模板

public abstract class gametemplate{
    //these below methods can be overridden based on the type of game
    public abstract void initialize();
    public abstract void startplay();
    public abstract void  endplay();

    //all the subclasses must use this same method to play the game i.e. following the same template present in this method,
    //hence it is declared as final.
    public final void play(){
        initialize();
        startplay();
        endplay();
    }
}

public class cricket extends gametemplate{


    @override
    public void initialize(){
        system.out.println("cricket has been initialized");
    }
    @override
    public void startplay(){
        system.out.println("cricket game has been started");
    }
    @override
    public void endplay(){
        system.out.println("cricket game has ended");
    }

}

public class football extends gametemplate{

    @override
    public void initialize(){
        system.out.println("football has been initialized");
    }
    @override
    public void startplay(){
        system.out.println("football game has been started");
    }
    @override
    public void endplay(){
        system.out.println("football game has ended");
    }

}

public class main{
    public static void main(string args[]){

        //create a football game object 
        gametemplate football = new football();
        football.play();// play() will strictly follow the sequence of method execution defined in the final play() method

        gametemplate cricket = new cricket();
        cricket.play();
    }
}

Football has been initialized
Football game has been started
Football game has ended
Cricket has been initialized
Cricket game has been started
Cricket game has ended