Milana

package OOP;

import java.util.InputMismatchException;
import java.util.Scanner;

//Creating the Parent class ("User") as the Abstract:
abstract class User {
	protected String userName;
	protected String userEmail;

	//Creating the Parameter constructors:
	public User(String U_Name, String U_Email) {
		this.userName = U_Name;
		this.userEmail = U_Email;
	}


	public User(User Obj) {
		this.userName = Obj.userName;
		this.userEmail = Obj.userEmail;
	}

	//Creating the Abstract method:
	abstract public void printDetails();
}

//Creating the Child classes:
class Artist extends User {
	private String Music_Genre;
	private int No_Of_Songs;
	protected String[][] songList;

		//This is way to Declare a scanner object :
	Scanner scanSong = new Scanner(System.in);
	private String srate;
	private int d;

	//Creating parameter constructor to set artist details:
	public Artist(String userName, String userEmail, String musicGenre, int noOfSongs) {
		//Calling parameter constructor of parent class("User")
		super(userName, userEmail);
		this.Music_Genre = musicGenre;
		this.No_Of_Songs = noOfSongs;
	}
	//In here u can how is going to Set the Song Details:
	public void setSongDetails() {
		this.songList = new String[this.No_Of_Songs][2];

		for(int s = 0; s < songList.length; s++) {
			int d = 0;
			System.out.println("Enter Song :");
			songList[s][d] = scanSong.nextLine();
			String srate;
			try {
				System.out.println("Enter rate:");
				srate = scanSong.nextLine();
				Double.parseDouble(srate);
			} catch(NumberFormatException e) {
				System.out.print("Enter a number:  ");
				songList[s][d + 1] = scanSong.nextLine();
			}


		}
		System.out.println();
	}
	//Over Riding the PrintDetails Method in the Parent Class:
	public void printDetails() {
		System.out.println("Artist name is " + this.userName);
		System.out.println("Artist email is " + this.userEmail);
		System.out.println("Artist music genre is " + this.Music_Genre);
		System.out.println("Number of songs is " + this.No_Of_Songs);
		System.out.println("Song list is: ");


		for (int s = 0; s < songList.length; s++) {
			System.out.println("Enter Song:");
			songList[s][d] = scanSong.nextLine();
			try {
				System.out.println("Enter rate:");
				srate = scanSong.nextLine();
				Double.parseDouble(srate);
			} catch(NumberFormatException e) {
				System.out.print("Enter a number:  ");
				srate = scanSong.nextLine();
			} finally {
				this.songList[s][d+1] = srate;
				System.out.println("/n");
			}
		}

//Creating the child classes using calculation interface:
abstract class Operator extends User implements Calculation {
	private String empNo;
	private String jobTitle;

	//Creating parameterized constructor to set operator details:
	public Operator(String userName, String userEmail, String emp_No, String job_Title) {
		//Calling parameter constructor of parent class:
		super(userName, userEmail);
		this.empNo = emp_No;
		this.jobTitle = job_Title;
	}
	//Over Riding PrintDetails method in the Parent class:
	public void printDetails() {
		System.out.println("Operator name is " + this.userName);
		System.out.println("Oparator email is " + this.userEmail);
		System.out.println("Operator employee number is " + this.empNo);
		System.out.println("Operator designation is " + this.jobTitle);
		System.out.println("\n\n\n");
	}
	//Calculating the Revenue:
	public void calculateRevenue(Artist Art) throws NumberFormatException {
		String convert = "";
		int No_Of_Downloads = 0;
		double sum = 0;
		double average = 0;
		double revenue = 0;

		Scanner NoOfDownloads = new Scanner(System.in);

		//Checking for exceptions
		try {
			System.out.print("Enter number of downloads : ");
			No_Of_Downloads = NoOfDownloads.nextInt();
			System.out.println();
		}
		//Print the types of Exception:
		catch(InputMismatchException ex) {
			ex.printStackTrace();
			System.out.println("Input should be an integer value");
		}

		//Checking "for" exceptions:
		try {
			for(int s = 0; s < Art.songList.length; s++) {
					convert = Art.songList[s][1];
					sum = sum + Double.parseDouble(convert);
			}
		}
		//To print the type of exception:
		catch(NumberFormatException e) {
			e.printStackTrace();
			System.out.println("Unable to format as double.");
		}
		catch(ArrayIndexOutOfBoundsException e) {
			e.printStackTrace();
			System.out.println("Invalid location of array.");
		}

		//Calculate the Revenue:
		average = sum / 5.0;
		revenue = average * No_Of_Downloads;

		System.out.println("Artist : " + Art.userName);
		System.out.println("Album revenue is LKR " + revenue);
	}
}

//Create the Interface for "revenue calculation" :
interface Calculation {
	//Method to use for calculations
	public void calcRevenue(Artist Art);
}

//Create the Play_A_Song ("Main") class:
public class Play_A_Song {

	public static void main(String[] args) {
		//Create  the Artist object:
		Artist Art1 = new Artist("Pablo Albo", "pablo@gmail.com", "Pop", 5);
		//Create the Operator object:
		Operator O1 = new Operator("Simon", "simon@playasong.com", "123", "accountant");

		//Call the Artist Methods:
		Art1.setSongDetails();
		Art1.printDetails();

		//Calling operator methods
		O1.printDetails();
		O1.calcRevenue(Art1);
	}
}