Chapter 2

Question 1

Object

Answer 1

Something with which we can interact with the program

Question 2

Class

Answer 2

defines objects

Question 3

System.out is an

Answer 3

object

Question 4

print is different than println because

Answer 4

it does not advance to the next line

Question 5

Objects are abstract because

Answer 5

we don’t have to think about it’s internal details

Question 6

Encapsulation

Answer 6

Each object handles its own state

Question 7

getter

Answer 7

used to ask an object the value of a variable

Question 8

setter

Answer 8

allows you to ask an object to change the value

Question 9

String is an object

Answer 9

yes

Question 10

concatenation

Answer 10

when you use the + operator to connect a very long string

Question 11

An escape sequence

Answer 11

begins with back slash, tell program to treat next letter specially

Question 12

tab

Answer 12

\t

Question 13

newline

Answer 13

\n

Question 14

double quote

Answer 14

"

Question 15

three steps to make a variable

Answer 15

instantiate: declare
initialize: store
use

Question 16

assignment

Answer 16

stores a value into a variable

Question 17

declaring multiple variable at once is

Answer 17

bad form

Question 18

constant

Answer 18

final

Question 19

type

Answer 19

a category or set of data values

Question 20

3 primitive types

Answer 20

int
double
boolean

Question 21

widening conversions

Answer 21

safe, do not lose information (int to double)

Question 22

narrowing conversions

Answer 22

often lost information (double to in)

Question 23

casting

Answer 23

we want a floating point result when dividing them, we cast a total

result = (double) total / count;

Question 24

pointer

Answer 24

a reference in the address, points to where the object is

Question 25

you have to instantiate object

Answer 25

myBook = new Book (“Ender’s Game”, 1985);

Question 26

strings

Answer 26

No “new” operator necessary

Question 27

strings are

Answer 27

immutable, cannot be changed

Question 28

String length

Answer 28

.length()

Question 29

String uppercase

Answer 29

.toUpperCase()

Question 30

String lowercase

Answer 30

.toLowerCase()

Question 31

Substring

Answer 31

name.subtring(start,end);

Question 32

Index

Answer 32

.indexOf();

Question 33

instance variables within an object

Answer 33

are private

Question 34

to get the hyp variable total we use __, and to set total we use ___

Answer 34

getTotal, setTotal

Question 35

int stores

Answer 35

32 bits

Question 36

double stores

Answer 36

64 bits

Question 37

right and left hand side of an assignment statement can contain

Answer 37

the same variable

count = count + 1;

Question 38

new object

Answer 38

myBook = new Book (“Ender’s Game”, 1985);

Question 39

New scanner

Answer 39

Scanner Scan = new Scanner(System.in);

Question 40

import scanner

Answer 40

import java.util.Scanner;

Question 41

intCompareTo

Answer 41

indicates whether string comes before or after text, -1 for before vice versa

Question 42

utilities

Answer 42

java.util;

Question 43

random

Answer 43

(int)(Math.random();

Question 44

store number value

Answer 44

var = scan.nextInt();

Question 45

primitive identifiers store,

an object stores

Answer 45

actual value, references to objects

Question 46

String class is a part of

Answer 46

java.lang;

Question 47

why are static classes called static?

Answer 47

they belong to the classes as a whole, not objects

Question 48

How to replace all of one character

Answer 48

.replaceAll(thing you want to change, new thing)