Design Patterns in Java™, Second Edition

14 Introducing Construction

WHEN YOU CREATE a Java class, you normally provide for the creation of objects of your class by supplying class constructors. Constructors are useful, though, only if clients know which class to construct and have values for the parameters that a constructor requires. Several design patterns address cases in which these conditions or other circumstances of ordinary construction do not hold. Before examining designs for cases in which ordinary construction is insufficient, it is useful to review ordinary construction in Java.

A Few Construction Challenges

Constructors are special methods. In many respects, including access modifiers, overloading, and the syntax of parameter lists, constructors are like ...