java 选择一个类，返回该实例对象

class Flower {
    String whatsYourName() {
        return "I have many names and types.";
    }
}

class Jasmine extends Flower {
    @Override
    String whatsYourName() {
        return "Jasmine";
    }
}

class Lily extends Flower {
    @Override
    String whatsYourName() {
        return "Lily";
    }
}

class Lotus extends Flower {
    @Override
    String whatsYourName() {
        return "Lotus";
    }
}

class State {
    Flower yourNationalFlower() {
        return new Flower();
    }
}

class WestBengal extends State {
    @Override
    Jasmine yourNationalFlower() {
        return new Jasmine();
    }
}

class Karnataka extends State {
    @Override
    Lotus yourNationalFlower() {
        return new Lotus();
    }
}

class AndhraPradesh extends State {
    @Override
    Lily yourNationalFlower() {
        return new Lily();
    }
}