Scala的caseclass

package test_27

//Set的特点：唯一（元素不相同）；无序
//case class：定义一组数据
 case class Book(var bookName:String,var author:String,var price:Double){
override def equals(obj:Any):Boolean={
  val ob =obj.asInstanceOf[Book]
  ob.bookName==bookName
}
  
}
//默认的修饰符是val（不可变）
case class Student(val name:String)
object caseclass {
  def main(args: Array[String]): Unit = {
    val s1= Student("小花")

    //定义一个可变set
    val set1=scala.collection.mutable.Set[Book](
    )
    //向set中添加俩条一样的数据
    val book1=new Book("西游记","吴承恩",100)
    val book2=new Book("西游记","吴承恩",100)
    val book3=new Book("西游记","吴承恩",100)
    //book1=book2
    println(book1 == book2)

    set1+=book2
    set1+=book2
    set1+=book3

    set1.foreach(s=>{
      println(s.author)
    })
  }

}