学习scala笔记--17 trait 可以继承 class

 

 

trait  可以继承 class

 

scala> class MyUtil 

defined class MyUtil

 

scala> class MyUtil {  def printMessage(msg:String)=println(msg) }

defined class MyUtil

 

scala> trait Logger extends MyUtil {

     |  def log(msg:String)=printMessage("log:"+msg)

     | }

defined trait Logger

 

scala> class Person(val name:String)  extends Logger {

     | def sayHello{ 

     |    log("hi "+name)

     |    printMessage("hiiiii "+name)

     | }

     | }

defined class Person

 

scala> var p = new Person("tomcat")

p: Person = Person@722b2b27

 

scala> p.sayHello

log:hi tomcat

hiiiii tomcat