UML noob

Question

I'm really new to UML and I am not sure how to set up the code for the last one:

+ Polygon (sideLength: double, numSides: int)
+ Polygon()
+ equals(p: Polygon) : boolean

the equals() parameter is throwing me off, can someone help?

Answer 1

I'm going to translate each line to its C++ equivalent code, then explain a little bit about each...

+ Polygon (sideLength: double, numSides: int)
Polygon(double sideLength, int numSides);

This one is a constructor declaration for Polygon class which accepts two arguments to initialize some private (possibly) data members.

+ Polygon()
Polygon();

This one is a default constructor for the same class.

+ equals(p: Polygon) : boolean

bool equals(Polygon p);

This one is a public member function declaration of the Polygon class whose argument is a Polygon type. It accepts an object of its own class and after performing some operation on that, returns true or false as the result.

●●All pieces together●●

class Polygon {
public:
Polygon() {}
Polygon( double sideLength, int numSides ) {
// initialize some data members using those two parameters
}

bool equals(Polygon p) {
// Do some stuff here, then
return true or false
}

//...
};