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AP Computer Science Videos 110 videos

AP Computer Science 1.1 Classes and Objects
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AP Computer Science 3.5 Classes and Objects 186 Views


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Description:

AP Computer Science: Classes and Objects Drill 3, Problem 5. Which of the following is not an object?

Language:
English Language

Transcript

00:00

Hurry and here's your shmoop du jour brought to you

00:04

by the boy band rivalries of the late nineteen nineties

00:07

Not since the civil war has the nation so divided

00:10

consider the following declarations album j equals new album no

00:15

strings attached and sync two thousand five which of the

00:20

following is not an object In case we get year

00:28

ok and hear your potential answers Okay where we where

00:32

we live think right again We go back to the

00:35

differences between primitive data type can an object classes and

00:40

primitive types are not objects And when we talk about

00:43

primitive types don't mean grandpa hunt and peck methods in

00:46

java There eight primitive data types Remember imagers which store

00:50

the whole Numbers in 32 bits of computer memory In

00:53

practical terms that means a number of a positive or

00:56

negative value of around two point one Four billion with

00:59

a b plenty for most uses but its whole numbers

01:02

on leah's faras energies are concerned A long is just

01:05

like an imager But using sixty four bits of memory

01:08

that amount of space could represent a value of over

01:11

nine Quintillion again the whole numbers only and if along

01:16

Is a longer imager Well you might guess that a

01:18

short would be a shorter in inger lever and you'd

01:21

be exactly right there you get just sixteen bits to

01:24

do your bidding resulting in numbers up to greater than

01:26

about thirty two thousand a bite is even shorter than

01:30

that eight bits sign that gives you a maximum value

01:33

of one hundred twenty seven These smaller data types can

01:36

be used to save space in situations where you need

01:39

to start a lot of smaller values William data types

01:42

are very simple and store only a true or false

01:44

value Char stores a single sixteen unicode character or here

01:50

meaning practically any alfa numerical punctuation mark symbol or foreign

01:54

language character and floats and doubles are floating point values

01:59

Floating point values aren't quite exact representations of real numbers

02:03

They're more like an approximation but allow you to get

02:06

too deep with decimal places good for some things but

02:09

when precision is required such as one working with money

02:12

use energy instead So far five given declarations which is

02:17

not an object alvin j equals new album yet we're

02:20

creating a new object of the album class and it's

02:22

Called j well this one's an object so it's not

02:25

our answer by the way in sync what about backstreet

02:29

her and seeing had a couple hits but justin timberlake

02:31

was carrying that whole outfit like paul mccartney All right

02:36

well string k equals yada yada Well this too is

02:39

an object Drinks aren't a primitive data type Their collection

02:42

of char data type in array with a few methods

02:45

tagging along totally an object during l equals yeah same

02:50

thing here drink in equal j get name l that's

02:53

an andre too and that leaves into em and as

02:57

we know it are not objects their primitive data type

03:00

so it leaves us with just option d that's the

03:02

answer and a newfound respect for backstreet fact Three back 00:03:07.53 --> [endTime] all right No

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