一些java代码，求大神给点简单的注释

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

//图形计数器JCounter三位
class JCounter extends JPanel {
private ImageIcon [] numSet = { new ImageIcon("c0.gif"), new ImageIcon("c1.gif"),
new ImageIcon("c2.gif"), new ImageIcon("c3.gif"),
new ImageIcon("c4.gif"), new ImageIcon("c5.gif"),
new ImageIcon("c6.gif"), new ImageIcon("c7.gif"),
new ImageIcon("c8.gif"), new ImageIcon("c9.gif"),
};
private JButton [] counter = { new JButton(numSet[0]), new JButton(numSet[0]), new JButton(numSet[0])};
private int counterNum;
private Insets space;

public JCounter() {
this(0);
}

public JCounter(int num) {
super();
setSize(23, 39);

space = new Insets(0,0,0,0);
this.counterNum = num;
for (int i=0; i< 3; i++){
counter[i].setSize(13,23);
counter[i].setMargin(space);
add(counter[i]);
}
this.setVisible(true);
resetImage();
}

public int getCounterNum() {
return(counterNum);
}

private void setCounterNum(int num){
this.counterNum = num;
}

private void resetImage() {
int ones, tens, hundreds;
ones = counterNum % 10 ;
tens = counterNum % 100/10;
hundreds = (counterNum) % 1000/100;
this.counter[0].setIcon(numSet[hundreds]);
this.counter[1].setIcon(numSet[tens]);
this.counter[2].setIcon(numSet[ones]);
}

public void resetCounter(int num) {
setCounterNum(num);
resetImage();
this.repaint();
}

public static void main(String[] args) {
JFrame jf = new JFrame("Test");
jf.setSize(23,39);
JCounter jc = new JCounter();
jf.setContentPane(jc);
jf.show();

jc.resetCounter(394);
}

}

不算太复杂，就是把3位数，显示成图片的数字
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