如何在DataModel中使用HashMap

问题描述

我是Android的新手，我在Android项目中工作。我想实现一个数据模型，使用该模型我想使用哈希映射执行算术运算。

但我不知道如何实现它。而且我想在文本视图中打印该值。该项目就像一个计算器。

ModelActivity

创建getter和setter我不知道如何实现这个

MainActivity

使用该模型我必须执行操作，例如使用哈希映射。

这是我的模型类

  public class Model {
 
 public Map< String，String> getSmap（String string，String str）{
 return Smap; 
} 
 
 public Map< Integer，Integer> getImap（）{
返回Imap; 
} 
 
 public Map< String，Integer> getSImap（）{
返回SImap; 
} 
 
 public Map< Integer，String> getISmap（String jeeva，String s）{
 return ISmap; 
} 
 
私人地图< String，String> Smap = new HashMap<>（）; 
私人地图<整数，整数> Imap = new HashMap（）; 
 
私人地图< String，Integer> SImap = new HashMap<>（）; 
私人地图<整数，字符串> ISmap = new HashMap<>（）; 
 
 public Map< Integer，String> getISmap（String jeeva）{
 
 return ISmap; 
 
 
 
 
 $ b $ p 
 $ b 
使用这个模型我想执行像add sub。
解决方案
为了我的理解，您想知道如何填充HashMaps。所以首先你应该阅读这个文档： 
 
 
 
 代码： 
 地图< String，String> map = new HashMap<>（）; 
 
 //将东西添加到地图
 map.put（key，value）; 
 
 //从地图
获取值字符串值= map.get（key）; 
  
在这个非常通用的术语中，您可以开始做些事情:)但是您应该完全阅读文档并对Map的工作原理有深刻的理解，然后决定需要哪种类型的Map来满足您的要求。
 
I am newbie to Android and I am working in an Android project. I want to implement a data model, using that model I want to perform the arithmetic operations using the Hash Map.
But I don't know how to implement it. And also I want to print the value in Text View. The project is like an Calculator.
ModelActivity
Create the getter and setter I don't know how to implement this
MainActivity
Using that Model I have to perform the operation like getting and setting the value using the Hash map.
This is my model class
public class Model {

    public Map<String, String> getSmap(String string, String str) {
        return Smap;
    }

    public Map<Integer, Integer> getImap() {
        return Imap;
    }

    public Map<String, Integer> getSImap() {
        return SImap;
    }

    public Map<Integer, String> getISmap(String jeeva, String s) {
        return ISmap;
    }

    private Map<String, String> Smap = new HashMap<>();
    private Map<Integer, Integer> Imap = new HashMap();

    private Map<String, Integer> SImap = new HashMap<>();
    private Map<Integer, String> ISmap = new HashMap<>();

    public Map<Integer, String> getISmap(String jeeva) {

        return ISmap;
    }
}
Using that model I want to perform the operations like add sub.
 解决方案 
For my understanding you want to know how to populate HashMaps. So first of all you should read this documentation: https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html
Code:
Map<String, String> map = new HashMap<>();

// Add things to the map
map.put("key","value");

// Get values from map
String value = map.get("key");
In very generic terms with this you can start doing stuff :) but you should absolutely read the documentation and have a deep understanding regarding how a Map works and then decide which type of Map you need to fulfil your requirements.
                        
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