用java实现Beverage、Tea、Coffee、Beer类并给出简单的测试

Beverage类：

public abstract class Beverage {
    protected String description;

    public String getDescription() {
        return description;
    }

    public abstract double cost();
}

Tea类：

public class Tea extends Beverage {
    public Tea() {
        description = "Tea";
    }

    public double cost() {
        return 1.5;
    }
}

Coffee类：

public class Coffee extends Beverage {
    public Coffee() {
        description = "Coffee";
    }

    public double cost() {
        return 2.0;
    }
}

Beer类：

public class Beer extends Beverage {
    public Beer() {
        description = "Beer";
    }

    public double cost() {
        return 3.5;
    }
}

测试：

public class Test {
    public static void main(String[] args) {
        Beverage tea = new Tea();
        System.out.println(tea.getDescription() + " cost: " + tea.cost());

        Beverage coffee = new Coffee();
        System.out.println(coffee.getDescription() + " cost: " + coffee.cost());

        Beverage beer = new Beer();
        System.out.println(beer.getDescription() + " cost: " + beer.cost());
    }
}

输出：

Tea cost: 1.5
Coffee cost: 2.0
Beer cost: 3.5