scala基础10-主构造器/辅助构造器/私有构造器

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//class Teacher {//  var name: String = _ //可用使用占位符//  private var age = 27//  private[this] val gender = "male"//  //  //this 为辅助构造器，又叫重载构造器//  def this(name: String) {//    this //需要调用父构造器//    this.name = name//  }//  //  def sayHello() {//    println(this.name + ":" + this.age + ":" + this.gender)//  }//}//class Teacher(val name: String, val age: Int) {class Teacher private (val name: String, val age: Int) { //加private后，主构造器只能自己使用，new时只能使用辅助构造器  println("this is th primary constructor")    var gender: String = _  println(gender)    def this(name: String, age: Int, gender: String) {    this(name, age)        this.gender = gender  }}object HelloOOP {  def main(args: Array[String]) {//    val p = new Teacher//    p.name = "Spark"//    p.sayHello    //    val p = new Teacher("Spark", 5)//    println(" : " + p.age)        val p = new Teacher("Spark", 5, "male")    println(" : " + p.age)  }}

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