#8 abstract classes + error-handling + exceptions

Question 1

how is an abstract method similar to an interface

Answer 1

it has a method signature (which includes abstract modifier) but no body

Question 2

where are abstract methods implemented

Answer 2

in its subclasses

Question 3

what makes a class abstract

Answer 3

> it has the abstract modifier in the heading
it has at least one abstract method
it can’t instantiate objects (its subclasses can)

Question 4

compile-time (syntax) errors

Answer 4

errors in code construction

underlined in red

Question 5

runtime errors

Answer 5

operations that are illegal or impossible to execute

exceptions

Question 6

logic errors

Answer 6

a problem with the design or algorithm

Question 7

test coverage (code coverage)

Answer 7

how much code is executed by a set of test cases