下面是一个Applet程序，其功能是在窗口中绘制3个半径递增的圆，并用RGB三原色对这3个圆填充。要求建立一个绘制圆的类，实现根据指定颜色进行填充的功能，在主程序中通过调用这个类的方法实现圆的绘制。请改正程序中的错误(有下划线的语句)，使程序能输出正确的结果。 注意：不改动程序的结构，不得增行或删行。 程序运行结果如下：

import java.applet.*; import java.awt.*; import java.awt.*; /* ＜applet code="ex22_3.class" width=800 height=400 ＞ ＜/applet＞ */ class CanvasCircle extends Canvas{ private Color cCircle; public CanvasCircle(Color c){ cCircle = c; } public void paint(Graphics g){ int dimCricle, xCircle, yCircle; Dimension sizeCurrent = getSize(); if (sizeCurrent.width ＞ sizeCurrent.height){dimCricle = sizeCurrent.width; } else{dimCricle = sizeCurrent.height; } g.setColor(cCircle); xCircle = (sizeCurrent.height - dimCricle) / 2; yCircle = (sizeCurrent.width - dimCricle) / 2; g.fillOval(xCircle, yCircle, dimCricle, dimCricle); } } public class ex22_3 extends Applet{ public void init(){GridBagLayout gbl = new GridBagLayout();GridBagConstraints gbc = new GridBagConstraints();CanvasCircle circleNew;setLayout(gbl);gbc.weightx = 1.0;gbc.weighty = 1.0;gbc.fill = GridBagConstraints.BOTH;circleNew = new CanvasCircle(Color.red);gbl.setConstraints(circleNew, gbc);add(circleNew);gbc.weightx = 1.5;gbc.weighty = 1.5;circleNew = new CanvasCircle(Color.green);gbl.setConstraints(circleNew, gbc);add(circleNew);gbc.weightx = 2.0;gbc.weighty = 2.0;circleNew = new CanvasCircle(Color.blue);gbl.setConstraints(circleNew, gbc);add(circleNew); } } ex22_3.h tml ＜HTML＞ ＜HEAD＞ ＜TITLE＞ex22_3＜/TITLE＞ ＜/HEAD＞ ＜BODY＞ ＜applet code="ex22_3.class" width=800 height=400 ＞ ＜/applet＞ ＜/BODY＞ ＜/HTML＞

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