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Java³éÏóÀà - Java / Java EE

×î½üÔÚŪJava³éÏóÀ࣬ÓÐÒ»¸öShapeµÄ³éÏóÄÚ£¬ÓÃPoint,Line,CircleµÈÀ´¼Ì³ÐShape£¬²¢ÊµÏÖÒ»¶¨µÄ¹¦ÄÜ£¬ÆäÖÐdraw()¶¼Äܹ»ºÜºÃµÄʵÏÖ£¬µ«ÊÇҪʵÏÖÓû§»¥¶¯£¬ÈÃÓû§Ìí¼ÓͼÐÎÀàÐÍ£¬½«Ìí¼Ó²Ù×÷Ò²ÓóéÏóÀàÀ´ÊµÏÖ£¬µ«ÊÇ×ÜÊDZ¨´í£ºException in thread "main" java.lang.ClassCastException: java.lang.Object cannot be cast to vf.Shape
at vf.vftest.main(vftest.java:35)
»á²»»á×ÓÀàÔÚʵÏÖ³éÏó·½·¨read()ʱÓÐÎÊÌâŶ£¿ÏÂÃæÊÇÔ´´úÂ룬Çë¸ßÊÖÃǶà¶àÖ¸½Ì£¬Ð»Ð»ÁË£¡

package vf;


/**
 * @author Jhat
 * @date 2010-5-6 ÏÂÎç10:58:04
 */
public abstract class Shape
{
String name;
String arg;
public abstract void draw();
public abstract Object read(String name,String arg);
}


package vf;


/**
 * @author Jhat
 * @date 2010-5-6 ÏÂÎç10:59:04
 */
public class Point extends Shape
{
double x,y;
public void draw()
{
System.out.println("Point:"+"("+x+","+y+")");
}
public Object read(String name,String arg)
{
if(name.equalsIgnoreCase("point"))
{
Point point=new Point();
System.out.println(arg);
point.x=Double.parseDouble("2");
point.y=Double.parseDouble("8");
return point;
}
return false;
}
}


package vf;


/**
 *


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