package com.example.news.models
class user(
val username: string,
val email: string,
val gender: string
) {
// 如果需要默认构造函数，可以添加
constructor() : this("", "", "")
}和package com.example.news.models
import java.io.serializable
class news(
val title: string,
val content: string,
val publisher: string,
val publishtime: string = java.util.date().tostring()
) : serializable {
}和package com.example.news.models
data class comment(
val content: string,
val com