java如何计算矩形的面积和周长？
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 ra...全部
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();
}
}。收起
