我试图画一辆车作为一个多边形的摆动和移动它左右时，点击按钮
问题是我不能在运行程序时在屏幕上显示按钮，也不能使它们工作
我不知道在使用多边形时如何实现用户界面中的按钮
这是我的code:-

package java2d;

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

public class Java2D extends JFrame{

    int xValues[];
    int yValues[];
    private JButton Right, Left;

    public Java2D() {
        super( "Drawing lines, rectangles and ovals" );
        setSize( 500, 300 );
        setVisible( true );
    }

    public void paint( Graphics g ) {

        int xValues[] = { 40, 100, 130, 230, 260, 320, 320, 40 };
        int yValues[] = { 120, 120, 40, 40, 120, 120, 170, 170 };
        Polygon polygon1 = new Polygon( xValues, yValues, 8 );
        g.setColor(Color.blue);
        g.drawPolygon( polygon1 );

        Right = new JButton("Right");
        Left = new JButton("Left");

        Right.setSize(50, 50);
        Left.setSize(50, 50);

        Right.setLocation(100, 200);
        Left.setLocation(200, 200);

        g.add(Right);
        g.add(Left);

    }

    public void actionPerformed(ActionEvent event) {
        if(event.getActionCommand().equals("Right")){
            for (int i=0; i<xValues.length;i++) {
            xValues[i] = xValues[i] + 10;
            yValues[i] = yValues[i] + 10;
            }
        }

        if(event.getActionCommand().equals("Left")){
            for (int i=0; i<xValues.length;i++) {
            xValues[i] = xValues[i] + 10;
            yValues[i] = yValues[i] + 10;
            }
        }

    repaint();
    }

    public static void main(String[] args) {
        Java2D application = new Java2D();
        application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    }
}

谢谢