Strategy pattern - Example

Compress files using different algorithms or save files in different formats or draw graphic in different presentations.

interface FortuneCookies {

    public void print();

}

class Five implements FortuneCookies {

    public void print() {

        System.out.println("It is your turn to get it");

    }

}

class Two implements FortuneCookies {

    public void print() {

        System.out.println("It is never too late to start");

    }

}

class Null implements FortuneCookies {

    public void print() {

        System.out.println("You got nothing");   

    }

}

class Dice {

   public int throwIt() {

       return (int)(Math.random()*6)+1;

   }

}

// more class...

class Test { 

    static void goodFortune() {

        int luckyNum = new Dice().throwIt();

        FortuneCookies fc;

        switch (luckyNum) {

            case 2: fc = new Two();

                    break;

            case 5: fc = new Five();

                    break;

            // more

            default: fc = new Null();

        }

        fc.print();

    }

    public static void main(String[] args) {

        goodFortune();

    }

}