3;

int cr=(int)getSize().height/3;

System.out.println(cx);

Ellipse2D.Float ee=new Ellipse2D.Float(cx,cy,cr,cr);

comp2D.fill(ee);

}

}