如何在Java中创建关联列表？

我正在尝试让用户输入

字符串

，以在列表中搜索值。这很好，但是我还希望

字符串

有一个数值。这样我就可以得到价目表上的某些商品。我试过：

public List<String, double>

公共列表

然而，这总是给我一个错误。如何存储字符串及其对应的数值？

使用映射

Map<String, Double> someMap = new HashMap<String, Double>();

---

您是只存储

字符串

和

双精度

，还是最终需要存储关于每个对象的更多信息

例如，您正在谈论存储名称和价格。如果这是一个类似购物的程序，那么最好将每个产品的所有信息存储在一个新类中，然后将该类存储在

HashMap

中。例如

// Class for your product and all related information...
public class Product {
    String name;
    double price;
    String color;
    double weight;

    public Product(String name, double price, String color, double weight){
        this.name = name;
        this.price = price;
        this.color = color;
        this.weight = weight;
    }
}

// Now add each Product to a HashMap (in your main class)...
HashMap<String,Product> products = new HashMap<String,Product>();
products.put("Cheese", new Product("Cheese",1.10,"Yellow",0.5);
products.put("Milk", new Product("Milk",2.0,"White",1.5);

---

Map#get（k）只接受一个参数。i、 e钥匙。哦，这更好。谢谢

// Class for your product and all related information...
public class Product {
    String name;
    double price;
    String color;
    double weight;

    public Product(String name, double price, String color, double weight){
        this.name = name;
        this.price = price;
        this.color = color;
        this.weight = weight;
    }
}

// Now add each Product to a HashMap (in your main class)...
HashMap<String,Product> products = new HashMap<String,Product>();
products.put("Cheese", new Product("Cheese",1.10,"Yellow",0.5);
products.put("Milk", new Product("Milk",2.0,"White",1.5);

Product cheese = products.get("Cheese");
double price = cheese.getPrice();