Overriding and overloading, potential mix-up. Overriding methods to replace the original code with something different. Overloading methods to increase the number of methods available.
Constructors and their (default) construction. No-arg constructors, particularly default ones, are needed else beware of pitfalls in the super callers.
A brief look on static, static methods cannot access non-static variables and methods.
Misreading questions is hazardous to one's answers.
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