问答题

___________________

【参考答案】


continue；
void
obj．print() ；
<上一题 目录 下一题>
热门 试题

问答题
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＞
问答题
bAlive = false;
相关试题