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ShapeÀàÊǼ¸¸ö¾ßÌåͼÐÎÀàµÄ¸¸Àà
package cn.edu.uibe.poly;
public class Shape {
public void draw(){
System.out.println("Shape.draw()");
}
}

RectangleÀàÊÇShapeÀàµÄÒ»¸ö×ÓÀà
package cn.edu.uibe.poly;
public class Rectangle extends Shape {
@Override
public void draw() {
System.out.println("»­¾ØÐÎ");
}

}

CircleÀàÒ²ÊÇShapeÀàµÄ×ÓÀà
package cn.edu.uibe.poly;
public class Circle extends Shape{
@Override
public void draw() {
System.out.println("»­Ô²");
}
}

TriangleÀàÊÇShapeÀàµÄÁíÍâÒ»¸ö×ÓÀà
package cn.edu.uibe.poly;
public class Triangle extends Shape{
@Override
public void draw() {
System.out.println("»­Èý½ÇÐÎ");
}
}

ShapeDemoÀàÖÐËæ»úÉú³É¾ØÐΡ¢Ô²¡¢Èý½ÇÐΣ¬È»ºóÓÃShapeÀàÐ͵ÄÒýÓõ÷Óá£
package cn.edu.uibe.poly;
import java.util.*;
public class ShapeDemo {
Random rand = new Random();
public Shape createShape(){
int c = rand.nextInt(3);
Shape s = null;
switch(c){
case 0:
s = new Rectangle();
break;
case 1:
s = new Circle();
break;
case 2:
s = new Triangle();
break;
}
return s;
}
public static void main(


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