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CSC123-01 Week 4 Object-Oriented Programming Recap

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Questions and Answers

What is a key property that sets constructors apart from normal methods in Java?

Constructors have the same name as the class (correct)
Constructors always return a value
Constructors must have a return type
Constructors are private

In Java, what does the toString() method do?

Performs mathematical calculations
Returns a string representation of an object (correct)
Checks if an object is null
Creates a new object instance

How are constructors different from other methods in Java classes?

Constructors are used to initialize objects when they are created, while other methods are used to perform specific tasks (correct)
Constructors can only be called once, while other methods can be called multiple times
Constructors are public, while other methods can have different access modifiers
Constructors are used for inheritance, while other methods are used for polymorphism

How does Java process arguments and variable assignments for primitive types?

By value (C) Signup and view all the answers

What is the significance of the keyword 'private' in the Java class provided?

It restricts access to the member only within the class it is declared (A) Signup and view all the answers

How can you avoid the ambiguity of variable shadowing in Java?

Prefixing global variables with 'this' (D) Signup and view all the answers

What happens when objects are destroyed in Java?

Memory consumed by the objects is freed up (A) Signup and view all the answers

What does a solid (filled) diamond shape attached to a whole class represent in UML?

Composition relationship (B) Signup and view all the answers

Which type of relationship exists between objects in a Composition?

Strong and permanent (A) Signup and view all the answers

How can you differentiate between Composition and Aggregation in UML diagrams?

Composition represents a strong relationship, while Aggregation represents a weak relationship (A) Signup and view all the answers

Why is it significant for objects in a Composition to have a strong relationship?

To ensure data encapsulation and information hiding (C) Signup and view all the answers

What defines a composition in object-oriented programming?

An association where one object owns another object, and the owned object cannot exist without the owner object (A) Signup and view all the answers

In the context of object-oriented programming, what characterizes an aggregation?

Both objects can exist independently (C) Signup and view all the answers

What is polymorphism in Java?

The ability of a Java object to take the shape of objects belonging to their parent classes (A) Signup and view all the answers

What is the instanceof operator in Java used for?

To check if an object belongs to a specific class (C) Signup and view all the answers

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