9. สร้างใหม่จากเก่า

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รหัสที่ 9-38 หัวคลาสแสดงการเขียนให้คลาสเป็น PowerSaving

public class GameConsole extends Toy implements PowerSaving {
  ...
}

public class Computer extends Appliance implements PowerSaving {
  ...
}

public class DVDPlayer extends MediaPlayer implements PowerSaving {
  ...
}