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Name 4 guidelines for naming a class |
*Start with a capital letter
*Be centered in the top compartment
*Be written in a boldface font
*Be written in italics if the class is abstract |
CCBI |
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How many compartments may a class have? |
As many compartments as required to describe the class |
Lots |
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How is an instance of an object shown |
Object name followed by the class, i.e., Ford : Car. It is also underlined. |
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What are attributes? |
Attributes are used to represent the details of a class. They describe the properties of an instance. |
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How is an attribute shown (diagrammed)? |
Either inline or by a relationship. |
Two ways |
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How is the visibility of an attribute represented? |
Use the following symbols: +, -, #, or ~ for public, private, protected, or package, respectively |
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How is the name of an attribute normally capitalized? |
Typically the first letter is lowercase, and the first letter of each subsequent word is capitalized. |
It's all up from the start. |
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What is the type of an attribute? |
another classifier, typically a class, interface, or built-in type like int. |
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How is the multiplicity of an attribute represented? |
multiplicity ::= [lower..upper] use * to represent 0 or more. [1 .. *] indicates one or more an integer [3] represents exactly 3 |
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What are the property strings of an attribute? |
denote such things as ordering or uniqueness. They are surrounded by {} and separated by commas. |
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What are attribute constraints? |
one or more restrictions placed on an attribute. They may be natural language or use a formal grammar such as the OCL. |
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How is an optional attribute diagrammed? |
The attribute name is preceeded by a "/". |
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How do you represent a set of ordered attributes? |
-orderedAttrib[4]{ordered} |
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If the uniqueness constraint of an attribute is not specified what is the default value? |
{unique} |
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How do denote that an attribute is not unique? |
-orderedAttrib[4]{ordered, no unique} |
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Name some common attribute properties. |
readOnly, union, subsets <attribute-name>, composite |
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What are constraints? |
restrictions placed on an element |
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What common property must all constraints have? |
They must evaluate to a boolean value. |
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What are static attributes? |
attributes of the class rather than of an instance of the class |
part of the type |
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How are static attributes designated? |
They are underlined. |
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What are operations? |
Operations are features of classes that specify how to invoke a particular behavior. |
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Write the general syntax expression for an operation. |
visibility name ( parameters ) : return-type {properties} |
VNPRP |
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Write the general syntax expression for an operation parameter. |
direction parameter_name : type [ multiplicity ]
= default_value { properties } |
DPTMDP |
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What are the 4 possible parameter directions. Indicate how each type is used by the operation. |
in, out, inout, return |
IOIR |
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What is the purpose of an operation constraint? |
A constraint defines a contract that indicates how an operation interacts with the rest of the system. |
Contract |
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What is a precondition? |
A precondition is a constraint that specifies the state of the system that must exist before an operation is invoked. |
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Show an example of a precondition. |
use "precondition: foo must equal bar" for example |
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What is a postcondition? |
A post condition establishes the post operation state of the system that must be met. |
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What is a bodyCondition? |
A constraint that restricts the possible values of the return values. |
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What is a query operation? |
A query operation is a constraint that indicates that the operation does not change the system state in any way. |
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Is an exception a constraint? |
No, but an exception may be expressed in a similar manner. |
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How is an exception to an operation indicated? |
Use a note attached by a dotted line. |
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What is a static operation? |
A static operation is an operation that is invoked on the class itself rather than an instance of a class. |
acts on the class |
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How is a static operation indicated? |
The signature is underlined. |
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What is a method? |
A method is the actual implementation of an operation. |
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How is a method noted? |
There is no specific notation for an operation. |
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What is an abstract class? |
A class that has one or more operations without signatures. |
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