Please help with java questions... If a class does not explicitly extend another

Question

Please help with java questions...
If a class does not explicitly extend another, it implicitly extends Object. T/F?
Use of protected instance variables undermines encapsulation: a small change in the superclass may "break" a subclass' implementation. T/F?
When a superclass method is overridden in a subclass, the subclass version may invoke the superclass version to do a portion of the work. T/F?
When objects of a particular class must be compared for equality, the class should override Object's equals method to compare the contents of the two objects. T/F?

Explanation / Answer

True

True

True

True

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