Template Method

Template Method

Template Method, a class behavioral pattern, provides the general steps of a method while deferring the implementation to its subclasses. Used to encapsulate algorithms, it can help reduce code duplication and maximizes the reuse of subclasses. Generally, an abstract base class is created, defining a template method of an algorithm. Later on, the subclasses can alter and implement the behavior.

Pseudo Code

abstract class AbstractRenderer
{
	// Define the order in which the graphical routines should be executed
	void render()
	{
		// First draw the graphics
		drawGraphics();
 
		// Then draw the GUI on top of the graphics
		drawGUI();	
	}
 
	void drawGraphics();
	void drawGUI();
}
 
class Renderer extends AbstractRenderer
{
	void drawGraphics()
	{
		// Draw the graphics here
	}
 
	void drawGUI()
	{
		// Draw the graphical user interface here
	}
}

Links

BTP600