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Java: Variables and Data Types

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Why is using double for product prices risky in production code?

double can introduce rounding errors because binary floating-point cannot represent many decimal values exactly. A value like 19.99…

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Flashcard Study

Java: Variables and Data Types

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How should you choose a variable type in beginner Java?

Choose the type that matches the business meaning of the value. A quantity is a whole-number count, a…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

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Why use abstraction in Java?

Abstraction simplifies complex systems by hiding details. Abstraction allows you to define a class with essential attributes and…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

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How would you explain an interface’s role in a Java interview?

Interfaces define a contract that implementing classes must follow. An interface in Java specifies methods that a class…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

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How does compile-time access differ from runtime dispatch?

Compile-time access checks method existence; runtime dispatch executes the method. Compile-time access ensures that the method exists in…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

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What happens if you call a method not defined in a superclass?

A compile-time error occurs. Frame the concept in practical terms so you can explain it during interview discussion.…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

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Why is polymorphism beneficial in Java?

Polymorphism enhances flexibility and reusability. Polymorphism allows objects to be treated as instances of their superclass, enabling a…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

Front

Why might a ClassCastException occur with upcasting?

ClassCastException occurs if the actual object type doesn't match the cast. When you try to cast an object…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

Front

What is dynamic method dispatch?

It is the process where the JVM determines the method to invoke at runtime. Dynamic method dispatch allows…

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Flashcard Study

Java: Upcasting and Dynamic Dispatch

Front

How can upcasting impact method visibility?

Upcasting can restrict method access to those available in the superclass. When you upcast, you can only call…

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