//: c07:Music3.java
// From Thinking in Java, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// An extensible program
import java.util.*;

class Instrument3 {
  public void play() {
    System.out.println("Instrument3.play()");
  }
  public String what() {
    return "Instrument3";
  }
  public void adjust() {}
}

class Wind3 extends Instrument3 {
  public void play() {
    System.out.println("Wind3.play()");
  }
  public String what() { return "Wind3"; }
  public void adjust() {}
}

class Percussion3 extends Instrument3 {
  public void play() {
    System.out.println("Percussion3.play()");
  }
  public String what() { return "Percussion3"; }
  public void adjust() {}
}

class Stringed3 extends Instrument3 {
  public void play() {
    System.out.println("Stringed3.play()");
  }
  public String what() { return "Stringed3"; }
  public void adjust() {}
}

class Brass3 extends Wind3 {
  public void play() {
    System.out.println("Brass3.play()");
  }
  public void adjust() {
    System.out.println("Brass3.adjust()");
  }
}

class Woodwind3 extends Wind3 {
  public void play() {
    System.out.println("Woodwind3.play()");
  }
  public String what() { return "Woodwind3"; }
}

public class Music3 {
  // Doesn't care about type, so new types
  // added to the system still work right:
  static void tune(Instrument3 i) {
    // ...
    i.play();
  }
  static void tuneAll(Instrument3[] e) {
    for(int i = 0; i < e.length; i++)
      tune(e[i]);
  }
  public static void main(String[] args) {
    Instrument3[] orchestra = new Instrument3[5];
    int i = 0;
    // Upcasting during addition to the array:
    orchestra[i++] = new Wind3();
    orchestra[i++] = new Percussion3();
    orchestra[i++] = new Stringed3();
    orchestra[i++] = new Brass3();
    orchestra[i++] = new Woodwind3();
    tuneAll(orchestra);
  }
} ///:~