Comp Sci Ch. 2

Question 0

What is an attribute?

Answer 0

An objects values that represent its state

Question 1

What is an object?

Answer 1

Part of a java program that represents a real object

Question 2

What is a method?

Answer 2

A group of programming statements given a name so we can use them when we need them

Question 3

What is a class?

Answer 3

The data-type/blueprint of an object. Represents a concept

Question 4

What is encapsulation?

Answer 4

The means by which an object protects and manages its own info

Question 5

What is inheritance?

Answer 5

The means by which a class can be created by other classss

Question 6

What is polymorphism?

Answer 6

The idea by which we we can refer to objects if different but related types in the same way

Question 7

What do we directly interact with in programs?

Answer 7

Objects

Question 8

Can there be multiple objects in a class?

Answer 8

Yes

Question 9

What do methods do?

Answer 9

The functions of the program

Question 10

This is when one class can be used to derive other classes

Answer 10

Inheritance

Question 11

What is object and method in system.out.println (“hello world”) ?

Answer 11

System.out is object. Println is method. Hello world is parameter

Question 12

Where does the info we feed into a method considered?

Answer 12

Parameter

Question 13

What is abstraction?

Answer 13

Hiding details

Question 14

How do we know if something is abstract?

Answer 14

We don’t need to think about the inner workings

Question 15

What is a character string in java?

Answer 15

An object

Question 16

What can you not do with a literal string?

Answer 16

Break it across two lines

Question 17

What is contametation?

Answer 17

Splicing together multiple strings

Question 18

What does a concatenator do?

Answer 18

String together numbers and letters working left to right

Question 19

What do you use parentheses for in a concatenator?

Answer 19

To add stuff

Question 20

What is an escape sequence?

Answer 20

A series of character that represent a special character

Question 21

What is a variable a name for?

Answer 21

A location in memory

Question 22

How do you declare a variable?

Answer 22

Specify it’s name and the info it will hold

Question 23

What changes the value of a variable?

Answer 23

An assignment statement

Question 24

What must you specify when using a variable?

Answer 24

The variable type

Question 25

What just you make sure you don't do when reassigning a variable?

Answer 25

Not put a data type again

Question 26

What does putting final before a data type do?

Answer 26

Make it a constant

Question 27

What are the data types for intergers?

Answer 27

Byte, short, int, and long

Question 28

What are the data types for numbers with decimals?

Answer 28

Float and double

Question 29

What is the data type for characters?

Answer 29

Char

Question 30

What is the Boolean data type?

Answer 30

Boolean

Question 31

What are booleans good | For?

Answer 31

True and false statements

Question 32

What is a trade off of double?

Answer 32

It only allows 15 sig figs

Question 33

What does % mean in java?

Answer 33

Remainder

Question 34

What does the char function use?

Answer 34

Unicode

Question 35

Why is the assignment operater a low precedence?

Answer 35

Cause the right side is finished then a value is assigned

Question 36

What is a widening conversion?

Answer 36

Going from a data type with less bits to more bits

Question 37

What is a bad data type conversion?

Answer 37

Int to double

Question 38

What are 3 types of conversions?

Answer 38

Assignment, arithmetic promotion, and casing

Question 39

What is assignment conversion?

Answer 39

Assigning an Internet variable to a double variable

Question 40

What is arithmetic promotion?

Answer 40

Dividing a double and an interger to get another double?

Question 41

What is casting?

Answer 41

Doing something and specifying the output data type

Question 42

What are enumerated values?

Answer 42

Values outside of a class and the main method

Question 43

What happens when we say to string something?

Answer 43

Memory is allocated for it

Question 44

What is the process of creating an object?

Answer 44

Instantiation

Question 45

Are strings powerful?

Answer 45

Yes

Question 46

What do strings have on their own?

Answer 46

Their own class

Question 47

What do index numbers start at?

Answer 47

0

Question 48

What are strings?

Answer 48

Objects that you can use methods on, so they have special functionalities

Question 49

How are interferes and doubles made into objects?

Answer 49

Wrapper class

Question 50

What is autoboxing?

Answer 50

Converting a primitive data type into an object

Question 51

What is a class library?

Answer 51

A collection of classes that contain methods

Question 52

What is the java standard class library?

Answer 52

Additional functionalities that come with java

Question 53

What classes are included in the java standard class library?

Answer 53

System and string

Question 54

What is a package?

Answer 54

A collection of classes, methods, and more that can be shared with others

Question 55

What do you do to use classes not readily in java?

Answer 55

Import them

Question 56

What does a * mean?

Answer 56

The wild card-import all classes in a package

Question 57

What is the scanner class?

Answer 57

A part of java.util that let's us get input from the user

Question 58

What do applets not have?

Answer 58

A main method

Question 59

What is an applet?

Answer 59

A java app meant to be run in a web browser