scala抽象类的重写-第十章

1.抽象类规则代码如下

abstract class Bike {
        val a = 100
        var b = 200
        def interest():String
        def display(): Unit ={
            println("this is a bike")
        }
        def speed() // 抽象方法
        def run(): Unit ={  // 父类方法
            println("------Im Bike Run----------")
        }
}



class AiBike extends Bike {
    override val a = 1  // 只能对val类型的变量重写
    //override var b = 2  // 这样重写是错误的,因为var 定义的变量在任何位置都可以修改,没必要对其重写

    override def speed(): Unit = {
        println("the bike speed is 40km/h " + a + "_" + b)
        b = 2
        println("edit b ........")
        println("the bike speed is 40km/h " + a + "_" + b)
    }
    override val interest:String = "AAAA"  // 用字段的方式重写父类的抽象方法
    def aiBikerun(): Unit ={
        run  //调用父类方法
    }
}
object AiBike{
    def main(args: Array[String]): Unit = {
        var aiBike = new AiBike
        aiBike.display
        aiBike.speed
        aiBike.aiBikerun
    }
}

结果如下：