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Questions and Answers
What is the term for when one object invokes another object's method to request information or an action?
What is the term for when one object invokes another object's method to request information or an action?
What is the concept that allows different objects to respond to the same message in different ways?
What is the concept that allows different objects to respond to the same message in different ways?
What is the term for a technique where a subclass uses its own attribute or behavior instead of an inherited one?
What is the term for a technique where a subclass uses its own attribute or behavior instead of an inherited one?
What is a graphical representation of a system's static object structure?
What is a graphical representation of a system's static object structure?
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What is the term for a class that describes an object that outlives the execution of the program that created it?
What is the term for a class that describes an object that outlives the execution of the program that created it?
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What is the term for a relationship between objects where one object is a specialized version of another?
What is the term for a relationship between objects where one object is a specialized version of another?
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What is the term for the process of identifying relationships between objects and classes?
What is the term for the process of identifying relationships between objects and classes?
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What is the term for a class that describes an object that is created temporarily by a program and lives only during that program's execution?
What is the term for a class that describes an object that is created temporarily by a program and lives only during that program's execution?
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What is the term for a graphical representation of a system's object relationships and associations?
What is the term for a graphical representation of a system's object relationships and associations?
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What is the concept of encapsulating an object's internal structure and behavior?
What is the concept of encapsulating an object's internal structure and behavior?
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Study Notes
Object-Oriented Concepts
- An object instance is a specific person, place, thing, or event, along with its attribute values.
- Objects have behavior, identity, and class (logical grouping of similar objects).
- Behavior refers to the actions an object can perform, also known as methods or operations.
- Identity refers to the uniqueness of an object, ensuring no two objects are the same.
Classes and Objects
- A class is a set of objects that share common attributes and behavior.
- Classes can be referred to as object classes or logical groupings.
- Objects can be instances of a class, inheriting its attributes and behavior.
Inheritance
- Inheritance is the concept where methods and/or attributes from one class can be reused by another class.
- Inheritance enables code reuse and facilitates a hierarchical relationship between classes.
Generalization/Specialization
- Generalization/specialization is a technique that groups common attributes and behaviors into a supertype class.
- The supertype class is inherited by other classes, which may contain unique attributes and behaviors.
- Supertype is also referred to as an abstract or parent class, while the inheriting classes are called subtypes or child classes.
Object/Class Relationships
- Object/class relationships refer to natural business associations between objects and classes.
- These relationships can be represented using UML notation.
Multiplicity and UML Multiplicity Notations
- Multiplicity refers to the minimum and maximum number of occurrences of one object/class for a single occurrence of a related object/class.
- UML notation is used to represent multiplicity in class diagrams.
Association and Aggregation
- Association refers to a natural business association between objects and classes.
- Aggregation is a relationship where a larger "whole" class contains one or more smaller "parts" classes.
- Composition is a type of aggregation where the "whole" is responsible for creating and destroying its "parts."
Messages and Polymorphism
- A message is communication that occurs when one object invokes another object's method to request information or action.
- Polymorphism is the concept that different objects can respond to the same message in different ways.
- Override is a technique where a subclass uses its own attribute or behavior instead of an inherited one.
Organizing Objects and Identifying Relationships
- To organize objects and identify relationships, follow these steps:
- Identify associations and multiplicity
- Identify generalization/specialization relationships
- Identify aggregation relationships
- Prepare the class diagram
Class Diagrams and Object Association Matrix
- A class diagram is a graphical depiction of a system's static object structure, showing object classes and their relationships.
- An object association matrix is a tool used to identify relationships between objects and classes.
Persistent and Transient Object Classes
- A persistent class describes an object that outlives the execution of the program that created it (e.g., stored in a database).
- A transient object class describes an object created temporarily by the program and lives only during its execution.
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Description
This quiz covers the basics of object-oriented programming, including objects, attributes, instances, behavior, and identity. Learn about object classes and how they relate to attributes and behaviors.
