Lecture 12 - Quality, Strings, Generics

Question 1

External Quality

Answer 1

External Quality (User Perspective) - No crashes, good performance.

Question 2

Internal Quality

Answer 2

Internal Quality (Developer Perspective) - Code is understandable, code is testable, code is easy to update.

Question 3

Don’t duplicate code

Answer 3

It leads to late propagation. It is a bug caused because you forgot to make changes in all locations that you copied the code to/from.

Question 4

Cyclomatic Complexity and Testing

Answer 4

It is the number of linearly independent paths in the program. 0-5 Perfect. 6-10 Difficult to test and understand. >30 Extremely complex.

If your method has a CC of 6, you need at least 6 methods to cover all the paths.

Question 5

Java Generics

Answer 5

Java will automatically wrap and unwrap primitive types. This is autoboxing.

Question 6

Generic Arugments

Answer 6

Generic Arguments are compile time only. Run-time does not know about the type specialization. We can place type constraints on generic type arguments.