private static Map<Long, Member> store = new HashMap<>(); 코드 이해가 안가요

Member.java

package Hello.hellospring.domain;


import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;

@Entity
public class Member {

    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

MemoryMemberRepository.java

package Hello.hellospring.repository;

import Hello.hellospring.domain.Member;

import java.util.*;

public class  MemoryMemberRepository implements MemberRepository {

    private static Map<Long, Member> store = new HashMap<>();
    private static long sequence = 0L;

    @Override
    public Member save(Member member) {
        member.setId(++sequence);
        store.put(member.getId(), member);
        return member;
    }

    @Override
    public Optional<Member> findByid(Long id) {
        return Optional.ofNullable(store.get(id));
    }

    @Override
    public Optional<Member> findByName(String name) {
        return store.values().stream()
                .filter(member -> member.getName().equals(name))
                .findAny();
    }

    @Override
    public List<Member> findAll() {
        return new ArrayList<>(store.values());
    }

    public void clearStore() {
        store.clear();
    }
}

MemoryMemberReposirory.java 코드에서
private static Map<Long, Member> store = new HashMap<>(); 부분이 이해가 가질 않습니다..

ㅠㅠ Map으로 <키 , 값>을 받으려고 하는것까진 알겠는데 왜 키는 id의 데이터타입인 Long으로 들어가는데 값은 name의 데이터타입인 String으로 들어가는것이 아닌 Member 객체로 들어가게 되는건가요..??

private static Map<Long, Member> store = new HashMap<>();