Salary Calculator - HomeWork

package salarycalculator;

import java.text.DecimalFormat; // Decimal Format - for showing 2 digits after dot
import java.util.InputMismatchException; // InputMismatch Exception util
import java.util.Scanner; // Scanner util

public class SalaryCalculator {

    /* Needed variables */
    public static String workerName;
    public static double basicSalary;
    public static boolean workerOfTheMonth;
    public static int experienceInYears, numberOfChildren;

    /* Tax variables */
    public static float taxForSalaryBet0To4000;
    public static float taxForSalaryBet4000To6000;
    public static float taxForSalaryMore6000;

    /* Convert data from args to the tax variables  */
    public static void convertDataFromArgs(String[] args) {
        try
        {
            taxForSalaryBet0To4000 = Float.parseFloat(args[0]);
            taxForSalaryBet4000To6000 = Float.parseFloat(args[1]);
            taxForSalaryMore6000 = Float.parseFloat(args[2]);
        }

        /* Safe Fail Checks */
        catch (NumberFormatException ex)
        {
            System.err.println("Fatal Error: One of the arguments is invaild (not a float)");
            System.err.println("Error Code: " + ex);
            System.err.println("Program has terminate itself.");
            System.exit(1);
        }

        catch (ArrayIndexOutOfBoundsException ex2)
        {
            System.err.println("Fatal Error: No anought arguments (need 3)!");
            System.err.println("Error Code: " + ex2);
            System.err.println("Program has terminate itself.");
            System.exit(2);
        }
    }

    /* Print the menu */
    public static void printMenu() {
        System.out.println("******************************************");
        System.out.println("*       I: Information about worker      *");
        System.out.println("*       N: Print net salary              *");
        System.out.println("*       V: Print gross salary            *");
        System.out.println("*       T: Print Tax                     *");
        System.out.println("*       P: P-Print pay slip              *");
        System.out.println("*       E: End program                   *");
        System.out.println("******************************************");
    }

    /* Get worker's data */
    public static void getData() {
        try
        {
            Scanner s = new Scanner(System.in);

            System.out.println("Please enter worker name:");
            workerName = s.nextLine();

            System.out.println("Please enter worker's basic salary:");
            basicSalary = s.nextDouble();

            System.out.println("Is the worker \"Worker of The Month\"?");
            workerOfTheMonth = s.nextBoolean();

            System.out.println("Please enter worker's experience in years:");
            experienceInYears = s.nextInt();

            /* Salary bounus per child only counts when the worker is "Worker of The Month" */
            if (workerOfTheMonth)
            {
                System.out.println("How much children does the worker have?");
                numberOfChildren = s.nextInt();
            }
        }

        catch(InputMismatchException ex)
        {
            System.err.println("Fatal Error: Input Mismatch!");
            System.err.println("Error Code: " + ex);
            System.err.println("Retrying . . . ");
            getData();
        }
    }

    /* Get net salary */
    public static double getNetSalary() {
        double Tax = (calcTaxOfBaseSalary() + (calcTaxOfBonus()));
        return (getGrossSalary() - Tax);
    }

    /* Get gross salary
    * Gross salary = basic salary + bonus
    *
    *
    * Bonues:
    * 1. Monthly bonus: If the worker is the "Worker of The Month", 5% bonus
    *    per child for the first 3 childs, 2.5% bonus per child for 3rd to 6th
    *    child. If the worker isn't "Worker of The Month" - no bonus.
    *
    * 2. Experiences bonus: The worker gets bonus depends on worker's experience
    *    in years.
    *    Experiences bonus = Square root(basic salary * experience in years)
    */
    public static double getGrossSalary() {
        double GrossSalary = basicSalary;
        double salaryBonus = Math.sqrt(basicSalary*experienceInYears);

        /* Checks if the worker is "Worker of The Month" */
        if (workerOfTheMonth)
        {
               switch (numberOfChildren)
               {
                   case 0: GrossSalary += salaryBonus;

                   case 1:
                   case 2:
                   case 3:
                   {
                        for(int i = 0; i < numberOfChildren; i++)
                            GrossSalary = (GrossSalary + ((GrossSalary * 5) / 100));

                        GrossSalary += salaryBonus;
                   }

                   default:
                   {
                       for(int i = 0; i < 3; i++)
                            GrossSalary = (GrossSalary + ((GrossSalary * 5) / 100));

                       for (int i = 0; i < numberOfChildren-3; i++)
                       {
                           if (i < 7)
                               GrossSalary = (GrossSalary + ((GrossSalary * 2.5) / 100));
                       }

                       GrossSalary += salaryBonus;
                   }
               }
        }

        else
            GrossSalary += salaryBonus;

        return GrossSalary;
    }

    /* Calculates tax for basic salary */
    public static float calcTaxOfBaseSalary() {
        float tax;

        if ((basicSalary >= 0) && (basicSalary <= 4000))
            tax = (float) (basicSalary * taxForSalaryBet0To4000);

        else if ((basicSalary > 4000) && (basicSalary < 6000))
            tax = (float) (basicSalary * taxForSalaryBet4000To6000);

        else
            tax = (float) (taxForSalaryBet0To4000 + (2000 * taxForSalaryBet4000To6000) + ((basicSalary - 6000) * taxForSalaryMore6000));

        return tax;
    }


    /* Calculates tax for bounus */
    public static float calcTaxOfBonus() {
        return (float) (((getGrossSalary() - basicSalary) * 12) / 100);
    }

    /* Prints the tax */
    public static void printTax() {
        double taxbasesalary = calcTaxOfBaseSalary(); // Get tax of base salary
        double taxbonus = calcTaxOfBonus();           // Get tax of bonus

        DecimalFormat df = new DecimalFormat("#.00");

        System.out.println("Tax paid on bonus:" + df.format(taxbonus) + " nis");
        System.out.println("Tax paid on base salary: " + df.format(taxbasesalary) + " nis");
        System.out.println("Total tax: " + (df.format((taxbonus + taxbasesalary))) + " nis");
    }

    /* Prints entire information of the worker */
    public static void printPaySlip() {
        double taxbase = calcTaxOfBaseSalary(); // Get tax of base salary
        double taxbonus = calcTaxOfBonus();     // Get tax of bonus
        double GrossSalary = getGrossSalary();  // Get gross salary

        DecimalFormat df = new DecimalFormat("#.00");

        System.out.println("PAY SLIP For worker: " + workerName);
        System.out.println("Basic salary is: " + basicSalary + " nis");
        System.out.println("Tax for basic salary: " + df.format(taxbase) + " nis");
        System.out.println("Bonus salary is: " + (df.format(GrossSalary - basicSalary)) + " nis");
        System.out.println("Tax for bonus salary: " + df.format(taxbonus) + " nis");
        System.out.println("Total gross salary is: " + df.format(GrossSalary) + " nis");
        System.out.println("Total tax is: " + (df.format(taxbase + taxbonus)) + " nis");
        System.out.println("Total amount in bank: " + df.format(getNetSalary()) + " nis");
    }

    public static void main(String[] args) {
        convertDataFromArgs(args); // Get the args
        printMenu(); // Print the menu

        Scanner in = new Scanner(System.in); // Creates a scanner (for input)

        String input; // Input temp variable
        char tav; // The char variable

        /* While loop - so the program will never end until we send the exit command */
        while(true)
        {
            input = in.nextLine(); // Get the input line
            tav = input.charAt(0); // Get the first char from line

            switch(tav)
            {
                /* Information about worker command */
                case 'I':
                {
                    getData();
                    continue;
                }

                /* Print net salary command */
                case 'N':
                {
                    DecimalFormat df = new DecimalFormat("#.00");
                    System.out.println("Net salary is: " + df.format(getNetSalary()) + " nis");
                    continue;
                }

                /* Print gross salary command */
                case 'V':
                {
                    DecimalFormat df = new DecimalFormat("#.00");
                    System.out.println("Gross salary is: " + df.format(getGrossSalary()) + " nis");
                    continue;
                }

                /* Print Tax command */
                case 'T':
                {
                    printTax();
                    continue;
                }

                /* Print pay slip command */
                case 'P':
                {
                    printPaySlip();
                    continue;
                }

                /* Exit command */
                case 'E':
                {
                    System.out.println("Good Bye!");
                    System.exit(0);
                }

                /* When the command is invaild */
                default: System.out.println("Error: Invaild argument");
            }
        }
    }

}