Question

I need help with this one method in java. Here are the guidelines. Only public Employee[] findAllBySubstring(String find).

EmployeeManager

EmployeeManager

- employees : Employee[] - employeeMax : final int = 10 -currentEmployees : int

<<constructor>> EmployeeManager + addEmployee( type : int, fn : String, ln : String, m : char, g : char, en : int, ft : boolean, amount : double) + removeEmployee( index : int) + listAll() + listHourly() + listSalary() + listCommision() + resetWeek() + calculatePayout() : double + getIndex( empNum : int ) : int + annualRaises() + holidayBonuses() : double + increaseHours( index : int, amount : double) + increaseSales( index : int, amount : double) + findAllBySubstring(find : String) : Employee[] - RabinKarp(name : String, find : String) : int - stringHash(s : String) : int - charNumericValue(c : char) : int - RabinKarpHashes(s : String, hashes : int[], pos : int, length : int) : int - linearSearchRecursive(nameHashes : int[], findHash : int, pos : int) : int

public EmployeeManager()

Constructor, creates the Employee array, sets currentEmployees to 0.

public void addEmployee(int, String, String, char, char, int, Boolean, double)

Takes an int representing the type of Employee to be added (1 – Hourly, 2 – Salary, 3 – Commission) as well as the required data to create that Employee. If one of these values is not passed output the line, “Invalid Employee Type, None Added”, and exit the method. If an Employee with the given Employee Number already exists do not add the Employee and output the line, “Duplicate Not Added”, and exit the method. If the array is at maximum capacity do not add the new Employee, and output the line, "Cannot add more Employees".

public void removeEmployee(int)

Removes an Employee located at the given index from the Employee array.

public void listAll()

Lists all the current Employees. Outputs there are none if there are none.

public void listHourly()

Lists all the current HourlyEmployees. Outputs there are none if there are none.

public void listSalary()

Lists all the current SalaryEmployees. Outputs there are none if there are none.

public void listCommission()

Lists all the current CommissionEmployees. Outputs there are none if there are none.

public void resetWeek()

Resets the week for all Employees.

public double calculatePayout()

Returns the total weekly payout for all Employees.

public int getIndex(int)

Given an Employee Number, returns the index of that Employee in the array, if the Employee doesn’t exist retuns -1.

public void annualRaises()

Applies annual raise to all current Employees.

public double holidayBonuses()

Outputs and returns the total holiday bonus of all Employees.

public void increaseHours(int, double)

Increase the hours worked of the Employee at the given index by the given double amount.

public void increaseSales(int, double)

Increase the sales of the Employee at the given index by the given double amount.

public Employee[] findAllBySubstring(String find)

This method will return an array of all the Employees in the EmployeeManager that contain the substring passed. Create a new Employee array with the size of the number of current Employees. For every Employee call upon the RabinKarp method giving the search string as the concatenation of that Employee’s first and last name (no spaces). If the substring is found in the Employee add that Employee to the new array. After all have been checked, return the array.

private int charNumericValue(char c)

Given a character, returns the numeric value of the character, starting with A – 0 up to Z – 25. This should treat upper and lower case the same; that is passing it ‘A’ will return 0, passing it ‘a’ will also return 0. If a letter is not passed this method should create and throw an InvalidCharacterException as provided.

private int stringHash(String s)

Given a string, return the hash value of the entire String. Use a base 26 number system to create the hash as described in class. This will be needed only to find the hash of the substring that is being searched for and the base case for finding all substring hashes in the search string.

private int RabinKarpHashes(String s, int[] hashes, int pos, int length)

Finds the hash values of all substrings of size length in the String s, starting at index pos and down. These values are stored in the passed hashes array. This method must be recursive, using the technique as described in the Rabin-Karp lecture.

private int linearSearchRecursive(int[] data, int key, int pos)

This is a recursive linear search. Return the position of key in the data array, or -1 if it is not present. This method must be recursive.

private int RabinKarp(String name, String find)

Does the preprocessing of finding the hash for the substring, find using the stringHash method and the hashes of substrings in the search string using RabinKarpHashes method. Calls upon linearSearchRecursive to determine if the substring hash is in the collection of hashes and returns the result.

Answer 1

public class EmployeeManager
{
private Employee[] employees;
private final int employeeMax = 100;
private int currentEmployees;
public EmployeeManager()
{

     employees[] = new Employee[employeeMax];

     currentEmployees = 0;

}

public void addEmployee(int eType, String fn, String ln, char m, char g, int empNum, boolean ft, double a)
{
    double sales = 0.0, hoursWorked = 0.0;
    switch (eType)
    {
       case 1: employees[currentEmployees] = new HourlyEmployee(fn, ln, m, g, empNum, ft, a, hoursWorked);
                currentEmployees++;
                break;

        case 2: employees[currentEmployees] = new SalaryEmployee(fn, ln, m, g, empNum, ft, a);
                currentEmployees++;
                break;

        case 3: employees[currentEmployees] = new CommissionEmployee(fn, ln, m, g, empNum, ft, a, sales);
                currentEmployees++;
                break;
    }
}

//Add Employee
            case 2:
                String fn, ln;
                char mi, g, f;
                boolean ft = true;
                do
                {
                    System.out.println("\n1. Hourly");
                    System.out.println("2. Salary");
                    System.out.println("3. Commission");
                    System.out.print("Enter Choice: ");
                    subInput1 = in.nextInt();

                    if(subInput1 < 1 || subInput1 > 3)
                    {
                        System.out.println("Invalid Choice! Choose again.");
                    }
                }while(subInput1 < 1 || subInput1 > 3);

                System.out.print("Enter Last Name: ");
                ln = in.next();
                System.out.print("Enter First Name: ");
                fn = in.next();
                System.out.print("Enter Middle Initial: ");
                mi = in.next().charAt(0);
                System.out.print("Enter Gender: ");
                g = in.next().charAt(0);
                System.out.print("Enter Employee Number: ");
                en = in.nextInt();
                System.out.print("Full Time? (y/n): ");
                f = in.next().charAt(0);
                if(f == 'n' || f == 'N')
                {
                    ft = false;
                }

                if(subInput1 == 1)
                {
                    System.out.print("Enter wage: ");
                }
                else if(subInput1 == 2)
                {
                    System.out.print("Enter salary: ");
                }
                else
                {
                    System.out.print("Enter rate: ");
                }
                amount = in.nextDouble();

                em.addEmployee(subInput1, fn, ln , mi, g, en, ft, amount);
                em.removeRedundancies();
                break;

/**** HourlyEmployee is a subclass of superclass Employee. Here's my code . *******/

public class HourlyEmployee extends Employee
{
private double wage;
private double hoursWorked;

public HourlyEmployee(String fn, String ln, char m, char g, int empNum, boolean ft, double w, double h)
{
    super (fn, ln, m, g, empNum, ft);
    wage = w;
    hoursWorked = h;
    hoursWorked = 0.0;
}

@Override
public String toString()
{
    return this.getEmployeeNumber() + "\n" + lastName + ", " + firstName + middleInitial + "\n" + "Gender: "
     + this.getGender() + "\n" + "Status: " + fulltime + "\n" + "Wage: " + wage + "\n" + "Hours Worked: " + hoursWorked + "\n";
}

@Override
public double calculateWeeklyPay()
{
    if (hoursWorked > 40)
    {
        wage = wage * 2;
    }

    return wage * hoursWorked;
}

@Override
public void annualRaise()
{
    wage = (wage * .05) + wage;
}

@Override
public double holidayBonus()
{
    return wage * 40;
}

@Override
public void resetWeek()
{
    hoursWorked = 0.0;
}

public double plusHoursWorked(double amount, double h)
{
    while (amount <= 0)
    {
        System.out.println("Invalid value entered, please try again");
    }

    return amount + h;
}

}

public abstract class Employee
{
protected String firstName;
protected String lastName;
protected char middleInitial;
protected boolean fulltime;
private char gender;
private int employeeNum;

public Employee (String fn, String ln, char m, char g, int empNum, boolean ft)
{
    firstName = fn;
    lastName = ln;
    middleInitial = m;
    gender = g;
    employeeNum = empNum;
    fulltime = ft;
}

public int getEmployeeNumber()
{
    return employeeNum;
}

public void setEmployeeNumber(int empNum)
{
    while (empNum <= 10000 && empNum >= 99999)
    {
        System.out.print ("Invalid input, please try again: ");
    }

    if (empNum >= 10000 && empNum <= 99999)
    {
        employeeNum = empNum;
    }
}

public String getFirstName()
{
    return firstName;
}

public String getLastName()
{
    return lastName;
}

public char checkGender(char g)
{
    if (g != 'M' || g != 'F')
    {
        g = 'F';
    }
    return g;
}
public char getGender()
{
    return gender;
}

@Override
public boolean equals(Object e2)
{
    if (this.employeeNum == ((Employee)e2).employeeNum)
    {
        return true;
    }
    else
    {
        return false;
    }
}

@Override
public String toString()
{
    return employeeNum + "\n" + lastName + ", " + firstName + "\n" + "Gender:" + gender + "\n" + "Status:" + fulltime + "\n";
}

public abstract double calculateWeeklyPay();

public abstract void annualRaise();

public abstract double holidayBonus();

public abstract void resetWeek();
}