Object Oriented Programming: The employee program for adding employee to the pay

Question

Object Oriented Programming:

The employee program for adding employee to the pay role, for searching the employee by id or by name.

The employee text file contains the name, salary, employee id of all the employees. It looks like this

First Name    Last Name    ID    Salary

John              Lee              100   $1000

Marie            Jr                  101    $1100

The program will have three classes. One for reading employee info from the text file. Second class for searching the employee by name or id. The third class will be used for sorting employee data by name or id and displaying on the screen. The fourth file be used for adding or deleting employee info.

The program will show options such

Press 1 for employee search by name

Press 2 for employee search by id

Press 3 for adding a new employee

Press 4 for deleting employee info

Press 5 for updating the info

Explanation / Answer

working java code

public class Employee implements Comparable<Employee>
{
   private String ssn;
   private String lastName;
   private String firstName;

   public int compareTo(Employee emp)
   {
       int compLasts = lastName.compareTo(emp.lastName);
       int compFirsts = firstName.compareTo(emp.firstName);
       int compSSN = ssn.compareTo(emp.ssn);

       if ((compSSN != 0) && (compLasts != 0) && (compFirsts != 0))
       {
           return compLasts;
       }
       else
       {
           throw new IllegalArgumentException("Empolyee already exists with that SSN.");
       }
   }

   public Employee (String socialSN, String ln, String fn)
   {
       ssn = socialSN;
       lastName = ln;
       firstName = fn;
   }

   public String toString()
   {
       return "Employee[SSN= " + ssn + ", Last Name= " + lastName + ", First Name= " + firstName + "]";
   }

   public String getLastName()
   {
       return lastName;
   }

   public String getFirstName()
   {
       return firstName;
   }

   public String getSSN()
   {
       return ssn;
   }

   public void setLastName(String setLN)
   {
       lastName = setLN;
   }

   public void setFirstName(String setFN)
   {
       firstName = setFN;

   }

   public void setSSN(String setSSN)
   {
       ssn = setSSN;
   }
}

import java.util.Scanner;
import java.util.*;

public class HMandTS_Tester
{
public static int menu()
{
    System.out.println("Choose one option from following : ");
   System.out.println("1) Add a new employee.");
   System.out.println("2) Delete an employee via SSN.");
   System.out.println("3) Retrive an employee via SSN.");
   System.out.println("4) List all employees.");
   System.out.println("5) Exit.");
   Scanner sc = new Scanner(System.in);
   return sc.nextInt();
}

public static void main(String[] args)
{
    HashMap<String, Employee> employeesByKey = new HashMap<String, Employee>();
    TreeSet<Employee> employeesByName = new TreeSet<Employee>();

   int menuStore = menu();
   while(menuStore != 5)
   {
      System.out.println();
      switch (menuStore)
      {
        case 1:
          Scanner input1 = new Scanner(System.in);

           System.out.println("Enter a SSN: ");
           String str1 = input1.nextLine();
          System.out.println("Enter Last Name: ");
          String str2 = input1.nextLine();
          System.out.println("Enter First Name: ");
          String str3 = input1.nextLine();

          Employee newEmp = new Employee(str1, str2, str3);

          employeesByKey.put(newEmp.getSSN(), newEmp);
          employeesByName.add(newEmp);

          System.out.println();
          break;

        case 2:
          Scanner input2 = new Scanner(System.in);

          System.out.println("Please enter the SSN of the employee you wish to delete: ");
          String delStr = input2.nextLine();

              if(employeesByKey.containsKey(delStr))
              {
              employeesByKey.remove(delStr);

              Iterator<Employee> iterator;
              iterator = employeesByName.iterator();

              while (iterator.hasNext())
              {
                  Employee iterEmp = iterator.next();
                  if (delStr.compareTo(iterEmp.getSSN()) == 0)
                  {
                      iterator.remove();
                  }
              }

              System.out.println("Employee removed.");
              System.out.println("");
          }

          else
          {
              System.out.println("No such SSN.");
              System.out.println("");
          }

          break;

        case 3:
          Scanner input3 = new Scanner(System.in);

          System.out.println("Please enter the SSN of the employee you wish to retrive: ");
          String retStr = input3.nextLine();

              if(employeesByKey.containsKey(retStr))
              {
           Employee recievedEmployee = employeesByKey.get(retStr);
           System.out.println(recievedEmployee);
           System.out.println("");

          }

          else
          {
                System.out.println("No such SSN.");
                System.out.println("");
          }

          break;

        case 4:
          Iterator iterator;
      iterator = employeesByName.iterator();

          if (employeesByName.isEmpty())
          {
            System.out.print("Tree Set is empty.");
      }

      else
      {
                while (iterator.hasNext())
            {
              System.out.print(iterator.next() + " ");
            }
      }
          System.out.println("");
      break;

      case 5:
        break;
   }
      menuStore = menu();
     }
   }
}

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