Page 219 - AP Computer Science A, 7th edition
P. 219
{
private double radius;
//constructor
public Circle(double circleRadius, String circleName)
{
super(circleName);
radius = circleRadius; }
public double perimeter()
{ return 2 ∗ Math.PI ∗ radius; }
public double area()
{ return Math.PI ∗ radius ∗ radius; }
}
public class Square extends Shape {
private double side;
//constructor
public Square(double squareSide, String squareName)
{
super(squareName);
side = squareSide; }
public double perimeter() { return 4 ∗ side; }
public double area()
{ return side ∗ side; }
}
NOTE
1. It is meaningless to define perimeter and area methods for Shape—thus, these are declared as abstract methods.
