The apply method in Scala

  object 伴生对象名{
    
    
    def apply(参数列表) = new 类名(参数列表)
  }

Example:

• Define a Person class, which contains two fields: name and age
• Define the apply method in the companion object to realize the free new operation of creating the Person object
• Create an object of this class in the main method, and print the name and age

object demo {
    
    
  object Person{
    
    
    def apply(name:String,age:Int): Person = new Person(name:String,age:Int)
  }

  def main(args: Array[String]): Unit = {
    
    
    var person=Person("张荷",20);
    println(person);
  }
}