I have Employee as my main class (used to get the name and call other methods). I created two inheritance class called FullTimeEmployee and PartTimeEmployee. The program is working except the getName() in my subclasses. The name the I input works in the main class but shows up as null in the subclasses. It always outputs null and I don't know what is wrong. Can you tell me what's wrong and appreciate the help to fix it?

Main Class

import java.util.Scanner;

public class Employee {
    String name;
    
    public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       Employee emp = new Employee();
       FullTimeEmployee fte = new FullTimeEmployee();
       PartTimeEmployee pte = new PartTimeEmployee();
       
       
        System.out.println("Please input your name: ");
        String Empname = input.nextLine();
        
        emp.setName(Empname);
        
        System.out.println(emp.getName());
        
        
        
        System.out.println("Press F for Full Time or P for Part Time: ");
        char pftype = input.next().charAt(0);
        
        switch (pftype) {
            case 'P','p':
                pte.PartTimeEmployee();
                break;
                
            case 'F', 'f':
                fte.FullTimeEmployee();
                break;
             
            default : 
                System.out.println("Invalid Output");
                break;
        
        }
    }
        
    public void setName(String name){
        this.name = name;
} 
    
    public String getName(){
        return name;
    }
    
    
}

Sub classes

import java.util.Scanner;

    public class FullTimeEmployee extends Employee{
    double monthlySalary;
    String name;
    
    public void FullTimeEmployee() {
        
        FullTimeEmployee fte = new FullTimeEmployee();
        
    
        
        fte.writeOutput();
        
        
         System.out.println("______________________________________");
         System.out.println("Employee name:  "  fte.getName());
         System.out.println("Monthly Salary: "  fte.getMonthlysalary());
        
    }
    
    
    
    public void writeOutput() {
    Scanner input = new Scanner(System.in);
        
    System.out.println("Please enter your monthly salary: ");
        double FEsalary = input.nextDouble();
        setMonthlySalary(FEsalary);
}
    
    public void setMonthlySalary(double monthlySalary){
        this.monthlySalary = monthlySalary;
    }
    
    public double getMonthlysalary(){
        return monthlySalary;
    }
    
   
}

import java.util.Scanner;

public class PartTimeEmployee extends Employee {
    double ratePerHour, wage;
    int hoursWorked;
    String name;
    
    public void PartTimeEmployee() {
       PartTimeEmployee pte = new PartTimeEmployee();
       String name = pte.getName();
       pte.readInput();
       System.out.println("______________________________________");
         System.out.println("Employee name:  "  pte.getName());
         System.out.println("Monthly Salary: "  pte.getWage());
       
        
    }
    
    
    public void readInput(){
        Scanner input = new Scanner(System.in);
        
        System.out.println("Please enter your rate per hour and number of hours worked seperated by a space: ");
        String[] salary = input.nextLine().split(" "); //SCAN THE INPUT OF THE USER AND STORE THEM IN AN ARRAY. SPLITS THE WHITE SPACE.
       
       try {  //TRY THE CODE AND BE TESTED FOR ERRORS BEFORE BEING EXECUTED
       ratePerHour = Double.parseDouble(salary[0]);
       hoursWorked = Integer.parseInt(salary[1]);
       setWage(ratePerHour, hoursWorked);
       } catch (Exception e) { // CATCH THE STATEMENT IF AN ERROR OCCURED ON THE CODE
           System.out.println("Invalid input");
           System.exit(0);
       }
}
    
    public void setWage(double ratePerHour, int hoursWorked){
    wage = ratePerHour * hoursWorked;
}
    public double getWage(){
        return wage;
    }
    
  
    
    
}

OUTPUT OF EITHER

Employee name:  null
Monthly Salary: 1110.0

I'm pretty new at coding and just started learning so please excuse if my code is very redundant or has errors. Appreciate the help!

CodePudding user response：

You are not setting the empName anywhere to your inherited class objects i.e. FullTimeEmployee and PartTimeEmployee.

You are setting empName to only employee object.

 emp.setName(Empname);

There are 3 different kind of objects here Employee(), PartTimeEmployee(), and FullTimeEmployee(). You are setting name only on Employee object. One way to do it is omit the re-declaration of name in your derived classes.

 String name; //delete this from your derived classes

And just use the name of your parent class. i.e.

System.out.println("Employee name:  "  getName()); // just getName() from base class
System.out.println("Monthly Salary: "  pte.getWage());

CodePudding user response：

Your derived classes have their own names, separate from the base class' name. When you assign this.name you initialize the 'local' class member and the parent class' name remains null.