[Solved] Why doesn’t this work?

Question

Stuck on the Java tutorial again.
Tried for another hour.
——
Update: Solved.

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

Answer 1

Albert Tan

Check the abstract method in Abstract class which has void return type not int or double.

And also constructors should have 1 argument which is area.

class Square extends Shape {
Square(int w) {
this.setWidth(w);
}
void area() {
int area = width*width;
System.out.println(area);
}
public void setWidth(int w) {
this.width = w;
}
}

class Circle extends Shape {
Circle(int w) {
this.setWidth(w);
}
void area() {
double area = Math.PI * width * width;
System.out.println(area);
}
public void setWidth(int w) {
this.width = w;
}
}

Answer 2

Thanks!!

Answer 3

Albert Tan

Change this

width * Math.PI * 2

To

Math.PI * width * width

Answer 4

Albert Tan

Area of circle is PI * r * r
Perimeter of circle is 2 * PI * r