Tried to solve the test for abstract classes in Java course. My Code fails in hidden test case #3 and i dont know why.

Question

https://code.sololearn.com/cQm0f4hg0z9U/?ref=app

Answer 1

your are not using the abstraction concept, normally you should extend the classes.
class Square extends Shape{....}
class Circle extends Shape {....}

your code works without that tho.
the issue is in
double result= this.width*this.width * Math.PI;

changing the order of the variables to

double result= Math.PI * this.width*this.width;
works, I don't know how is it even relevant.

Answer 2

Damn shoud've seen that. Added "extends Shape " changed the order, Codes works totally fine. Thank you.