عرض عملي: تحديث فئة Java قديمة خطوة بخطوة

خطوة بخطوة

1. Show the legacy Product class: fields, getters, setters, equals, hashCode, toString.
2. Run the existing tests so you have a safety net.
3. Replace the class with a record; remove the setters and fix the callers.
4. Planned mistake: the class had a List<String> tags. Passing a list that the caller changes later breaks immutability. Fix: copy it in the compact constructor with List.copyOf.
5. Replace the if/else instanceof chain with a sealed interface and a switch.
6. Run the tests again and list what you removed.

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