Java Arraylist 数据提取 [英] Java Arraylist Data extraction

问题描述

您将如何提取数据如下:

How would you extract the data as follows:

我想从这个数组列表中提取:

I want to extract from this arraylist:

[{itemname=Original, number=12}, {itemname=BBQ, number=23}, {itemname=CatchUp, number=23}]

这个数组:

{"Original":12,"BBQ":23,"CatchUp":23}

提前致谢！这是用于生成哈希图的代码:

Thanks in advance! Here's the code used to generate the hashmap:

ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();
for (int i = 0; i<7;i++) {
 HashMap<String,String> map = new HashMap<String,String>();
  map.put("itemname",chips[i]);
  map.put("number",chipentry[i]);
  list.add(map);
 }

推荐答案

看起来你想把它转换成 Json，使用 google gson http://code.google.com/p/google-gson/ 非常简单

It looks like you want to convert it to Json, using google gson http://code.google.com/p/google-gson/ its very easy

提供简单的 toJson() 和 fromJson() 方法来将 Java 对象转换为 JSON，反之亦然"

"Provide simple toJson() and fromJson() methods to convert Java objects to JSON and vice-versa"

我的意思是:

Gson gson = new Gson();
gson.toJson(map); //where map is your map object

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