代码如下import java.awt.*;import javax.swing.*;//图形计数器JCounter三位class JCounter extends JPanel {        private static final long serialVersionUID = 1L;        private ImageIcon [] numSet = { new ImageIcon("p_w_picpath/c0.gif"), new ImageIcon("p_w_picpath/c1.gif"),                                             new ImageIcon("p_w_picpath/c2.gif"), new ImageIcon("p_w_picpath/c3.gif"),                                             new ImageIcon("p_w_picpath/c4.gif"), new ImageIcon("p_w_picpath/c5.gif"),                                             new ImageIcon("p_w_picpath/c6.gif"), new ImageIcon("p_w_picpath/c7.gif"),                                             new ImageIcon("p_w_picpath/c8.gif"), new ImageIcon("p_w_picpath/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

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);

}

}

效果图