Thread: 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...

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");
}	
}

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

It compiles and executes without issue