class Ractangle {
double width;
double height;
public Ractangle(double w,double h){
width=w;
height=h;
}
void Area(){
System.out.println( width*height);
}
void perimeter(){
System.out.println(2*(width+height));
}
}
public class RectangleDemo {
public static void main(String args[]){
Ractangle ractangle=new Ractangle(40,50);
ractangle.Area();
ractangle.perimeter();
}
}
责任编辑：小草
