从ClassTag构造Scala对象(单例)

import scala.reflect.ClassTag

class MyClass[T: ClassTag] {
  def createInstance(): T = {
    val classTag = implicitly[ClassTag[T]]
    classTag.runtimeClass.newInstance().asInstanceOf[T]
  }
}

object Singleton {
  def apply[T: ClassTag]: T = {
    val myClass = new MyClass[T]
    myClass.createInstance()
  }
}

val singleton = Singleton[MyClassType]

import scala.collection.mutable.ArrayBuffer
import scala.reflect.ClassTag

class MyClass[T: ClassTag] {
  def createInstance(): T = {
    val classTag = implicitly[ClassTag[T]]
    val builder = classTag.newBuilder
    builder.result()
  }
}

object Singleton {
  def apply[T: ClassTag]: T = {
    val myClass = new MyClass[T]
    myClass.createInstance()
  }
}

val singleton = Singleton[MyClassType]