//将Person类定义为case class case class Person(name : String,age : Int) object ConstructorPattern{ def main(args:Array[String]) :Unit = { val p = new Person("nyz",27) def constructorPattern(p : Person) = p match { //构造器模式必须将Person类定义为case class,否则需要自己定义伴生对象...
//构造器模式必须将类定义为case classcaseclassPerson(name:String,age:Int)objectConstructorPattern{defmain(args:Array[String]):Unit= {valp=newPerson("摇摆少年梦",27)defconstructorPattern(p:Person)=pmatch{casePerson(name,age) =>"Person"case_ =>"Other"} } } 4 序列(Sequence)模式 序列模式指的...
不知道你怎么使用case class，不需要pattern matching的话，直接用constructor，不要用case class了；...
class ClassConstructor (var name: String, private var price: Double){ def myPrintln = println(name + "," + price) } 执行: val classConstructor = new ClassConstructor("《傲慢与偏见》", 20.5) classConstructor.myPrintln 1. 2. 3. 4. 5. 6. 7. 2)主构造器会执行类定义中的所有语句 定义...
，不知道你怎么使用case class，不需要pattern matching的话，直接用constructor，不要用case class了；...
使用Mirror对象获取case类的类型信息: 代码语言:txt 复制 val classSymbol = ru.typeOf[Person].typeSymbol.asClass val classMirror = mirror.reflectClass(classSymbol) val constructor = ru.typeOf[Person].decl(ru.termNames.CONSTRUCTOR).asMethod val constructorMirror = classMirror.reflectConstructor(const...
They may only take one non-implicit argument in their constructor. There may not be any method, member or object in scope with the same name as the implicit class. Note: This means an implicit class cannot be a case class. 隐式类与旧的隐式转换的语法(implicit def)是有细微的不同的,隐...
Class Structure Auxiliary Class Constructors Supplying Default Values for Constructor Parameters Bonus: Named parameters Basic Scala Methods 点关注不迷路 Classes 为了支持面向对象编程,Scala提供了类结构,相比于Java和C#等语言,它的语法更为简洁, 但他仍然是易用且可读的. Basic Class Constructors 创建一个简单...
(1) It increases the regularity of the language in the sense that a feature (named arguments) is applicable to more scenarios, and case class constructor calls and pattern cases are more symmetrical (2) It brings the benefits of named arguments to a widely used feature of Scala (pattern mat...
However, the whole idea of having private vals in case classes feels weird. We declare a member to be private but then we can access it through a pattern match (in 2.9.x). I think we should simply disallow private vals in case class's primary constructor. Proposed way to move forward:...