scala 14 trait

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class UseTrait {

}

trait Logger{
// def log (msg : String)
def log (msg : String){}
}

class ConcreteLogger extends Logger with Cloneable{

// override def log(msg : String) = println("Log: " + msg)

def concreteLog{
log("It‘s me !!!")
}
}

trait TraitLogger extends Logger{
override def log (msg : String){
println(" TraitLogger Log content is : " + msg)
}
}

trait TraitLoggered{
def loged (msg : String){
println("TraitLoggered Log content is : " + msg)
}
}

trait ConsoleLogger extends TraitLogger{
override def log(msg : String){
println("Log from Console :" +msg)
}
}

scala 14 trait

原文：http://www.cnblogs.com/trgaaaaa/p/4770618.html