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C# C# Objects Encapsulation with Properties Accessor Methods

Posted by Jamie Baldaro
Jamie Baldaro
15,616 Points

Can't solve Challenge 2 of 2

I thought I understood all of the getter/setter bits, but apparently something i've done isn't quite right?

Does anyone have any idea what i've done wrong? Thanks

Frog.cs 
namespace Treehouse.CodeChallenges
{
    class Frog
    {
        private int _numFliesEaten;

        public int GetNumFliesEaten()
        {
             return _numFliesEaten;
        }

        public void  SetNumFliesEaten( _numFliesEaten value)
        {
            _numFliesEaten = value;
        }

    }
}

3 Answers

Lukas Dahlberg
Lukas Dahlberg
53,736 Points

In the arguments for your setter, you have _numFliesEaten value. You need to set the type and the argument name. (And you should set the argument name as something different than the private field.)

So, it should be: 

   public void  SetNumFliesEaten( int numFliesEaten)
    {
        _numFliesEaten = numFliesEaten;
    }
Jamie Baldaro
Jamie Baldaro
15,616 Points

That's brilliant. thank you :)

Feel like that was an obvious mistake and i just failed to see it >.<

Daniel W
Daniel W
1,341 Points
Daniel W
Daniel W
1,341 Points

Be careful! The special word "value" is used when you have a set method for a property, not regular methods:

    class Frog
    {
        private int _numFliesEaten;

        public int NumFliesEaten
         { //A property with get and set methods, replacing the ones you wrote.

            private get //We can tag the getter or setter with the private keyword to limit access from other classes.
            {
             return _numFliesEaten;
            }

            set
            {
                _numFliesEaten = value;
                Scream(value);     //Here value is whatever was passed when we change NumFliesEaten.
            }
         }

         private void Scream(int amount)
         {
            Console.WriteLine("I have eaten " + amount + " flies!");
         }

    }

Somewhere else in another class we could have:

Frog frog = new Frog(); 
frog.NumFliesEaten = 3; //This would call the set of the property of the Frog class, the "value" variable will be 3. 

frog._numFliesEaten = 3; //Wouldn't work, since the variable is private.
var somevalue = frog.NumFliesEaten //Wouldn't work, we have a private getter. This other class can't read the value.

a short and simple Property would be:

private int _numFliesEaten; //This can be removed.
public int NumFliesEaten{get;set;} //And we don't even have to bother with returns etc. In this case both get and set are public.
Ashenafi Ashebo
Ashenafi Ashebo
15,021 Points
Ashenafi Ashebo
Ashenafi Ashebo
15,021 Points

use "int" type in the setter method, not _numFliesEaten.

namespace Treehouse.CodeChallenges { class Frog { private int _numFliesEaten; public int GetNumFliesEaten () { return _numFliesEaten; }

          public void  SetNumFliesEaten(int value)
            {
               _numFliesEaten = value;  
            }

}

} use "int" type in the setter method, not _numFliesEaten.