Part $1$: Make a box that can hold one item

This first part checks that you know how to use generics, write JavaDocs, and use the basic command line tools you$$ll use

throughout the semester. You need to write a generic class called SingleItemBox $($in a file called

SingleItemBox.java that you create$).$ It must have the following three features:

$1.$ a constructor that takes a single item and puts it in the box.

$2.$ a method called getItem$()$ which provides the item back to the user but does not remove it from the box $($this is

an $$accessor$,$ if you remember, sometimes called a $$getter$).$

$3.$ a single$-$parameter method called setItem$()$ which puts a new item into the box and returns the old item.

NOTES:

$$ Make sure to comment your code as you go in proper JavaDoc style.

$$ Item put in the box cannot be null $$ you must check this and throw an IllegalArgumentException with error

message "Item cannot be null!" if null is used.

Dimitriadis$/$Zhong Project $0$: Project Skills Check CS$310-$ Spring $2024$

$3$

To check that you$$ve got the right idea, we$$ve provided a class called BoxUsageDemo.java which creates boxes for

items of different classes. You should not alter this class to $$make it work$,$ but rather alter your box to allow the provided

code to work and print our yay$$s$.$ You can use the command "java BoxUsageDemo" to run the testing code defined in

main$().$ You could also edit this main$()$ to perform additional testing $($we won$$t be using BoxUsageDemo for testing,

it$$s just a demo for you$).$