Gson不序列化mac地址

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.annotations.Expose;

class MyClass {
    @Expose
    private String macAddress;
    
    // 其他字段和方法...
}

public class Main {
    public static void main(String[] args) {
        MyClass obj = new MyClass();
        obj.setMacAddress("00:11:22:33:44:55");
        
        Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
        
        // 序列化
        String json = gson.toJson(obj);
        System.out.println(json);
        
        // 反序列化
        MyClass newObj = gson.fromJson(json, MyClass.class);
        System.out.println(newObj.getMacAddress());
    }
}