package com.example;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class CompetitionMain {
    private static List<Competition> competList = new ArrayList<>();

    public static void main(String[] args) {
        competList.add(new CompetitionFoot(18, "footA"));
        competList.add(new CompetitionFoot(30, "footA"));
        competList.add(new CompetitionFoot(40, "footA"));
        competList.add(new CompetitionHand(18, "handA"));
        competList.add(new CompetitionHand(30, "handA"));
        competList.add(new CompetitionHand(40, "handA"));

        List<Competition> ageList = findByAge(competList, 18);
        List<Competition> nameList = findByName(ageList, "footA");
        for (Competition competition : nameList) {
            System.out.println(competition.name);
        }
    }

    public static List<Competition> findByAge(List<Competition> competitions, int age) {
        return competitions.stream().filter(competition -> competition.age == age).collect(Collectors.toList());
    }


    public static List<Competition> findByName(List<Competition> competitions, String name) {
        return competitions.stream().filter(competition -> competition.name.equals(name)).collect(Collectors.toList());
    }

}

abstract class Competition {
    public int age;
    public String name;

    public Competition(int age, String name) {
        this.age = age;
        this.name = name;
    }


}

class CompetitionFoot extends Competition {
    public CompetitionFoot(int age, String name) {
        super(age, name);
    }
    // additional fields
}

class CompetitionHand extends Competition {
    public CompetitionHand(int age, String name) {
        super(age, name);
    }
    // additional fields
}