import java.awt.*;

import javax.swing.*;


public class RoundButton extends JButton {

    public RoundButton(String label) {
        super(label);  //調用父類構造函數
        setContentAreaFilled(false);   //不自行繪制按鈕背景
    }


    //繪制圓和標簽
    protected void paintComponent(Graphics g) {
       if (getModel().isArmed()) {  //鼠標點擊時
            g.setColor(Color.lightGray);  //顏色為灰色
        } else {
            g.setColor(getBackground());  //置按鈕顏色
        }
        g.fillOval(0, 0, getSize().width, getSize().height);  //繪制圓
        super.paintComponent(g);  //調用父類函數,繪制其余部分
    }


    //繪制邊框
   protected void paintBorder(Graphics g) {
       g.setColor(getForeground());  //設置邊框顏色
       g.drawOval(0, 0, getSize().width-1, getSize().height-1);  //在邊界上繪制一個橢圓
   }

}