Question $4\mathrm{.}1$: Write a TV class $($without main method$)$ and declare its instance variables. The Default channel is $1,$ the default volume level is $1$ and the TV is off.

$1.$ The turnOn method turns on this TV$.$

$2.$ The turnOff method turns off this TV$.$

$3.$ The setChannel method sets the new channel if the TV is on and the new

channel is between $1$ and $120.$

$4.$ The setVolume method sets the new volume if the TV is on and the new volume

is between $1$ and $7.$

$5.$ The channelUp method increases the channel number by $1$ if the TV is on and

the channel is less than $120.$

$6.$ The channelDown method decreases the channel number by $1$ if the TV is on

and the channel is greater than $1.$

$7.$ The volumeUp method increases the volume number by $1$ if the TV is on and

the channel is less than $7.$

$8.$ The volumeDown method decreases the volume number by $1$ if the TV is on

and the volume is greater than $1.$

$9.$ In the main class TestTV:

Run :

Question $4\mathrm{.}2$: Modify the code in order to initialize the first tv by the same values $($channel $=30$ and volumeLevel $=3$ when creating the tv$1).$

a$.$ create an object tv$1$ b$.$ turn on the tv$1$

c$.$ set the channel to $30$ d$.$ set volume to $3$

e$.$ create an object tv$2$

f$.$ turn on the tv$2$

g$.$ increase the channel of the tv$2$

h$.$ increase the volume of the tv$2$

i$.$ Show the channel and the volume

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