TreeMap()

 MAIN.JAVA:

import java.util.*;
public class Main {

	public static void main(String[] args){
		//fill your code here
		String[] events;
		String input;
		Scanner scan = new Scanner(System.in);
		System.out.println("Enter the number of events:");
		int noOfEvent = scan.nextInt();
		scan.nextLine();
		TreeMap<Integer, Integer> map = new TreeMap<Integer, Integer>();
		System.out.println("Enter event details in CSV(Customer Name, Ticket Price, No of Seats Booked)");
		for (int i = 0; i < noOfEvent; i++) {
		input = scan.nextLine();
		events = input.split(",");
		String name = events[0];
		Integer price = Integer.parseInt(events[1]);
		Integer seatBooked = Integer.parseInt(events[2]);
		if (map.containsKey(price)) {
		Integer seat = map.get(price);
		map.put(price, (seat+seatBooked));
		} else {
		map.put(price, seatBooked);
		}
		}
		System.out.println("Ticket Price Tickets Booked");
		for(Map.Entry m:map.entrySet()) {
		System.out.printf("%-15s%s\n",m.getKey(),m.getValue());
		}
		}
		}