Exam Preparation Angela

Question 1

Proper names of Classes State and Behaviour

Answer 1

Fields, and Methods

Question 2

Creating an object from a class

Answer 2

Type name = new Constructor()

Question 3

During inheritance what does the subclass inherit from the superclass

Answer 3

Non private Fields and Methods

Question 4

Name 3 main errors and what they are

Answer 4

Syntax (compile time error), Runtime (java error thrown), and Logical (programmer error)

Question 5

What are the two steps of Static typing

Answer 5

Declaration (Car c), Initalization (= new Car)

Question 6

What does marking something as final mean

Answer 6

No changes can be made after compilation

Question 7

What’s special about Final lists

Answer 7

The internals can be changed (add, remove, etc) however a new list can not be made from a list declared final

Question 8

What is the format for the Ternary operator

Answer 8

Variable x = (boolean expression) ? resultIfTrue : resultIfFalse

Question 9

Static Method use

Answer 9

result = math.ceil(parameters)

Question 10

Local Method use

Answer 10

resultVar = name(parameters)

Question 11

Object methods use

Answer 11

obj.name(parameters)

Question 12

Requirements to overload a Method or Constructor

Answer 12

Type, order, and number of parameters

Question 13

T/F a(obj) == b.clone(obj)

Answer 13

True, objects yes

Question 14

T/F a[] {…} == b.clone[] {…}

Answer 14

False, values like in no

Question 15

Public visibility

Answer 15

All places can access public

Question 16

Private visibility

Answer 16

Only the class can access public fields and methods

Question 17

Protected

Answer 17

Visible in everything but the outside world (not descendants)

Question 18

What do subclasses inherit

Answer 18

Non private methods and fields

Question 19

What is called implicitly when when extending a superclass constructor is a subclass

Answer 19

super(superclass values)

Question 20

How are polymorphism and compilers related

Answer 20

The compiler won’t check the type of a method call until runtime

Question 21

What are three features of Abstract classes

Answer 21

Classes extend then, they can not be instantiated, they are allowed to have instance variables

Question 22

What are Anonymous classes and what is their general formatting

Answer 22

Unnamed implicit classes

public void name() {
    AnonName n = new AnonName() {
        String name = "A string";
        public void anonMethod() {
            S.o.pln(name);
        }
    };
    n.greet();
}

Question 23

Name five common exceptions

Answer 23

NullPointer
ArrayIndexOutOfBounds
ClassCast
Interrupted
IO