Código para polimorfismo
//: c07:music2:Music2.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Overloading instead of upcasting.
class Note {
private int value;
private Note(int val) { value = val; }
public static final Note
MIDDLE_C = new Note(0),
C_SHARP = new Note(1),
B_FLAT = new Note(2);
} // Etc.
class Instrument {
public void play(Note n) {
System.out.println("Instrument.play()");
}
}
class Wind extends Instrument {
public void play(Note n) {
System.out.println("Wind.play()");
}
}
class Stringed extends Instrument {
public void play(Note n) {
System.out.println("Stringed.play()");
}
}
class Brass extends Instrument {
public void play(Note n) {
System.out.println("Brass.play()");
}
}
public class Music2 {
public static void tune(Wind i) {
i.play(Note.MIDDLE_C);
}
public static void tune(Stringed i) {
i.play(Note.MIDDLE_C);
}
public static void tune(Brass i) {
i.play(Note.MIDDLE_C);
}
public static void main(String[] args) {
Wind flute = new Wind();
Stringed violin = new Stringed();
Brass frenchHorn = new Brass();
tune(flute); // No upcasting
tune(violin);
tune(frenchHorn);
}
} ///:~
