Answer to Question #196593 in Java | JSP | JSF for rupa

Question

java inheritance programs of example music composition

Answer 1

import java.util.ArrayList;


public class Composition {
	private static int ids;
	private int id;
	private String name, artist;
	private double length;


	public Composition(String n, String a, double l) {
		name = n;
		artist = a;
		length = l;
		id = ids++;
	}


	public void getInfo() {
		System.out.println("Composition: " + name);
		System.out.println("Artist (or group): " + artist);
		System.out.println("Length: " + length + " minutes");
	}
	
	public static void main(String args[]) {
		ArrayList<Composition> melodies = new ArrayList<>();
		melodies.add(new Composition("Angels", "Morandi", 3.8));
		melodies.add(new Composition("Porcelain", "Moby", 4));
		melodies.add(new GenreComposition("Flash in the night", "Secret Service", "disco", 4.3));
		melodies.add(new GenreComposition("Toccata and Fugue in D minor", "Johann Sebastian Bach", "classic", 8.5));
		melodies.add(new GenreComposition("Hang on to you love", "Sade", "jazz", 4));
		melodies.add(new GenreComposition("Dream of You", "Schiller", "electronic", 4));
		melodies.add(new CountryGenreComposition("Orion", "Metallica", "metal", "USA", 8.5));
		melodies.add(new CountryGenreComposition("Emerald Sword", "Rhapsody of fire", "metal", "Italy", 5));
		melodies.add(new CountryGenreComposition("Hey You", "Pink Floyd", "rock", "Great Britain", 4.5));
		melodies.add(new CountryGenreComposition("Dresden performance", "Klaus Schulze", "electronic", "Germany", 142));
		melodies.add(new CountryGenreComposition("Blooming Day", "W Angel's Conquest", "metal", "Ukraine", 6.8));
		
		for(Composition m: melodies)
			m.getInfo();
	}
}


class GenreComposition extends Composition {
	private String genre;


	public GenreComposition(String n, String a, String g, double l) {
		super(n, a, l);
		genre = g;
	}
	
	public void getInfo() {
		super.getInfo();
		System.out.println("Genre: " + genre);
	}
}


class CountryGenreComposition extends GenreComposition {
	private String country;


	public CountryGenreComposition(String n, String a, String g, String c, double l) {
		super(n, a, g, l);
		country = c;
	}
	
	public void getInfo() {
		super.getInfo();
		System.out.println("Country: " + country);
	}
	
	
}