Abstract class variable help

The variable gross is still 0 after I gave it another number. Manager is a subclass of Employee and computePay is abstract. The gross in the toString method is 0. I tried to do gross = (pay/24); in the toString method of manager and it worked, but I need to put that in computePay and have it work there.

Code :

 import java.util.Scanner;
import java.io.*;  
import java.util.ArrayList; 
public abstract class Employee
{
   protected String name;
   protected double grossPay;
   protected double netPay;
   protected String job;
 
   public Employee(String person, String title)
   {
       name = person;
       job = title;
   }
   abstract public void computePay();
   public void computeTax()
   {
   }
   public String toString()
   {
       String s = "s";
       return s;
   }
 
}

Code :

public class Manager extends Employee implements Bonus
{
 
    private String title;
    private double pay;
    private double gross;
    public Manager(String name, String title, String dprtmt, double salary)
    {
         super(name, title);
         gross = 0;
         pay = salary;
 
    }
 
    public double calcBonus()
    {
        return gross*0.01;
    }
    public void computePay()
    {
        gross = (pay/24);
    }
    public String toString()
    {
 
       String s = name + " title: " + job + " Pay: "+ Double.toString(pay) + " Gross: " +Double.toString(gross);
       return s;
    }
 
 
}