class Car(var brand: String, var model: String, var year: Int) {
// 类方法（函数）
fun drive() {
println("Wrooom!")
}
val c1 = Car("Ford", "Mustang", 1969)
// 打印属性值
println(c1.brand + " " + c1.model + " " + c1.year)
// 调用方法
c1.drive()