编程语言
553
object单例
public class MusicPlayerJava { public static MusicPlayerJava INSTANCE = new MusicPlayerJava(); private MusicPlayerJava(){} }
class Driver interface OnExternalDriverMountListener{ fun onMount(driver: Driver) fun onUnmount(driver: Driver) } abstract class Player object MusicPlayer: Player(), OnExternalDriverMountListener{ override fun onMount(driver: Driver) { } override fun onUnmount(driver: Driver) { } val state : Int = 0 fun play(url : String){ } fun stop(){ } }
