Exam 2 Review

Question 1

Why do we use the Software Development Life Cycle?

Answer 1

It allows for more efficiency in the coding process

Question 2

Difference between functional and nun-functional requirements

Answer 2

Functional: deals with inputs/outputs/behaviors

Nonfunctional: everything else (language… whatever)

Question 3

The sooner you catch a mistake, the cheaper it is. (T/F)

Answer 3

True

Question 4

Polymorphism

Answer 4

a feature of java that allows a method to be selected at runtime… enables inheritances/interfaces

Question 5

How do you write a comparable interface? What is required?

Answer 5

the class must ‘implements Comparable’

there must be a x.compareTo(y) method

Question 6

How to write a comparator interface?

Answer 6

implements Comparator

includes a compare(x,y) method

Question 7

Substitutability Principle

Answer 7

child can be substituted for anywhere a parent can go

Question 8

Stacks order?

Answer 8

LIFO

Question 9

Queues order?

Answer 9

FIFO

Question 10

What is necessary for a binary search?

Answer 10

A sorted array!!!!

Question 11

Generally accepted phases of the Software Development Life Cycle..

Answer 11

Requirements, Design, Implementation and Testing, Maintenance

Question 12

Can interfaces be instantiated?

Answer 12

No

Question 13

Can an interface implement a method? If so, how?

Answer 13

Yes, using the default keyword

Question 14

Interfaces have a constructor (T/F)

Answer 14

False

Question 15

Classes implement an interface (T/F)

Answer 15

True

Question 16

Classes can only have one parent class but can implement many interfaces (t/f)

Answer 16

True

Question 17

Comparable interface defines the natural order for a class…(t/f)

Answer 17

True

Question 18

Comparator interface defines a total ordering based on what ur looking for (t/f)

Answer 18

True

Question 19

Abstract classes can be instantiated (t/f)

Answer 19

False

Question 20

Can abstract classes provide an implementation for methods?

Answer 20

Yes

Question 21

What are benefits of an abstract class?

Answer 21

It’s very easy to define variables/methods/constructors for classes to use this abstract classes.

Question 22

Pop() vs peek()

Answer 22

Pop() = removes and returns the top

Peek() only looks at the top

Question 23

Errors and Exceptions inherit from

Answer 23

Throwable

Question 24

Exceptions are short for

Answer 24

Exceptional Events

Question 25

3 types of exceptions and the difference between them?

Answer 25

Errors: “unpreventable”

Unchecked Exceptions:
“programmer mistakes”

Checked Exceptions: “anticipated potential problems”