使用gson反序列化反序列化对象的内部对象

import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\",\"age\":30,\"address\":{\"street\":\"123 ABC St\",\"city\":\"XYZ\",\"state\":\"PQR\"}}";
        
        Gson gson = new Gson();
        Person person = gson.fromJson(json, Person.class);
        
        System.out.println("Name: " + person.getName());
        System.out.println("Age: " + person.getAge());
        System.out.println("Address: " + person.getAddress().getStreet() + ", " + person.getAddress().getCity() + ", " + person.getAddress().getState());
    }
}

class Person {
    private String name;
    private int age;
    private Address address;
    
    // Getters and setters
    
    public Person() {
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public int getAge() {
        return age;
    }
    
    public void setAge(int age) {
        this.age = age;
    }
    
    public Address getAddress() {
        return address;
    }
    
    public void setAddress(Address address) {
        this.address = address;
    }
}

class Address {
    private String street;
    private String city;
    private String state;
    
    // Getters and setters
    
    public Address() {
    }
    
    public String getStreet() {
        return street;
    }
    
    public void setStreet(String street) {
        this.street = street;
    }
    
    public String getCity() {
        return city;
    }
    
    public void setCity(String city) {
        this.city = city;
    }
    
    public String getState() {
        return state;
    }
    
    public void setState(String state) {
        this.state = state;
    }
}