Untitled

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.*;

// Data Classes
class AddOrder {
    public int orderId;
    public String artist;
    public double price;
    public int quantity;

    public AddOrder(int o, String a, double p, int q) {
        orderId = o;
        artist = a;
        price = p;
        quantity = q;
    }
}

class DeleteOrder {
    public int orderId;
    public String artist;

    public DeleteOrder(int o, String a) {
        orderId = o;
        artist = a;
    }
}

class DeletePriceLevel {
    public String artist;
    public double price;

    public DeletePriceLevel(String a, double p) {
        artist = a;
        price = p;
    }
}

// TODO(candidate): implementation below
class PriceLadder {
    public PriceLadder() {
        // TODO(candidate): implement
    }
  
    public void AddOrder(AddOrder order) {
        // TODO(candidate): implement
    } 
    
    public void DeleteOrder(DeleteOrder delete) {
        // TODO(candidate): implement
    } 
 
    public void DeletePriceLevel(DeletePriceLevel deletePriceLevel) {
        // TODO(candidate): implement
    } 
      
    public void GetPriceLevels(String artist, int numberOfPriceLevels) {
        // TODO(candidate): implement
    }  
}

/**
 * The Main class implements an application that reads lines from the standard input
 * and prints them to the standard output.
 */
public class Main {
  /**
   * Iterate through each line of input.
   */
  public static void main(String[] args) throws IOException {
    InputStreamReader reader = new InputStreamReader(System.in, StandardCharsets.UTF_8);
    BufferedReader in = new BufferedReader(reader);
    var priceLadder = new PriceLadder();
    String line;
    while ((line = in.readLine()) != null) {
      var tokens = line.split("\\s+");

      if (tokens[0].equals("ADD")) {
          priceLadder.AddOrder(new AddOrder(Integer.parseInt(tokens[1]), tokens[2], Integer.parseInt(tokens[3]), Integer.parseInt(tokens[4])));
      }
      else if (tokens[0].equals("DEL")) {
          priceLadder.DeleteOrder(new DeleteOrder(Integer.parseInt(tokens[1]), tokens[2]));
      }
      else if (tokens[0].equals("DEL_PRICE")) {
          priceLadder.DeletePriceLevel(new DeletePriceLevel(tokens[1], Double.parseDouble(tokens[2])));
      }
      else {
        String artist = tokens[0];
        var numberOfPriceLevels = Integer.parseInt(tokens[1]);
        priceLadder.GetPriceLevels(artist, numberOfPriceLevels);
      }
    }
  }
}