Template Method
The Template Method design pattern defines the skeleton of an algorithm in an operation, deferring some steps to subclasses. This pattern lets subclasses redefine certain steps of an algorithm without changing the algorithm‘s structure.
Usage 
Medium
UML class diagram
A visualization of the classes and objects participating in this pattern.
Sample code
This structural code demonstrates the Template Method which provides a skeleton calling sequence of methods. One or more steps can be deferred to subclasses which implement these steps without changing the overall calling sequence.This structural code demonstrates the Template Method which provides a skeleton calling sequence of methods. One or more steps can be deferred to subclasses which implement these steps without changing the overall calling sequence.
Output
See also