介紹

Kotlin 有內建單例，只要把class換成object就好

object Member {

    private var name: String = ""

    fun setMemberName(name: String) {
        this.name = name
    }

    fun getMemberName(): String {
        return name
    }
}

存入姓名

Member.setMemberName("AndyAWD")

讀取姓名

Log.d("TAG", "姓名: ${Member.getMemberName()}")

但是內建的單例是餓漢式

我們精英中心.jpg

用靜態內部實作

class Member {
    companion object {
        val INSTANCE = MemberHolder.memberHolder
    }

    private object MemberHolder {
        val memberHolder = Member
    }
}