1、匹配物件

 1 object Test4_MatchObject {
 2   def main(args: Array[String]): Unit = {
 3     val student = new Student("wl", 22)
 4 
 5     //針對物件例項的內容進行匹配
 6     val result = student match {
 7       case Student("wl", 22) => "wl 22"
 8       case _ => "exit!"
 9     }
10     println(result)
11   }
 
12 }
13 
14 //定義類
15 class Student(val name: String, val age: Int)
16 
17 //定義伴生物件
18 object Student {
19   def apply (name: String, age: Int): Student = new Student(name, age)
20   // 必須實現一個unapply方法，用來對物件屬性進行拆解
21   def unapply(student: Student): Option[(String, Int)] = {
22     if (student == null) {
23
 
       None
24     } else {
25       Some(student.name, student.age)
26     }
27   }
28 }

2、匹配樣例類，是物件匹配的簡單使用

 1 object Test5_MatchCaseClass {
 2   def main(args: Array[String]): Unit = {
 3     val student1 = new Student1("wl", 22)
 4 
 5     //針對物件例項的內容進行匹配
 6     val result = student1 match {
 
 7       case Student1("wl", 22) => "wl 22"
 8       case _ => "exit!"
 9     }
10     println(result)
11   }
12 }
13 
14 //定義樣例類, 是物件匹配的簡單使用
15 case class Student1(name: String, val age: Int)