COMP 1451

Question 1

What are libraries?

Answer 1

Set of dynamically loadable libraries that java can call at runtime - provide set of known facilities, abstract interface to tasks that such as network access that are typically resource heavy on operating system

Question 2

What do you need to know when looking up new classes in Java libraries?

Answer 2

You need to know the interface not the implemetnation

Question 3

What are Maps?

Answer 3

collections that contain pairs of values of which one is a key and one is value

Question 4

Should fields be private?

Answer 4

Heck yes, they should never be public pretty much

Question 5

What is encapsualtion?

Answer 5

encapsulation is wrapping code and data together in a single unit. Fully encapsulated objects will have all data members set to private

Question 6

What is Coupling?

Answer 6

The degree of direct knowledge that one element has of another or how much a change in A forces change in B

Question 7

Cohesion - what it is?

Answer 7

The degree to which a Class has a single purpose. The more cohesive a Class is the easier to it is to maintain and re-use

Question 8

What is refactoring?

Answer 8

Making a bucnh of small changes to code without changing what it does

Question 9

What is regression testing?

Answer 9

egression testing involves re-running test, Use of a test rig or test harness can relieve some of the burden.

Question 10

What is a test harness?

Answer 10

A test class designed to replaces human activity

Question 11

What is method polymorphism?

Answer 11

Overloading a constructor

Question 12

What is Dynamic method lookup?

Answer 12

The process of determining which method signature is denoted at runtime

Question 13

What is a static reference

Answer 13

A declared type of reference

Question 14

What a dynamic reference is?

Answer 14

The type of the object a reference points to

Question 15

What does a compiler do?

Answer 15

check for static type violations

Question 16

What are the namespaces?

Answer 16

Used to organize code into logical groups

Question 17

Why must the package statement be the first statement in the source file?

Answer 17

Because the compiler needs to know what the file heirarchy is

Question 18

Are HashMaps a collection?

Answer 18

No.

Question 19

What is subtyping?

Answer 19

Objects of a subtyype can be used where objects of a supertype are expected

Question 20

What is Casting?

Answer 20

When we assign a subtype object address to a supertype reference

Question 21

What is inherited form a super or parent class?

Answer 21

all non-private fields methods and constructors

Question 22

What is a concrete class?

Answer 22

Has no abstract methods defined

Question 23

What is an interface?

Answer 23

Completely abstract class

Question 24

Can a class have multiple parent classes?

Answer 24

Oh sure there bud but it must be inherited from interfaces because because that way there is no competing implementation