Flashcards

Quick study sessions to strengthen memory and retain key concepts.

Flashcard Study

Java: Code Reading and State Safety

Front

Why should fields in a Java class often be private?

Private fields prevent external modification and maintain object integrity. Private fields encapsulate the data within a class, preventing…

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Flashcard Study

Java: Code Reading and State Safety

Front

Why is immutability crucial in multi-threaded applications?

Immutable objects are inherently thread-safe. In multi-threaded applications, immutable objects offer thread safety as they cannot be modified…

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Flashcard Study

Java: Code Reading and State Safety

Front

What does encapsulation achieve in Java?

Encapsulation hides internal state and enforces controlled access. Encapsulation in Java ensures that an object's internal state is…

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Flashcard Study

Java: Code Reading and State Safety

Front

How would you explain a common mistake when exposing collections in an interview?

Allowing direct access leads to uncontrolled modifications. Directly exposing collections can lead to external code modifying their content,…

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Flashcard Study

Java: Code Reading and State Safety

Front

How to refactor a class to improve encapsulation?

Use private fields with public getters and controlled setters. To enhance encapsulation, fields should be private, with public…

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Flashcard Study

Java: Code Reading and State Safety

Front

Why avoid exposing mutable static fields?

They can be changed from anywhere, leading to inconsistent states. Mutable static fields are shared across all instances…

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Flashcard Study

Java: Code Reading and State Safety

Front

How would you explain a safer design for handling collections in a class in an interview?

Use unmodifiable views or defensive copying. Exposing collections directly allows external modifications, breaking encapsulation. A safer design is…

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Flashcard Study

Java: Code Reading and State Safety

Front

How can immutability enhance object safety?

Immutable objects cannot be altered, preventing accidental changes. Immutability ensures that once an object is created, its state…

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Flashcard Study

Java: Code Reading and State Safety

Front

How would you explain an invariant in object design in an interview?

An invariant is a condition that must always be true for an object. Invariants ensure that an object…

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Flashcard Study

Java: Code Reading and State Safety

Front

What issues arise from compile-safe but runtime-unsafe designs?

They may pass compilation but fail at runtime due to logic errors. Compile-safe designs can still harbor logic…

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