9.4 (Opportunities for defects) Every additional line of code is an opportunity

Question

9.4 (Opportunities for defects) Every additional line of code is an opportunity for a defeat. Discuss the ways in which inheritance promotes defect reduction.

9.7 (protected vs private) Some programmers prefer not to use protected access, because they believe it breaks the encapsulation of the superclass. Discuss the relative merits of using protected access vs using private access in superclass.

9.11 (super) Explain two usages of the super keyword, and state some of the advantages of each type of usage.

9.12 (Using super) A method decode() is declared in a parent class, and also the child. How can you access the decode() of the parent from within the child?

2-3 sentences for each

Explanation / Answer

9.7) superclass' protected members are accessible by an indirect subclass.most compilers will complain that the extened class doesn't exist.(import object.classname)

9.11)most compilers will complain that the extened class doesn't exist.super is used to refer immediate parent class instance variable.super() is used to invoke immediate parent class constructor.super is used to invoke immediate parent class method.

9.4)able to reuse code for different classes by putting it in a common superclass

9.12)extending from virtual or abstract classes can use super.You can only use super in methods that are designated with the override keyword.

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