1.不帶參數(shù)
//lazy實現(xiàn)
class Single private constructor(){
private object Holder {
val INSTANCE = Single()
}
companion object {
val instance :Single by lazy { Holder.INSTANCE }
}
}
//
class Single private constructor() {
companion object {
val instance = Single()
}
}
2.帶參數(shù)
class Single private constructor(context: Context) {
companion object {
var instance: Single? = null
fun getInstance(context: Context): Single {
if (instance == null) {
synchronized(Single::class) {
if (instance == null) {
instance = Single(context)
}
}
}
return instance!!
}
}
}
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