In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

In other words, a Java class that supports the SOLID open-closed principle will find use in originally un-envisioned scenarios, and be flexible enough to work with newly created classes, interfaces ...

Listing 2 shows Java class StackImpl, which implements the Stack interface. Notice that the package is declared as dbc.test , which is the package identified in the dbc.properties file described ...