Java™ How to Program, Seventh Edition

8.5. Time Class Case Study: Overloaded Constructors

As you know, you can declare your own constructor to specify how objects of a class should be initialized. Next, we demonstrate a class with several overloaded constructors that enable objects of that class to be initialized in different ways. To overload constructors, simply provide multiple constructor declarations with different signatures. Recall from Section 6.12 that the compiler differentiates signatures by the number of parameters, the types of the parameters and the order of the parameter types in each signature.

Class Time2 with Overloaded Constructors

The default constructor for class Time1 (Fig. 8.1) initialized hour, minute and second to their default 0 values (which is midnight ...