接口和抽象类

抽象类

abstract class Person(open val age: Int){
    abstract fun work()
}
class MaNong(age: Int): Person(age){
    override val age: Int
        get() = 0
    override fun work() {
        println("我是码农，我在写代码")
    }
}
class Doctor(age: Int): Person(age){
    override fun work() {
        println("我是医生，我在给病人看病")
    }
}
fun main(args: Array<String>) {
    val person: Person = MaNong(23)
    person.work()
    println(person.age)
    val person2 : Person = Doctor(24)
    person2.work()
    println(person2.age)
}

接口代理

class Manager: Driver, Writer {
    override fun write() {
    }
    override fun drive() {
    }
}
class SeniorManager(val driver: Driver, val writer: Writer): Driver by driver, Writer by writer
class CarDriver: Driver {
    override fun drive() {
        println("开车呢")
    }
}
class PPTWriter: Writer {
    override fun write() {
        println("做PPT呢")
    }
}
interface Driver{
    fun drive()
}
interface Writer{
    fun write()
}
fun main(args: Array<String>) {
    val driver = CarDriver()
    val writer = PPTWriter()
    val seniorManager = SeniorManager(driver, writer)
    seniorManager.drive()
    seniorManager.write()
}