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AP Computer Science Videos 113 videos
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AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?
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?
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
Full Transcript
- 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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