How to check the variables of an Object are Empty or NULL in JAVA?

Question

How to check variables of Objects are empty or NULL in JAVA?

Employee employee = repository.getEmployee(id).orElseGet(null);
if (employee == null) {
   employee = new Employee();
   employee.id(1);
   employee.name("Thirumal");
   employee.mobile("+91-8973-697-871");
   repository.save(employee);
}

Instead of NULL, I am trying to create an object new Employee()

Employee employee = repository.getEmployee(id).orElseGet(new Employee());
if (employee.isEmpty()) { //--------- How to do ????????
   employee = new Employee();
   employee.id(1);
   employee.name("Thirumal");
   employee.mobile("+91-8973-697-871");
   repository.save(employee);
}

How to check the member of objects are empty/NULL?

Answer 1

Just add that isEmpty method to Employee class and implement it there, or use a null object pattern instead of doing new Employee().

As to what you are actually trying to do in your code, I suggest to do it like that instead:

Employee employee = repository.getEmployee(id).orElseGet(() -> {
   Employee emp = new Employee();
   emp.id(1);
   emp.name("Thirumal");
   emp.mobile("+91-8973-697-871");
   return repository.save(emp);
});