Attribute Syntax and Visibility Quiz

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What is the main reason the for loop works in Java?

It always expects a class implementing the Iterator interface
It always expects a class implementing the Iterable interface (correct)
It always expects a class implementing the Collection interface
It always expects a class implementing the List interface

What is the main purpose of method overloading in Java?

To improve the performance of the code by having multiple methods with the same name but different implementations
To allow a class to have multiple methods with the same name and implementation
To improve the readability of the code by having multiple methods with the same name but different implementations (correct)
To allow a class to have multiple methods with the same name and different return types

What is the key difference between method overriding and method overloading in Java?

Overriding involves having multiple methods with the same name in the same class, while overloading involves changing the implementation of a method in a subclass
Overriding involves changing the return type of a method, while overloading involves changing the number or data type of the arguments
Overriding involves changing the implementation of a method in a subclass, while overloading involves having multiple methods with the same name in the same class (correct)
Overriding involves changing the name of a method in a subclass, while overloading involves having multiple methods with the same name in the same class

When selecting an overloaded method to execute, what is the main factor that the Java compiler considers?

The static types of the arguments in the methods (D) Signup and view all the answers

Which of the following is the most accurate statement about method overloading in Java?

Method overloading allows a class to have multiple methods with the same name and different input parameters (D) Signup and view all the answers

What does the 'public' attribute visibility mean?

Accessible by every other object (D) Signup and view all the answers

Which parameter direction indicates that it is used for passing data into a method?

in (B) Signup and view all the answers

What is the purpose of the 'protected' attribute visibility?

Accessible by the class itself and its subclasses (C) Signup and view all the answers

What differentiates a composite data type from a class?

Instances are value objects with immutable properties (D) Signup and view all the answers

In attribute notation, what does [] or [o..] represent?

An unlimited number of values with no upper limit (D) Signup and view all the answers

What is the significance of using {unique} as a property for an attribute?

{unique} prevents duplicates for the attribute's values (D) Signup and view all the answers

What is the main principle behind Dependency Injection (DI)?

Java objects should be independent. (A) Signup and view all the answers

In Dependency Injection, what is a common problem caused by not using DI?

Increase in maintainability issues. (D) Signup and view all the answers

What is a key benefit of Dependency Injection (DI) over manual object instantiation?

Better maintainability. (C) Signup and view all the answers

Which design pattern focuses on updating views whenever items are added or removed?

Observer Pattern (C) Signup and view all the answers

In the context of Observer pattern, what is a key decision point between inheritance and interface style implementation?

Style of method invocation (D) Signup and view all the answers

What does the Visitor design pattern aim to do when dealing with multiple types of sources with common operations?

Add a new operation over all sources without modifying them. (D) Signup and view all the answers

What is the main principle behind the Liskov Substitution Principle?

Objects of a subtype should be able to replace objects of a supertype without affecting the correctness of the program. (C) Signup and view all the answers

According to the Liskov Substitution Principle, which of the following is considered a bad design choice when using inheritance?

All of the above. (D) Signup and view all the answers

Which of the following is NOT a violation of the Liskov Substitution Principle?

The subclass has a more specific return type than the superclass. (A) Signup and view all the answers

In the example provided, what is the correct way to design the new type of Deck that cannot be shuffled?

Create a new class UnshufflableDeck that implements the Deck interface. (A) Signup and view all the answers

Which of the following is NOT a reason why the Liskov Substitution Principle is important in object-oriented programming?

It helps to ensure that subclasses have the same performance characteristics as their superclasses. (A) Signup and view all the answers

Which of the following statements about the ignore fragment in sequence diagrams is correct?

It has no operand and represents messages that are irrelevant. (A) Signup and view all the answers

In the context of the Law of Demeter, which of the following statements is correct?

The code of a method should only access instance variables of the current object, arguments of the method, and any new objects created within the method. (C) Signup and view all the answers

Which of the following statements about the Interface Segregation Principle (ISP) is correct?

Client code should depend on interfaces that represent specific roles directly relevant to each client. (D) Signup and view all the answers

In the context of design patterns, what is the purpose of the Singleton pattern?

To ensure that only a single instance of a class can exist in the system at any time. (B) Signup and view all the answers

Which of the following statements about the par fragment in sequence diagrams is correct?

It relaxes the chronological order between messages in different operands, allowing execution paths to be interleaved. (A) Signup and view all the answers

What is the purpose of the assert fragment in sequence diagrams?

To represent mandatory interactions, where deviations that occur in reality but are not included in the diagram are not permitted. (B) Signup and view all the answers

Which design pattern is used to encapsulate a command request as an object?

Command (D) Signup and view all the answers

What is the purpose of the strict fragment in sequence diagrams?

It represents a fixed sequence of events across lifelines, where the order of event occurrences on different lifelines is significant. (C) Signup and view all the answers

Which design pattern is used to define a new operation to a class without changing the class itself?

Visitor (B) Signup and view all the answers

In the context of sequence diagrams, what is the purpose of a time constraint?

To specify a point in time or a time period for event occurrence. (B) Signup and view all the answers