Why the inheritance class methods print 0 and null in Java?

I have an Employee class (including fields: empId, name, methods: getEmpId, getName, setEmpId, setName). And I create an inheritance class called HourlyEmployee from Employee. HourlyEmployee class has additional fields: rate, hours, and additional methods: setRate, setHours, monthlyPayment. I create an HourlyEmployee object called he1, when setEmpId and setName are invoked, it prints 0 and null. Can you tell me what's wrong with my code? Thanks.

public class Employee {
// instance variables
private int empId;
private String name;
// constructor
public Employee(){
}
public Employee(int empId, String name) {
this.empId = empId;
this.name = name;
}
// get methods
public int getEmpId() {
return empId;
}
public String getName() {
return name;
}
// set methods
public void setEmpId(int empId) {
this.empId = empId;
}
public void setName(String name) {
this.name = name;
}
public static class HourlyEmployee extends Employee {
private int empId;
private String name;
private double rate;
private double hours;
public HourlyEmployee() {
}
public HourlyEmployee (int empId, String name, double rate, double hours) {
this.empId = empId;
this.name = name;
this.rate = rate;
this.hours = hours;
}
public void setRate(double rate) {
this.rate = rate;
}
public void setHours(double hours) {
this.hours = hours;
}
public double monthlyPayment(){
double monthlyPayment = rate * hours;
return monthlyPayment;
}
public void employeeInfo(){
System.out.println("The employee's id is: " + empId);
System.out.println("The employee's name is: " + name);
System.out.println("The hourly rate is: " + rate);
System.out.println("The employee worked " + hours + " for a month");
}
}
public class Test {
public static void main(String[] args) {
int id;
String name;
double rate;
double hours;
double salary;
// create an hourly employee object with no-arg constructor
HourlyEmployee he1 = new HourlyEmployee ();
// set instance variables
he1.setEmpId(1);
he1.setName("Jane");
he1.setRate(15.0);
he1.setHours(50.0);
// display employee info
he1.employeeInfo();
// display monthly payment
System.out.println("Monthly payment, before change, is: " + he1.monthlyPayment());
// change the rate
he1.setRate(22.0);
// display monthly payment
System.out.println("Monthly payment, after change, is: " + he1.monthlyPayment());

The problem is:

1. HourlyEmployee does not know anything about the fields empId and name of the superclass Employee, as they are private. The fields with the same names in HourlyEmployee are actually unrelated to those, they are completely separate.
2. HourlyEmployee does not override the setters and the getters for these fields, so they still refer to the fields in the base class Employee.
3. The constructor of HourlyEmployee does not explicitly invoke a super constructor, so the default constructor is implicitly invoked.

I'd recommend to remove the default constructor from Employee if these fields should always be set explicitly. And HourlyEmployee should initialize these fields using the constructor that accepts these parameters:

public static class HourlyEmployee extends Employee {
private double rate;
private double hours;
public HourlyEmployee (int empId, String name, double rate, double hours) {
super(empId, name);
this.rate = rate;
this.hours = hours;
}
}

You should not declare this two fiels in HourlyEmployee class.

private int empId;
private String name;

When you call setEmpId and setName, you are calling Employee's method which set empId and name in Employee. But when you call employeeInfo, you are displaying empId and name in HourlyEmployee which is two totally different field from Employee's empid and name. And the 0 and null is the default value if int and String.

If you extend a class, the you shouldn't re-declare fields

You have in Employee

private int empId;
private String name; 

Do not re-declare in HourlyEmployee

Also, why are this class static ?