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PPT03_Problem_Domain_Classes - Developing Problem Domain...

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Developing Problem Domain Classes Naming Conventions Class names begin with a capital letter Customer, Boat Attribute names begin with lowercase letters, with subsequent words capitalized address, phoneNumber Method names begin with lowercase letters, with subsequent words capitalized, and usually contain a verb describing what the method does setAddress, getPhoneNumber Developing a PD Class Definition Class Definition Structure Class definition The Java code written to represent a class Class header Line of code that identifies the class and some of its characteristics Keywords: public Indicates class has public availability class Indicates this line of code is a class header Class Definition public class classname // Header { // Attribute Definitions // Method Definitions } Developing a PD Class Definition Identifying Attributes Characteristics of an object Descriptive Attributes Attributes that describe intrisic facts about an object Naming Attributes Attributes that identify a particular object Control Attributes Attributes that are necessary for the application and are used in the services provided by the attribute Coupling Attributes Attributes that create the relationships between two different types of objects Defining Attributes Define attributes by declaring variables for each one Specify accessibility of a variable: public Allows any class to access the variable directly private Prohibits direct access Requires accessor methods for access by other classes Accessible only from within class where it is defined protected Page 1 of 6
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Allows both subclasses and classes defined within the same package to have direct access Attributes are generally private. Identifying Services Processes that the object must perform for other objects Identify the verbs in the process description of the application Methods are the set of detailed operations to perform a service Types of services provided Simple services (60%-80%) Create – instantiates a new object Connect – connects an object to another Access – gets or sets attributes Disconnect – disconnects two objects Delete – Deletes an object Complex Services Calculate – calculations on attributes Monitor – Monitoring events to respond to Query – Calculates without modifying an attribute Writing Methods Object interaction via client-server model
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PPT03_Problem_Domain_Classes - Developing Problem Domain...

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