不是特别懂，但感觉和RUBY当中的MIX-IN功能有几分相似，这又扯到了多重继承及JAVA当中的接口虚拟类了。。
package com.hengheng.scalaclass UseTrait {}
trait Logger {def log(msg : String) {println("log : " + msg)}
}
trait ConsoleLogger extends Logger {override def log(msg : String) {println(msg)}
}
class Test extends ConsoleLogger {def test() {log("Here is Spark!")}
}
class ConcreteLogger extends Logger {def concreteLog {log("It's me!")}
}
object UseTrait extends App {var logger = new ConcreteLoggerlogger.concreteLogvar test = new Testtest.test
}
输出：
log : It's me!
Here is Spark!
