Dissection of Modeling Attribute
Modeling attribute dissection involves examining all of the elements
- Derived attribute indicator: Optional
- Attribute name: Required
- Data type: Required
- Assignment operator and default value: Optional
- Constraints: Optional
- Visibility: Required before code generation
- Class attribute: Optional
Attribute Modeling
System of Objects
Objects do not exist in isolation, but as part of a larger system of objects that must interact with each other. The most fundamental relationship between objects is the has a relationship.
The Java implementation of the Book class has three String attributes: title, author, and ISBN. String is a class, and the relationship between the Book class and the String class is illustrated in Figure 4-3.
The preceding figure is an example of a Booch class diagram. Grady Booch developed this notation for representing the relationships between the classes that comprise a software system. The simplest relationship is the has a relationship. The filled-in circle at one end of the connecting line indicates that it is the Book that has the String.
