// examples of using MusicalInstrument family of classes
public class TestHarness {

    // create orchestra and have them play
	public static void main(String[] args) {
    
        // illegal!
        // MusicalInstrument m = new MusicalInstrument();
        // WoodWind w = new Woodwind();
        // Percussion p = new Percussion();
        
		Clarinet c = new Clarinet("E flat", "#2");
        // legal to use WoodWind variable, if pointing at subclass instance
        WoodWind w = c;
        
        // legal to use Percussion variable, if pointing at subclass instance
        Percussion p = new Timpani();
        
        // new here gets space for array, doesn't create MusicalInstrument object
        MusicalInstrument [ ] orchestra = new MusicalInstrument[10];
        orchestra[0] = c;
        
        // fill array with randomly chosen instruments
        for (int i = 1; i < orchestra.length; i++) {
            switch ((int)(Math.random() * 4)) {
                case 0: orchestra[i] = new Clarinet();
                        break;
                case 1: orchestra[i] = new Saxophone();
                        break;
                case 2: orchestra[i] = new Glockenspiel();
                        break;
                default: orchestra[i] = new Timpani();
            }
        }
        
        // display behavior for all elements in array
        for (int i = 0; i < orchestra.length; i++) {
            System.out.println("Solo from " + orchestra[i]);
            orchestra[i].prepare();
            orchestra[i].play();
        }
                    
	}
}