scala(一)

1.case class XX

　　表示建类时会自动创建一个伴生对象，伴生对象默认的apply方法

case class Person(val name: String, val age: Int) {
}

//相当于自动创建
object Person{
    apply(val name: String, val age: Int){
        return new Person(name,age)
    }
}

2.implicit 隐式

　　对于函数可以定义隐式参数　　

def person(implicit name : String) = name 

implicit val p = "mobin"
person

如果定义在方法前面则为隐式视图

implicit def doubleToInt(x: Double) = x.toInt

 

 

 3.with

class A extends B with C with D with E 多继承

trait T1 { val a = 1 }
trait T2 { val b = 2 }
class SubClass extends T1 with T2
def func (x: T1 with T2) = { println("hello") }