変換.json

{
  "name": "John",
  "age": 30,
  "address": {
    "street": "1234 Elm St",
    "city": "Somewhere",
    "zip": "12345"
  },
  "phoneNumbers": [
    {"type": "home", "number": "123-456-7890"},
    {"type": "work", "number": "098-765-4321"}
  ]
}

Main.java

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // JSON文字列の定義（ネストされた構造を含む）
        String json = "{\"name\":\"John\", \"age\":30, \"address\":{\"street\":\"1234 Elm St\", \"city\":\"Somewhere\", \"zip\":\"12345\"}, \"phoneNumbers\":[{\"type\":\"home\", \"number\":\"123-456-7890\"}, {\"type\":\"work\", \"number\":\"098-765-4321\"}]}";

        ObjectMapper mapper = new ObjectMapper();
        try {
            // JSON文字列をMapに変換
            Map<String, Object> map = mapper.readValue(json, Map.class);

            // 変換結果のMapを出力
            System.out.println("Converted Map: " + map);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}