语法的省略不能造成编译器的歧义

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package
exp {

    object Main {

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

             B[String].say("hello"); //B[String]后的括号可以省略,编译器知道这不是要用类型B而是要调用B.apply[String]

             A().say("hello"); //括号省略了不知道是要用object的类型A还是A.apply()

        }

    }

    class
A

    {

        def
say(x:String) = println(x);

    }

    object A

    {

        def
apply():A = new
A;

    }

    class
B[T]

    {

        def
say(x:T) = println(x);

    }

    object B

    {

        def
apply[T]():B[T] = new
B[T];

    }

}