Must-do problems: Static and Final

110 min · Beginner

Every problem asks you to choose, field by field, what belongs to each object and what belongs to the whole class, and what may never change. Decide that before writing code, test on the samples, and run every test before opening a hint.

What you will learn

Decide for each field whether it belongs to every object or to the class
Generate IDs and running totals with static counters and keep them correct
Write utility classes of static methods with a private constructor
Use static final constants and static blocks for rules and one-time set-up

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