关于java绘制不同色彩的图形

Question

package java01; import java.awt.*; import java.awt.geom.*; import javax.swing.*; public class java4{ public void paintComponent(Graphics g){ super.painComponent(g); Graphics2D g2 = (Graphics2D) g; float width = getSize().width-10; float Height= getsize().height/3-10; g2.setPaint(Color.red); g2.draw(new Line2D.Float(5,5,5+Width,5+Height)); g2.draw(new Line2D.Float(5,5+Height,5+Width,5)); g2.setPaint(new Color(192,128,64)); g2.fill(new Rectangle2D.Float(5,10+Height,Width,Height)); g2.fill(new Gradientpaint(5,5,Color.blue,5+Width,5,Color.yellow)); g2.fill(new Ellipse2D.Float(5,20+2*Height,Width,Height)); } public static void main(String [] argv){ JFrame f=new JFrame("色彩应用"); ColorShape p=new ColorShape(); p.setBackground(color.white); f.getContentPane().add(p); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setSize(640,480); f.setVisible(true); } }<p dir="ltr">这是我按照书上一点一点敲出来的，但是还是出现了以上的错误，我将我写的代码复制粘贴下来，大家帮我看看怎么修改，谢谢了！<p dir="ltr">