遮样一点用都没有

``` scala object W72 { def main(args: Array[String]): Unit = { val arr1 = Array(1, 2, 3) println(arr

``` scala object W66 { def main(args: Array[String]): Unit = { val set4 = scala.collection.mutable.S

``` scala package level02 object Fan { trait A { println("A") } trait BB { println("BB") } trait B e

``` scala object W59 { def main(args: Array[String]): Unit = { import scala.math.sqrt class Point(va

``` scala object W50 { class Student() {} class Teacher() {} def main(args: Array[String]): Unit = {

``` scala object w34 { def f(n:Int): Int = { if (n == 1) 1 else if (n == 2) 1 else f(n-1) +f(n-2) }

``` scala object w34 { def f(n:Int): Int = { if (n == 1) 1 else if (n == 2) 2 else f(n-1) +f(n-2) }

``` scala object w29 { def hello(name:String="小樊", age:Int, gender:String="女" ) = { println(s"hello,

``` scala object w24 { def max(x:Int, y:Int):Int = { if(x > y) { x }else{ y } } def main(args: Array