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Arraylist是使用最频繁的一个集合，它与数组类似，不同之处在于它可以动态改变长度，不够了可以扩容。

案例：

我的思考：

首先多个菜品信息可以用Arraylist 来存储，那我们需要再创建一个菜品类Food，为了实现菜品上架等等功能，再创建一个FoodOperator类进行操作。

我的代码：

//Food.javapublic class Food {private String name;private double price;private int score;public Food() {}public Food(String name, double price, int score) {this.name = name;this.price = price;this.score = score;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public double getScore() {return score;}public void setScore(int score) {this.score = score;}
}

// FoodOperator.javapublic class FoodOperator {ArrayList<Food> list = new ArrayList<>();public void addFood(){Food food = new Food();Scanner sc = new Scanner(System.in);System.out.println("请你输入菜品名字");String name = sc.next();food.setName(name);System.out.println("请你输入菜品价格");double price = sc.nextDouble();food.setPrice(price);System.out.println("请你输入菜品评级");int score = sc.nextInt();food.setScore(score);list.add(food);}public void print(){System.out.println("-----------------");System.out.println("菜品信息");for (int i = 0; i < list.size(); i++) {Food f = list.get(i);System.out.println(f.getName());System.out.println(f.getPrice());System.out.println(f.getScore());System.out.println("-----------------");}}public void start(){Scanner sc = new Scanner(System.in);System.out.println("操作1：上架菜品");System.out.println("操作2：打印菜品");System.out.println("操作0：退出");while (true){System.out.println("请输入你要选择的操作");String commend = sc.next();switch(commend){case "0":return;case "1":addFood();break;case "2":print();break;default:System.out.println("输入无效指令，请重试");break;}}}
}

// Test.javapublic class Test {public static void main(String[] args) {FoodOperator foodOperator = new FoodOperator();foodOperator.start();}
}