怎样设计并调用两个不同的paint()方法？

Question

java有现成的api,何必去重新写一个呢?

Answer 1

int id;
public void paint()
{
 if(id==0)
 { //*****;
    super.paint();
 }
 else
  if(id==1)
 {
   //*****
   super.paint();
  }
}
可否？
也相当于是两个函数了

Answer 2

可能是我没说清楚,我是想用api函数的
 如果单独画直线时,这样
public void paint(graphics g){
.....
g.drawLine(x1,y1,x2.y2);
}
单独画多边形，这样
public void paint(graphics g){
......
g.drawPolygon(xpoint[],ypoint[],npoint);
}
上面的大家都知道，问题是我在一起用时，
repaint()时怎么写，如果用repaint（）也不知道它会调用哪个啊，
或者上面两个函数某一个该怎么改一下？
是否只能设计两个不同参数的类？

Answer 3

public interface Operation {
    public void paint();
}public class OperationLine implements Operation {
    public void paint(graphics g){
       g.drawLine(x1,y1,x2.y2);
    }
}public class OperationPolygon implements Operation {
    public void paint(graphics g){
       g.drawPolygon(xpoint[],ypoint[],npoint); 
}

Answer 4

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;/*
 * Created on 2005-4-11
 *//**
 * @author yanbin.qiu
 */
public class TestGraphics extends JFrame
{
    public static void main(String[] args)
    {
        final JPanel panel= new JPanel();
        panel.setLayout(new FlowLayout());
        JButton b1 = new JButton("画圆");
        JButton b2 = new JButton("画框");
        panel.add(b1);
        panel.add(b2);
        
        b1.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                Graphics g = panel.getGraphics();
                g.setColor(Color.blue);
                g.clearRect(120,40,500,500);
                g.drawOval(120,40,400,400);
            }
        });
        
        b2.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                Graphics g = panel.getGraphics();
                g.setColor(Color.red);
                g.clearRect(120,40,500,500);
                g.draw3DRect(120,40,400,400,true);
            }
        });
        
        JFrame test= new TestGraphics();
        test.setSize(640,480);
        test.setContentPane(panel);
        test.setVisible(true);
        test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}