四种用法

  1. 可变参数
  2. 如果参数列表中存在多个参数，那么可变参数一般放置在最后
  3. 参数默认值，一般将有默认值的参数放置在参数列表的最后

  4. 带名参数

    示例

    1. object test_stdin {
    2. def main(args: Array[String]): Unit = {
    3.  def f1(str: String*): Unit = {
    4.    println(str)
    5.  }
    7.  def f2(str1: String, str2: String*): Unit = {
    8.    println("str1:" + str1 + " " + "str2:" + str2)
    9.  }
    11.  def f3(name:String = "fyl"):Unit = {
    12.    println("My school is " + name)
    13.  }
    15.  def f4(name:String,age:Int):Unit = {
    16.    println(s"${name}的年龄是${age}")
    17.  }
    19.  f1("aa")    //WrappedArray(aa)
    20.  f1("aa","bb","cc")    //WrappedArray(aa, bb, cc)
    22.  f2("a")   //str1:a str2:WrappedArray()
    23.  f2("a","b","c")   //str1:a str2:WrappedArray(b, c)
    25.  f3()    //My school is fyl
    26.  f3("school")    //My school is school
    28.  f4("fyl",23)    //fyl的年龄是23
    29.  f4(age = 23,name = "fyl")   //fyl的年龄是23
    30. }
    31. }