从不同的类访问 HashMap

Accessing a HashMap from a different class(从不同的类访问 HashMap)

问题描述

我的班级中有一个名为 DataStorage 的哈希图:

I have a hashmap in my class titled DataStorage:

HashMap<String, Integer> people = new HashMap<String, Integer>();

people.put("bob", 2);
people.put("susan", 5);

如何在不同的类中访问此 HashMap 中的数据?

How can I access the data in this HashMap in a different class?

推荐答案

创建你的 HashMap 作为实例变量，并提供一个方法来访问你的类 API:

Create your HashMap as an instance variable and provide a method to access it into your class API:

public class DataStorage {
    private HashMap<String, Integer> people = new HashMap<String, Integer>();

    public HashMap<String, Integer> getPeopleMap() {
         return people;
    }
}

public class AnotherClass {
      DataStorage x = new DataStorage();       

      private void someMethod() {
           HashMap<String, Integer> people = x.getPeopleMap();
           //work with your map here...
      }  
}

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