[Singleton Kotlin] #kotlin

Singleton.kt

  companion object {
        private var INSTANCE: Repository? = null
        val instance: Repository?
            get() {
                if (INSTANCE == null) {
                    synchronized(Repository::class.java) {
                        if (INSTANCE == null) {
                            INSTANCE =
                                Repository()
                        }
                    }
                }
                return INSTANCE
            }
    }

SingletonOption2.kt

companion object {
        val instance: BlockManager by lazy { BlockManager().init() }
 }