import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;


public class DrawOral 
{

    public static void main(String[] args)
    {
        new frame();    
    }
}
class frame extends JFrame
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public frame()
    {
        setSize(400,400);
        setLocation(400,200);
        button bt=new button("测试");
        bt.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                JOptionPane.showMessageDialog(frame.this,"hah");
            }});
        //add(bt);
        JPanel panel=new JPanel();
        
        panel.add(bt);
        add(panel,BorderLayout.NORTH);
        add(new JLabel("点击圆试试"),BorderLayout.CENTER);
        this.setVisible(true);
    }
}
class button extends JButton
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public button(String str)
    {
        
         super(str);
    


    }
    

    public void paint(Graphics g)
    {
        g.setColor(Color.RED);
        g.drawOval(0,0,getHeight(),getHeight());
        Graphics2D g2=(Graphics2D)g;
        g2.setFont(new Font("Arial",Font.ITALIC,getHeight()/2));
        g2.setPaint(Color.RED);
        g2.drawString("OK ",0,getHeight()/2);
        
    }
}