Question

我必须从JSON文件读取两个arraylist，其中一个包含问题，第二个包含答案，但我不知道如何编写该文件。这将是一个简单的测验。谁能给我一个例子

Answer 1

也许是这样的？

{
   "questions":
   [
        "What is the capital of France?",
        "What is the answer to everything?"
   ],
   "answers":
   [
        "Paris", 
        "forty-two"
   ]
}

另一种方法是捆绑问题答案对：

[
   {
     "q": "What is the capital of France?",
     "a": "Paris" 
   },
   {
     "q": "What is the answer to everything?",
     "a": "42" 
   }
]

这取决于您的应用哪种方式更方便和自然。

Answer 2

{
 "questions":["Question1","Question2","Question3"],
 "answers":["Answer1","Answer2","Answer3"]
}

我建议你创建一个简单的类来从Object

生成Json

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JavaToJson
{
  public static void main(String[] args) throws IOException
  {

    ArrayList<String> test = new ArrayList<String>();
    test.add("Question1");
    test.add("Question2");

    try
    {
        String jsonStr = new ObjectMapper().writeValueAsString(test);
        System.out.println("test: "+jsonStr);
    }
    catch (JsonProcessingException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
  }
}

所以变量“jsonStr”将是你要找的json。

如何编写包含两个arraylists <string>的json文件

2 个答案: