java：期望使用ArrayList

发布时间：2020-12-15 04:52:18 所属栏目：Java 来源：网络整理

导读：我有一个名为Storage的类.存储包含一个名为Products的特殊对象的arraylist.每个产品都包含名称,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

我有一个名为Storage的类.存储包含一个名为Products的特殊对象的arraylist.每个产品都包含名称,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",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行收到错误消息,说明< identifier>预期.
我知道这是一个基本问题,但我似乎无法解决这个问题.任何帮助深表感谢.

解决方法

你不能只在类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.

你要这个：

class Storage{

    Product sprite = new Product("sprite",30);
    Product pepsi = new Product("pepsi",45);
    Product orange = new Product("orange",36);
    Product hershey = new Product("hershey",33);
    Product brownie = new Product("brownie",41);
    Product apple = new Product("apple",15);
    Product crackers = new Product("peanut",68);
    Product trailmix = new Product("trailmix",45);
    Product icecream = new Product("icecream",28);
    Product doughnut = new Product("doughnut",18);
    Product banana = new Product("banana",32);
    Product coffee = new Product("coffee",40);
    Product chips = new Product("chips",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);
    }
}

（编辑：李大同）

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