8.1向上转型

package sedion.nsg.upcasting; public enum Note { MIDDLE_C,C_SHARP,B_FLAT; }

　　

package sedion.nsg.upcasting; public class Instrument { public void play(Note n){ Syso.print("Instrument.play()"); } }

　　

package sedion.nsg.upcasting; public class Wind extends Instrument{ public void play(Note n){ Syso.print("Wind.play()"); } }

　　

package sedion.nsg.upcasting; public class Music { public static void tune (Instrument i){ i.play(Note.MIDDLE_C); } public static void main(String[] args) { Wind flute = new Wind(); tune(flute); } }

　　

转载于:https://www.cnblogs.com/Alandre/p/3511251.html

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