Jetpack Compose 教學上課講義【從零開始學 Jetpack Compose 程式設計】Kotlin 語法補充篇 - Builder Pattern 建造者模式

 

【從零開始學 Jetpack Compose 程式設計】

線上教學課程目錄: https://bit.ly/3JF4SFA
Youtube 課程播放清單：https://bit.ly/3tFjRbx
Udemy 線上課程：https://bit.ly/3MbVnhO

Builder Pattern 建造者模式

package com.example.myapplication

class Account private constructor(
    val id: String?,
    val name: String?,
    val balance: String?,
) {
    data class Builder(
        var id: String? = null,
        var name: String? = null,
        var balance: String? = null,
    ) {
        fun id(id: String) = apply { this.id = id }
        fun name(name: String) = apply { this.name = name }
        fun balance(balance: String) = apply { this.balance = balance }
        fun build() = BankAccount(id, name, balance)
    }
}

fun main() {
    val account = Account.Builder()
        .id("123456789")
        .name("HKT線上教室")
        .balance("666")
        .build()
    
    println(bankAccount.id)
    println(bankAccount.name)
    println(bankAccount.balance)
}