Ace Java 2025: Rock Your 'Thinking in Java' Challenge!

Question: 1 / 510

What must be true for a type to be used with FilledList?

It must implement a specific interface

It must have a default constructor

In order for a type to be used with FilledList, it must have a default constructor. This means that the class must have a no-argument constructor that is used to create objects of that class. Option A is incorrect because implementing a specific interface is not necessary for a type to be used with FilledList. Option C is incorrect because overriding the equals method is not a requirement for a type to be used with FilledList. Option D is incorrect because a class does not need to be declared as final in order to be used with FilledList. However, implementing a default constructor is necessary as it allows objects of that class to be initialized and used with FilledList.

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It must override the equals method

It must be a final class

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