将带有嵌套对象的JSON映射到GSON

{
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Main St",
    "city": "New York"
  }
}

public class Address {
    private String street;
    private String city;

    // 省略构造函数和Getter/Setter方法
}

public class Person {
    private String name;
    private int age;
    private Address address;

    // 省略构造函数和Getter/Setter方法
}

import com.google.gson.Gson;

// 创建GSON对象
Gson gson = new Gson();

// 将JSON转换为Java对象
String json = "{\"name\":\"John\",\"age\":25,\"address\":{\"street\":\"123 Main St\",\"city\":\"New York\"}}";
Person person = gson.fromJson(json, Person.class);

// 将Java对象转换为JSON
Person person = new Person("John", 25, new Address("123 Main St", "New York"));
String json = gson.toJson(person);