Must-do problems: Inheritance

150 min · Beginner

Every problem here asks you to design a small class family: decide what belongs in the parent, what each child adds, and where super(...) and super.method() go. Keep each variable of the child type, write the classes first, and run every test before opening a hint.

What you will learn

Put shared fields and methods in a parent and only the differences in each child
Pass values up with super(...) and reuse parent behaviour with super.method()
Predict constructor order and method calls through a multilevel chain
Design checked and unchecked custom exceptions, alone and as a family

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