That is shown in the next simple executable class (Main.java). Main.java. ... In general, I try to be very careful about a constructor calling methods as part of an instance’s instantiation.

Multi-class applications and main() A Java application is implemented by one or more classes. ... String author) constructor to call the Book(String title, int pubYear, String[] authors) constructor.

That's why most Java classes provide non-default constructors, also known as parameterized constructors. For example, we might want the calling program to tell us if the car is a stick shift or not.

Optimizing overloaded Java constructors. These overloaded constructors repeat the same basic initialization steps, and that's a code smell. If you want an overloaded Java constructor to call another ...