class Vehicle{
var speed:Int = 60
}
class Bike extends Vehicle{
var speed:Int = 100 //编译错误：variable 'speed' needs override modifier
def show(){
println(speed)
}
}
object MainObject{
def main(args:Array[String]){
var b = new Bike()
b.show()
}
}
class Vehicle2{
val speed:Int = 60
}
class Bike2 extends Vehicle2{
override val speed:Int = 100 // Override keyword
def show(){
println(speed)
}
}
object MainObject2{
def main(args:Array[String]){
var b = new Bike2()
b.show()
}
}
class Vehicle3{
var speed:Int = 60
}
class Bike3 extends Vehicle3{
override var speed:Int = 100 //编译正确，但运行失败：variable speed cannot override a mutable variable
def show(){
println(speed)
}
}
object MainObject3{
def main(args:Array[String]){
var b = new Bike3()
b.show()
}
}
class Vehicle4{
val speed:Int = 60
}
class Bike4 extends Vehicle4{
//override var speed:Int = 100 //编译失败
def show(){
println(speed)
}
}
object MainObject4{
def main(args:Array[String]){
var b = new Bike4()
b.show()
}
}
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