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AP Computer Science A: Object-Oriented Design Mastery Practi

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Q1Domain Verified
In the context of the "The Complete AP CSA Object-Oriented Programming Course 2026," which of the following best describes the fundamental purpose of encapsulation in object-oriented programming?
To promote code reusability by allowing classes to inherit properties and behaviors from other classes.
To bundle data (attributes) and the methods that operate on that data within a single unit (class), controlling access to the data.
To enable polymorphism, allowing objects of different classes to be treated as objects of a common superclass.
To abstract away complex implementation details, presenting a simplified interface to the user of an object.
Q2Domain Verified
Consider a scenario in "The Complete AP CSA Object-Oriented Programming Course 2026" where a `Shape` class has a method `calculateArea()`. If `Circle` and `Rectangle` are subclasses of `Shape`, and both override `calculateArea()` with their specific implementations, what is the primary OOP concept being demonstrated that allows a `Shape` reference to correctly invoke the appropriate `calculateArea()` method?
Abstraction, as the `Shape` class provides a generalized interface for area calculation.
Encapsulation, as the area calculation logic is hidden within each specific shape class.
Inheritance, as `Circle` and `Rectangle` inherit the method signature from `Shape`.
Polymorphism, specifically runtime polymorphism (method overriding), where the actual method executed depends on the object's runtime type.
Q3Domain Verified
In "The Complete AP CSA Object-Oriented Programming Course 2026," when discussing constructors, which of the following statements accurately differentiates between a default constructor and a no-argument constructor?
A default constructor is always generated by the compiler if no other constructors are defined, while a no-argument constructor must be explicitly defined by the programmer.
A default constructor initializes object members to default values (e.g., 0 for primitives, null for objects), while a no-argument constructor can perform custom initialization logi
A default constructor is a constructor that takes no arguments and is explicitly defined, while a no-argument constructor is implicitly generated by the compiler.
C) A default constructor is only available in Java, whereas a no-argument constructor is a general OOP concept.

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