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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