如何使用从方法返回的 HashMap

Question

这里我有一个在方法中创建 HashMap 的程序

import java.util.HashMap;


class Evan {
  public HashMap<String,Double> abilities_get() {
     HashMap<String,Double> abilities = new HashMap<String,Double>();
     abilities.put("stealth", 1.5);
     abilities.put("strength", 1.2);
     abilities.put("accuracy", 1.0);
     abilities.put("intelligence", 2.0);
     return abilities;
     
 }
 }

 public class Main {
 
    public static void main(String[] args) {
       Evan evan = new Evan();
       evan.abilities_get();
       abilities.get("stealth");
}
}

由于在主要方法中找不到“abilities”，因此该程序无法运行。我该怎么做才能在主函数中使用我的 HashMap。

Answer 1

class Evan {
    public HashMap<String,Double> abilities_get() {
        HashMap<String,Double> abilities = new HashMap<String,Double>();
        abilities.put("stealth", 1.5);
        abilities.put("strength", 1.2);
        abilities.put("accuracy", 1.0);
        abilities.put("intelligence", 2.0);
        return abilities;

    }
}

class Main {

    public static void main(String[] args) {
        Evan evan = new Evan();
        evan.abilities_get();
        Double stealth = evan.abilities_get().get("stealth");
        System.out.println(stealth);
    }
}

试试看

如何使用从方法返回的 HashMap

How to use a HashMap returned from a method

java

return

class

hashmap

return-value