Scala隐式转换之隐式参数

/**
  * 隐式转换函数——隐式参数
  */
class SingPen {
def write(content: String): Unit = {
println(content)
  }
}

object ImplicitDemo3 {
// def exam(name: String, pen: SingPen): Unit = {
 //被implicit修饰的参数就是隐式参数
 def exam(name: String)(implicit pen: SingPen): Unit = {
    pen.write(name)
  }

def main(args: Array[String]): Unit = {
implicit val pen = new SingPen
exam("李四")
exam("张三")
// exam("李四", pen)
// exam("王五", pen)
 }
}