Parameters

The inputs required by a behavior are often called Parameters and like state, a data type is required in the definition of a parameter.

The format for representing parameters in a behavior:  

BehaviorName(Parameter: DataType)

The format for representing a behavior that has no parameters:  

BehaviorName()

Class example:

The Login behavior of a class called Player class may look like this:

Login(Password: String)

The parenthesis (brackets) which follow the name of the behavior are used to identify any parameters that are required for the behavior to function. In this case of the Login behavior, a parameter called Password which has a data type of String is required by the behavior for it to function. In other words, the Player class has a Login function but it needs a String password to execute.

The Logout behavior of the Player class looks like this:

Logout()

You will notice that the parenthesis for this behavior are empty. This behavior does not require any parameters to execute.

There are two behaviors in the Player class which are responsible for increasing and decreasing the Player class Health state:

IncreaseHealth(Increase: Integer)
DecreaseHealth(Decrease: Integer)

Both of these behaviors require an Integer (whole number) parameter. In other words, these behaviors need to know how much to increase or decrease the Player Health state. As you might imagine, a Player may incur varying amounts of damage or gain varying amounts of health depending on the various interactions within game play.