Task:

You are given a text file where each line is a sentence. Write a Java program that will do

the following:

$$ Read the text file line by line and store each unique word across all sentences

and their respective occurrence count. You may use Java$$s built$-$in HashMap

class defined in java.util.HashMap.

$$ Implement a method getCount$($String word$)$ that takes a word as input and

returns the number of times it appears across all sentences.

$$ Implement a method getMostFrequentWords$($int k$)$ that returns a list of

the k most frequently occurring words across all sentences.

$$ Implement a method getLeastFrequentWords$($int k$)$ that returns a list of

the k least frequently occurring words across all sentences.

$$ Implement a user interface that displays a menu to the user and allows them to

select an option to execute each of the above methods.

Constraints:

$$ All words are case$-$insensitive.

$$ Words are separated by spaces and punctuation marks should be ignored.

Error Handling:

$$ The program should handle potential errors gracefully.

$$ For example, it should check if the file exists and can be read, and it

should handle potential issues with the file$$s content $($e$.$g$.,$ lines that don$$t

contain any words$).$

User Interface:

$$ The program should provide a user$-$friendly interface that allows the user to

easily select an option and see the results.

Sample Input:

A text file named sentences.txt with the following content:

The quick brown fox jumps over the lazy dog

Pack my box with five dozen liquor jugs

Jackdaws love my big sphinx of quartz

How vexingly quick daft zebras jump

Bright vixens jump; dozy fowl quack

Sample User$-$Interactions: $($Bold indicates user inputs$)$

Input file content has been read from $$sentences$.$txt$$

Please select an option:

$1.$ Get the count of a specific word

$2.$ Get the most frequent words

$3.$ Get the least frequent words

$4.$ Exit

$1$

Enter the word:

the

The word 'the' appears $2$ times.

Please select an option:

$1.$ Get the count of a specific word

$2.$ Get the most frequent words

$3.$ Get the least frequent words

$4.$ Exit

$2$

Enter the number of words:

$3$

The $3$ most frequent words are $[$the$,$ my$,$ quick$]$

Please select an option:

$1.$ Get the count of a specific word

$2.$ Get the most frequent words

$3.$ Get the least frequent words

$4.$ Exit

Enter the number of words:

$3$

The $3$ least frequent words are $[$brown$,$ fox, over$]$

Please select an option:

$1.$ Get the count of a specific word

$2.$ Get the most frequent words

$3.$ Get the least frequent words

$4.$ Exit

$4$

Exiting...

Note: The output for getMostFrequentWords and getLeastFrequentWords can vary

depending on the order of the words in the HashMap.