Question

请帮忙改正这个JAVA小程序

照书打的，不知道怎样有错了。。。

import java.awt.*;
public class FancyPicture{

/**
* @param args
*/
public static void main(String[] args) {

DrawingPanel panel = new DrawingPanel(250.220);
Graphics 2D g2 = panel.getGraphics();
g2.translate(100,120);
g2.fillRect(-5,-5,10,10);
for(int i=0 ; i<=12 ;i++){
g2.setColor(Color.BLUE);
g2.fillRect(20,20,20,20);
g2.setColor(Color.BLACK);
g2.drawString(" "+i,20,20);
g2.rotate(Math.toRadian(30));
g2.scale(1.1,1.1);
}

}

}

=====================
以下是错误提示：
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
DrawingPanel cannot be resolved to a type
DrawingPanel cannot be resolved to a type
Syntax error on token "2D", delete this token
The method toRadian(int) is undefined for the type Math
The method scale(double, double) is undefined for the type Graphics

at FancyPicture.main(FancyPicture.java:9)

Answer 1

DrawingPanel 好像是javax/swine的类，所以要import对应的类名称。

Graphics 2D应该是Graphics2D

g2.rotate(Math.toRadian(30));
g2.scale(1.1,1.1);
可以改成
g2.rotate(Math.toRadian((float)30));
g2.scale(1.1f,1.1f);

Answer 2

DrawingPanel这个类是在哪里定义的，应该还有这个类才对。看你帖出来的是错在这里啊。另外把那个2D去掉吧。