从不同的类访问HashMap [英] Accessing a HashMap from a different class

问题描述

我的课堂上有一个名为DataStorage的HashMap：

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作为一个实例变量并提供一个方法将它存取到你的类API中：

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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