EventPlanner

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Arrays;

public class Main
{

    private class Event implements Comparable<Event>
    {
        public int time;
        public String event;
        public Event(int time, String event){
            this.time = time;
            this.event = event;
        }

        public String toString(){
            return time+":00 - "+event;
        }

        public int compareTo(Event e){
            if(this.time == e.time){
                return 0;
            }
            return (this.time < e.time ? -1 : 1);
        }
    }
    private class EventPlanner
    {
        ArrayList<Event> events = new ArrayList<>();

        public void addEvent(int time,String event){
            if(time > 0 && time < 25){
                Event e = new Event(time,event);
                events.add(e);
            } else {
                System.out.println("Time has to be between 0 and 25");
            }
        }

        public void removeEvent(int time){
            for(int a = 0;a < events.size();++a){
                if(events.get(a).time == time){
                    events.remove(a);
                    break;
                }
            }
        }

        public void removeEvent(String event){
            for(int a = 0;a < events.size();++a){
                if(events.get(a).event.equalsIgnoreCase(event)){
                    events.remove(a);
                }
            }
        }

        public String toString(){
            StringBuilder sb = new StringBuilder(events.size()*20);
            Event[] array = events.toArray(new Event[0]);
            Arrays.sort(array);
            for(Event e : array){
                sb.append(e+"\n");
            }
            return sb.toString();
        }

    }
    public void run(){
        System.out.println("For help, type 'help'");
        Scanner sc = new Scanner(System.in);
        EventPlanner ep = new EventPlanner();
        String input = null;
        String[] split = null;
        while(!"q".equals(input)){
            input = sc.nextLine();
            split = input.split(" ");
            System.out.println("");
            switch(split[0].toLowerCase()) {
                case "add":{
                    ep.addEvent(Integer.parseInt(split[1]),split[2]);
                    break;
                }
                case "view":{
                    System.out.println(ep);
                    break;
                }
                case "remove":{
                    if(split[1].matches("[0-2]?[0-9]")){
                        ep.removeEvent(Integer.parseInt(split[1]));
                    } else {
                        ep.removeEvent(split[1]);
                    }
                    break;
                }
                case "help":{
                    System.out.println("Command:\tUsage:\t\t\t\tDescription:\nAdd\t\tadd <hour> <description>\tAdd a new event\nremove\t\tremove <hour>\t\t\tRemoves the event\nremove\t\tremove <description>\t\tRemoves the event\nview\t\tview\t\t\t\tShows current tasks\nhelp\t\thelp\t\t\t\tPrints this screen");
                    break;
                }
            }
        }
    }
    public static void main(String[] args){
        new Main().run();
    }
}