e0904.java

java小程序

public class E0904
{
public static void main(String args[])
{
double l;
String str;
ShapeR sr=new ShapeR(10,20);
Shape s=new ShapeR(30,20);
s=sr;
l=s.perimeter();
str=s.getType();
System.out.println(str+"周长为："+l);
}
}