Template Pattern

A Template Pattern says that "just define the skeleton of a function in an operation, deferring some steps to its subclasses".

Benefits:

It is very common technique for reusing the code.This is only the main benefit of it.

Usage:

It is used when the common behavior among sub-classes should be moved to a single common class by avoiding the duplication.

UML for Template Pattern:

Implementation of Template Pattern:

Step 1:

Create a Game abstract class.

//This is an abstract class.
public abstract class Game {
	
	   abstract void initialize();
	   abstract void start();
	   abstract void end();
	
	   public final void play(){

	      //initialize the game
	      initialize();

	      //start game
	      start();
	      
	      //end game
	      end();
	   }
}// End of the Game abstract class.

Step 2:

Create a Chess class that will extend Game abstract class for giving the definition to its method.

//This is a class.

public class Chess extends Game {
     @Override
	   void initialize() {
	      System.out.println("Chess Game Initialized! Start playing.");
	   }
     @Override
	   void start() {
	      System.out.println("Game Started. Welcome to in the chess game!");
	   }
    @Override
	   void end() {
	      System.out.println("Game Finished!");
	   }
}// End of the Chess class.

Step 3:

Create a Soccer class that will extend Game abstract class for giving the definition to its method.

//This is a class.


public class Soccer extends Game {
	
	@Override
	   void initialize() {
	      System.out.println("Soccer Game Initialized! Start playing.");
	   }

    @Override
	   void start() {
	      System.out.println("Game Started. Welcome to in the Soccer game!");
	   }
	   
	@Override
	   void end() {
	      System.out.println("Game Finished!");
	   }
}// End of the Soccer class.

Step 4:

Create a TemplatePatternDemo class.

//This is a class.
public class TemplatePatternDemo {

public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		
	     Class c=Class.forName(args[0]);
	     Game game=(Game) c.newInstance();
	     game.play();	
	   }
}// End of the Soccer class.

Output: