import java.awt.Graphics;
abstract class DrawTool {
public abstract void paint(Graphics g);
}
class CircleTool extends DrawTool{
public void paint(Graphics g){
g.drawLine(1,1,5,4);
}
}
class RectTool extends DrawTool{
public void paint(Graphics g){
g.drawRect(1,1,10,10);
}
}
class Text
{
public static void main(String args[])
{
DrawTool tool1 = new RectTool();
DrawTool tool2 = new CircleTool();
tool1.paint(g);
tool2.paint(g);
}
}
错误提示如下:
D:\javawork\book_3\02>javac DrawTool.java
DrawTool.java:22: 找不到符号
符号: 变量 g
位置: 类 Text
tool1.paint(g);
^
DrawTool.java:23: 找不到符号
符号: 变量 g
位置: 类 Text
tool2.paint(g);
^
2 错误