Please complete the following:

$$ Create a Main class with the main$()$ method which shows a menu of options for the user to choose from. It shows the following screen and calls the chosen method as listed; then the menu appears again, repeat until the user types $3$ to quit:

Menu

$1.$ Countries and Capitals $$ displays a list of countries and capitals

$2.$ Countries Info $$ displays the info returned by the $4$ functions of the CountryProcessor class.

$3.$ Exit $$ terminates the menu loop

$$ In a class called CountryList, displays all countries and their capitals in a JList $($e$.$g$.$ Canada: Ottawa$),$ in alphabetical order by country name. Use the data from the countries$-$and$-$capitals.txt file. When the user closes the window, show the Main.main$()$ menu.

$$ In a class called CountryProcessor, create a function named processCountries$()$ that calls all $4$ functions. Use the data from the countries$-$and$-$capitals.txt file.

Create a HashMap instance variable with country name as key, and its capital city name as value $($e$.$g$.$ "Canada": "Ottawa"$).$ Use streams and filters to create the following functions which do exactly what they say. In all cases, before printing, collect the result into a java collection or local variable $($e$.$g$.$ List, String, Integer, etc...$)$:

$1.$ printNumberOfCountries$()$

$2.$ printLongestCapitalCity$()$

$3.$ printShortestCountryName$()$

$4.$ printAllCountriesStartingWith$($String substring$)$

$$ JUnit $$ create unit tests to test the above $4$ functions.

$$ Create and upload $($as pdf$)$ the UML Class diagram showing the classes with their attributes, methods and relationships.

Page $3$ of $3$ November $2023$

Main class

main$()$ shows a menu of $3$ options: the menu repeats until the user choice is exit.

CountryList class $$ display all countries and capitals in a JList in alphabetical order by CountryName. Use countries$-$and$-$capitals.txt

CountryProcessor class $$ use countries$-$and$-$capitals.txt

processCoutries$()$ calls $4$ functions

$-$ HashMap instance country name $($key$)/$capital city $($value$)$

$-$ Use streams and filters to create a collection and print it$,$ for each of the functions:

$-$ printNumberOfCountries$()$

$-$ printLongestCapitalCity$()$

$-$ printShortestCountryName$()$

$-$ printAllCountriesStartingWith$($String substring$)$

Create Unit tests for the $4$ methods.

Create the UML class diagram