scala隐式转换

双刃剑，可以简化代码，但是会增加维护成本

• 实战

import java.io.File
//import ImplicitAspect._

/**
  * Created by lihaiwo on 2019/9/20.
  */
object ImplicitApp extends App{

  // 定义隐转换函数式
//  implicit def man2superman(man:Man):Superman = new Superman(man.name)
//
//  val man = new Man("pk")
//  man.fly()

//  implicit def file2richfile(file:File):RichFile = new RichFile(file)
//  val file = new File("")
//  val txt = file.read()
//  println(txt)

  // 隐式参数
  def testParam(implicit name:String): Unit ={
    println(name + "------------")
  }

//  testParam("zhang")

  implicit val name ="im name"

  testParam

}

class Man(val name:String) {
  def eat(): Unit = {
    println("eat")
  }
}

class Superman(val name:String) {
  def fly(): Unit = {
    println("fly")
  }
}

class RichFile(val file:File) {
  def read() = {
    scala.io.Source.fromFile(file.getPath).mkString
  }
}

• 隐式转换切面封装

import java.io.File

/**
  * Created by lihaiwo on 2019/9/20.
  */
object ImplicitAspect {
  implicit def man2superman(man:Man):Superman = new Superman(man.name)

  implicit def file2richfile(file:File):RichFile = new RichFile(file)
}

• 隐式类转换

/**
  * 隐式类
  */
object ImplicitClassApp extends App{

  implicit class Calculator(x:Int) {
    def add(a:Int) = a + x
  }

  println(1.add(3))

}