this is java and also write the explanation about your code,thank you

//Assign 4, HiringApp

package assign4_template;

import java.util.ArrayDeque;
import java.util.Queue;
import java.util.Deque;
import java.util.ArrayList;
import java.util.LinkedList;

import java.util.Scanner;

public class HiringApp {

    public static void main(String[] args) {

        //Define the data structures for 3 different groups of people:
        //  applicants
        //  current employees (those who were hired), 
        //  past employees (those who were fired)
        //
        //Hint: for queue: Queue<Person>
        //      for stack: ArrayDeque<Person>     
        
        //display the menu
        
        //get the menu choice
        
        //process user selected service request.
        
        //loop until the user decides to quit.
        
    }

    //other methods for code modularization
    //method for getting user choice
    public static int getChoice() {
        
        //display the menu 
        //get user choice
        //return user choice as an integer
        
        return -1;
    }

    //method for accepting an applicant and reurn this applicant as a Person object
    public static Person getApplication() {
        //display prompt for user to enter an applicant's name
        //get user input
        
        //display prompt for user to enter an applicant's degree
        //get user input
        
        //display prompt for user to enter an applicant's skill list
        //  (first how many skills, then enter skill one by one)
        //use a loop to get each skill
        
        //create a Person object using the name, degree, skill list
        //and return this Person object
        
        return null;
    }

    //Optional: (don't have to do this)
    //  You may want to separate hire and fire functionalities from main() and 
    //     add two more methods.
    //hire method
    //fire method
}

  
   
//Assign 4, Peron class.
//  Represent an applicant, or an employee

package assign4_template;

import java.util.ArrayList;

public class Person {
    
    //Item 3. in Assign 4 Document.

    //define data fields: name, degree, skill list ("Java, C#, C++", etc.)
    //  skill list: must be array list or linked list
    

    //define the constructor with given name, degree, and skill list

    //define getters

    //define setters

    //define toString()

}