2015-11-03 12:00:44 -08:00

21 lines
410 B
Java

// reuse/Wind.java
// Inheritance & upcasting.
class Instrument {
public void play() {}
static void tune(Instrument i) {
// ...
i.play();
}
}
// Wind objects are instruments
// because they have the same interface:
public class Wind extends Instrument {
public static void main(String[] args) {
Wind flute = new Wind();
Instrument.tune(flute); // Upcasting
}
}
/* Output: (None) */