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Thread: Help with beginner mutator method

  1. #1
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    Default Help with beginner mutator method

    So basically I'm trying to change the value of something by 10, I've written this code but it doesn't appear to work. Any tips?

        public double increaseHours(int x)
        {
            return this.hoursworked + x;
        }

    And used in a test
    employee1.increaseHours(10);

    If necessary I can post the full code...


  2. #2
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    Default Re: Help with beginner mutator method

    Well I might as well
    public class Payroll 
    {
        private static double totalpayout;
        private String employeeid;
        private int hourlyrate;
        private int hoursworked;
     
        public Payroll(String id, int hrr, int hrw)
        {
            employeeid=id;
            hourlyrate=hrr;
            hoursworked=hrw;
            totalpayout=hrr * hrw;
        }
        public String getEmployeeid()
        {
            return employeeid;
        }
        public int getRate()
        {
            return hourlyrate;
        }
        public double getHoursworked()
        {
            return hoursworked;
        }
        public double getEmployeepayout()
        {
            return hourlyrate * hoursworked;
        }
        public double getFinal()
        {
            return totalpayout;
        }
        public double increaseHours(int x)
        {
            return this.hoursworked + x;
        }
    }
    import java.util.Date;
    import java.text.DateFormat;
    import java.text.NumberFormat;
     
    class TestPayroll
    {		
    public static void main(String [] arg)
    {
    Date d = new Date();
    DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM);
    NumberFormat nf = NumberFormat.getCurrencyInstance();
     
    System.out.println("\nPayroll For Week Ending " + df.format(d));
    System.out.println("-------------------------------------");
    Payroll employee1 = new Payroll("444-4444", 30, 25);
    employee1.getEmployeepayout();
    displaySalary(employee1, nf);
     
    Payroll employee2 = new Payroll("555-5555", 20, 50);
    employee2.getEmployeepayout();
    displaySalary(employee2, nf);
     
    System.out.println("\tIncrease " + employee1.getEmployeeid() + " by 10 hours");
    employee1.increaseHours(10);
    displaySalary(employee1, nf);
     
    System.out.println("Total payout amount.. " +  nf.format(employee1.getFinal() + employee2.getFinal()));
    System.out.println("------------ End of report ----------");
    }
    public static void displaySalary(Payroll e, NumberFormat nf)	
    {
    System.out.println("\tEmployee # ......" + e.getEmployeeid());
    System.out.println("\tHours Worked ......" + e.getHoursworked()+ " hours");
    System.out.println("\tHourly Rate ......" + nf.format(e.getRate())+" /hour");
    System.out.println("\tYour salary is ......" + nf.format(e.getEmployeepayout()));
    System.out.println("\t---------------------------------\n");
    }	
    }

  3. #3
    Administrator copeg's Avatar
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    Default Re: Help with beginner mutator method

    but it doesn't appear to work.
    How does it not work? Does it compile? Exceptions? Misbehave? It is best to not leave any details out (see the getting help link in my signature)

  4. #4
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    Default Re: Help with beginner mutator method

    It does not alter the value by +10, it merely displays the information without any change whatsoever

    It compiles and executes without issue

  5. #5
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    Default Re: Help with beginner mutator method

    Quote Originally Posted by Dysun View Post
    It does not alter the value by +10, it merely displays the information without any change whatsoever

    It compiles and executes without issue
    If you wish to increase the value of the variable hoursworked , then you must set its value...as is your code returns the result of increasing the value, but it does not actually set the value.
    See Assignment, Arithmetic, and Unary Operators (The Java™ Tutorials > Learning the Java Language > Language Basics)

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