trait

scala
package level02
  object Fan {
    trait A {
      println("A")
    }

    trait BB {
      println("BB")
    }
    trait B extends BB{
      println("B")
    }
    class Class1 extends A with B {
      println("Class1")
    }

    def main(args: Array[String]): Unit = {
      new Class1()
    }


}