I am reading about
Template design pattern
Abstract Template class
Concrete classes extending the Template method
A simple example is
The template method is
public void write(byte b, int off, int len).
It calls the abstract method
public abstract void write(int b),
which must be implemented by a subclass of
In this case the invariant portion of the template is the basic error handling that is common to every
OutputStream, while the variant portion of the template is the actual writing, which is specific to each concrete implementation.
Your understanding of the pattern is correct; however, it needn't be that complex. Basically, any concrete method which calls an abstract method in the same class is a template method.