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qdongxu/CompetitionMain.java

Created September 21, 2023 10:42
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Revisions

  1. qdongxu created this gist Sep 21, 2023.
    61 changes: 61 additions & 0 deletions CompetitionMain.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,61 @@
    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
    }