22 lines
552 B
Java
22 lines
552 B
Java
// polymorphism/music/Music.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Inheritance & upcasting
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// {java polymorphism.music.Music}
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package polymorphism.music;
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public class Music {
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public static void tune(Instrument i) {
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// ...
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i.play(Note.MIDDLE_C);
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}
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public static void main(String[] args) {
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Wind flute = new Wind();
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tune(flute); // Upcasting
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}
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}
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/* Output:
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Wind.play() MIDDLE_C
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*/
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