Java class with no constructor?

Question

I have this class

class Customer{
    int ID;
    Time arriveTime;
    Time serviceTime;
    Time completeTime;
    int transaction;
}

Don\'t I

Answer 1

You didn't define a constructor at all, so the default constructor will be added for you. It will, however, not set any of those fields, so you'll have to go:

Customer c = new Customer();
c.ID = 34

And so on. A couple of things:

• You didn't declare an access modifier, so the classes in the same package will be able to call c.ID but others won't. You might want to declare them public
• But, it would probably be better if you created a getter and setter method instead of giving access to your fields. This way you could change the fields in the future without changing the interface