9. สร้างใหม่จากเก่า

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รหัสที่ 9-36  อินเทอร์เฟซ PowerSaving 
public interface PowerSaving {
  public static final int MIN = 1;
  public static final int MAX = 5;

  public abstract void sleep();
  public abstract void wakeup();
  public abstract boolean isSleeping();
}
©2009 S.Prasitjutrakul