java: 需要 ArrayList

Question

我有一个名为 Storage 的类。 Storage 包含一个名为 Products 的特殊对象的数组列表。每个商品都包含名称、价格等信息，我的代码如下:

class Storage{

 Product sprite = new Product("sprite",1.25,30);
 Product pepsi = new Product("pepsi",1.85,45);
 Product orange = new Product("orange",2.25,36);
 Product hershey = new Product("hershey",1.50,33);
 Product brownie = new Product("brownie",2.30,41);
 Product apple = new Product("apple",2.00,15);
 Product crackers = new Product("peanut",3.90,68);
 Product trailmix = new Product("trailmix",1.90,45);
 Product icecream = new Product("icecream",1.65,28);
 Product doughnut = new Product("doughnut",2.75,18);
 Product banana = new Product("banana",1.25,32);
 Product coffee = new Product("coffee",1.30,40);
 Product chips = new Product("chips",1.70,35);

 ArrayList<Product> arl = new ArrayList<Product>();

 //add initial elements to arraylist
 arl.add(sprite);
 arl.add(pepsi);
 arl.add(orange);
 arl.add(hershey);
 arl.add(brownie);
 arl.add(apple);
 arl.add(peanut);
 arl.add(trailmix);
 arl.add(icecream);
 arl.add(doughnut);
 arl.add(banana);
 arl.add(coffee);
 arl.add(chips);
}

每当我编译时，我都会在第 141-153 行收到一条错误消息，指出 <identifier> expected .我知道这是一个基本问题，但我似乎无法弄清楚。非常感谢任何帮助。

Answer 1

您不能只在类主体中调用这样的方法。您必须将方法调用放在其他方法或构造函数中。

你想要这个:

class Storage{

    Product sprite = new Product("sprite",1.25,30);
    Product pepsi = new Product("pepsi",1.85,45);
    Product orange = new Product("orange",2.25,36);
    Product hershey = new Product("hershey",1.50,33);
    Product brownie = new Product("brownie",2.30,41);
    Product apple = new Product("apple",2.00,15);
    Product crackers = new Product("peanut",3.90,68);
    Product trailmix = new Product("trailmix",1.90,45);
    Product icecream = new Product("icecream",1.65,28);
    Product doughnut = new Product("doughnut",2.75,18);
    Product banana = new Product("banana",1.25,32);
    Product coffee = new Product("coffee",1.30,40);
    Product chips = new Product("chips",1.70,35);

    ArrayList<Product> arl = new ArrayList<Product>();


    //constructor
    protected Storage(){
        //add initial elements to arraylist
        arl.add(sprite);
        arl.add(pepsi);
        arl.add(orange);
        arl.add(hershey);
        arl.add(brownie);
        arl.add(apple);
        arl.add(peanut);
        arl.add(trailmix);
        arl.add(icecream);
        arl.add(doughnut);
        arl.add(banana);
        arl.add(coffee);
        arl.add(chips);
    }
}