pizza time

package methodsExercises.pr09PizzaTime;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
package methodsExercises.pr09PizzaTime;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Pr09PizaaTime {

    public static void main(String[] args) {

        try (BufferedReader reader  = new BufferedReader(new InputStreamReader(System.in));) {
            String[] inputLine = reader.readLine().split("\\s+");
            Pizza pizza = new Pizza();
            pizza.addPizza(inputLine);
            Map<Integer,StringBuilder> printList = pizza.getPizzaList();
            printList
            .entrySet()
            .stream()
            .sorted((g1,g2) -> Integer
                    .compare(g1.getKey(), g2.getKey()))
                    .forEach(group -> {
                System.out.printf("%d - %s\n",group
                        .getKey(),group
                        .getValue()
                        .substring(0,group.getValue()
                                .length()-2));
            });

            Class<?> pizzaClass = Pizza.class;
            Method[] methods = pizzaClass.getDeclaredMethods();
            List<Method> checkedMethods = Arrays.stream(methods)
                    .filter(m -> m.getReturnType().getName().contains("Map"))
                    .collect(Collectors.toList());

            if (checkedMethods.size() < 1) {
                throw new ClassFormatError();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

class Pizza {

    private Map<Integer,StringBuilder> pizzaList;

    public Pizza(){
        this.pizzaList = new LinkedHashMap<>();
    }

    public void addPizza(String ... pizza){
        String regex = "([0-9]+)(.*)";
        Pattern pattern = Pattern.compile(regex);

        for (String currPizza : pizza) {
            Matcher match = pattern.matcher(currPizza);
            while (match.find()) {
                int group = Integer.parseInt(match.group(1));
                String pizzaName = match.group(2);
                if (! pizzaList.containsKey(group)) {
                    pizzaList.put(group,new StringBuilder());
                }
                    pizzaList.get(group).append(pizzaName + ", ");
            }
        }
    }

    public Map<Integer,StringBuilder> getPizzaList() {
        return this.pizzaList;
    }


}