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Procedural Shape, Chapter 6: Objects and Data Structures, Clean Code, Robert C Martin
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public class Square { | |
public Point topLeft; | |
public double side; | |
} | |
public class Rectangle { | |
public Point topLeft; | |
public double height; | |
public double width; | |
} | |
public class Circle { | |
public Point center; | |
public double radius; | |
} | |
public class Geometry { | |
public final double PI = 3.141592653589793; | |
public double area(Object shape) throws NoSuchShapeException { | |
if (shape instanceof Square) { | |
Square s = (Square) shape; | |
return s.side * s.side; | |
} else if (shape instanceof Rectangle) { | |
Rectangle r = (Rectangle) shape; | |
return r.height * r.width; | |
} else if (shape instanceof Circle) { | |
Circle c = (Circle) shape; | |
return PI * c.radius * c.radius; | |
} | |
throw new NoSuchShapeException(); | |
} | |
} |
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