interface InputDevice { //輸入設備接口
    fun input(event: Any) //輸入的方法
}

interface USBInputDevice: InputDevice //user輸入設備接口
interface BLEInputDevice: InputDevice //藍牙輸入設備接口
interface OpticalMouse //光電鼠標接口

abstract class USBMouse(val name: String): USBInputDevice, OpticalMouse { //usb鼠標
    override fun input(event: Any) {

    }

    override fun toString(): String {
        return name
    }
}

class LogitechMouse : USBMouse("羅技鼠標") {

}

class Computer { //電腦類
    fun addUSBInputDevice(inputDevice: USBInputDevice) { //插入usb輸入設備
        println("add usb input device: $inputDevice")
    }

    fun addBLEInputDevice(inputDevice: BLEInputDevice) { //插入藍牙輸入設備
        println("add ble input device: $inputDevice")
    }

    fun addInputDevice(inputDevice: InputDevice) { //插入輸入設備
        when (inputDevice) {
            is BLEInputDevice -> {
                addBLEInputDevice(inputDevice)
            }
            is USBInputDevice -> {
                addUSBInputDevice(inputDevice)
            }
            else -> {
                throw IllegalArgumentException("輸入設備類型不支持")
            }
        }
    }
}

fun main(args: Array<String>) {
    val computer = Computer() //新建電腦
    val mouse = LogitechMouse() //新建羅技鼠標
    computer.addInputDevice(mouse) //把鼠標添加到電腦上
}

運行結果