Must-do problems: Enums

120 min · Beginner

Every problem here is built around one or two enums: decide which values form a fixed list, what data and behaviour each constant carries, and how input text becomes a constant. Write the enum first, then main, and run every test before opening a hint.

What you will learn

Model fixed lists of values as enums with fields, methods and constant-specific bodies
Turn input text into constants safely with valueOf() and fromCode() lookups
Use exhaustive switch expressions and enum state machines
Combine enums with interfaces, arrays and exceptions in one program

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