diff --git a/Assignment1/src/main/java/Controller/BankController.java b/Assignment1/src/main/java/Controller/BankController.java
index e24d09f..f7d514d 100644
--- a/Assignment1/src/main/java/Controller/BankController.java
+++ b/Assignment1/src/main/java/Controller/BankController.java
@@ -1,2 +1,89 @@
-package Controller;public class BankController {
+package Controller;
+
+import Service.BankService;
+import Service.BankServiceImpl;
+
+import java.util.Scanner;
+
+import static java.lang.System.exit;
+
+public class BankController {
+    public void entranceBank(){
+        BankService bankService = new BankServiceImpl();
+        Scanner sc = new Scanner(System.in);
+        while(true){
+            System.out.println();
+            System.out.println("원하시는 업무를 입력해주세요.");
+            System.out.println("[은행가입] [예적금] [잔액조회] [전체계좌조회] [나가기]");
+            String userInput = sc.nextLine().trim();
+            MainAction action = MainAction.findByAction(userInput);
+            if (action == null) {
+                System.out.println("!!!올바른 업무를 입력해주세요!!!");
+                continue;
+            }
+            switch (action) {
+                case JOIN_BANK ->{
+                    System.out.print("이름을 입력해주세요 : ");
+                    String name = sc.nextLine();;
+                    System.out.print("주민번호 앞자리를 입력해주세요 : ");
+                    String birth = sc.nextLine();
+                    bankService.join(name, birth);
+                }
+                case SAVINGS -> {
+                    System.out.println("원하시는 업무를 입력해주세요.");
+                    System.out.println("[계좌이체] [입금] [출금]");
+                    userInput = sc.nextLine();
+                    SavingAction savingAction = SavingAction.findByAction(userInput);
+                    if (savingAction == null) {
+                        System.out.println("!!!올바른 업무를 입력해주세요!!!");
+                        continue;
+                    }
+                    switch (savingAction){
+                        case TRANSFER->{
+                            //todo: 계좌이체 서비스
+                            System.out.print("고객님의 이름을 입력해주세요: ");
+                            String name = sc.nextLine();
+                            System.out.print("고객님의 생년월일을 입력해주세요: ");
+                            String birth = sc.nextLine();
+                            if(bankService.checkMember(name, birth)){
+                                System.out.print("송금할 계좌번호를 입력하세요: ");
+                                int account = Integer.parseInt(sc.nextLine());
+                                System.out.print("송금할 금액을 입력하세요: ");
+                                int money = Integer.parseInt(sc.nextLine());
+                                bankService.transfer(name, birth, money, account);
+                            }
+                        }
+                        case DEPOSIT ->{
+                            System.out.print("입금할 계좌번호를 입력하세요: ");
+                            int account = Integer.parseInt(sc.nextLine());
+                            System.out.print("입금할 금액을 입력하세요: ");
+                            int money = Integer.parseInt(sc.nextLine());
+                            bankService.deposit(money, account);
+                        }
+                        case WITHDRAW ->{
+                            System.out.print("출금할 계좌번호를 입력하세요: ");
+                            int account = Integer.parseInt(sc.nextLine());
+                            System.out.print("출금할 금액을 입력하세요: ");
+                            int money = Integer.parseInt(sc.nextLine());
+                            bankService.withdraw(money, account);
+                        }
+                    }
+                }
+                case SHOW_ALL_ACCOUNTS -> {
+                    bankService.showAll();
+                }
+                case BALANCE -> {
+                    System.out.print("고객님의 이름을 입력해주세요: ");
+                    String name = sc.nextLine();
+                    System.out.print("고객님의 생년월일을 입력해주세요: ");
+                    String birth = sc.nextLine();
+                    bankService.showBalance(name, birth);
+                }
+                case EXIT ->{
+                    System.out.println("조심히 가십쇼.");
+                    exit(0);
+                }
+            }
+        }
+    }
 }
diff --git a/Assignment1/src/main/java/Controller/MainAction.java b/Assignment1/src/main/java/Controller/MainAction.java
index 7df1eda..f9a9042 100644
--- a/Assignment1/src/main/java/Controller/MainAction.java
+++ b/Assignment1/src/main/java/Controller/MainAction.java
@@ -4,6 +4,7 @@ public enum MainAction {
     JOIN_BANK("은행가입"),
     SAVINGS("예적금"),
     SHOW_ALL_ACCOUNTS("전체계좌조회"),
+    BALANCE("잔액조회"),
     EXIT("나가기");
 
     private final String action;
@@ -11,11 +12,9 @@ public enum MainAction {
     MainAction(String action) {
         this.action = action;
     }
-
     public String getAction() {
         return action;
     }
-
     public static MainAction findByAction(String action) {
         for (MainAction value : values()) {
             if (value.getAction().equalsIgnoreCase(action)) {
diff --git a/Assignment1/src/main/java/Controller/SavingAction.java b/Assignment1/src/main/java/Controller/SavingAction.java
index 486d5d9..010af45 100644
--- a/Assignment1/src/main/java/Controller/SavingAction.java
+++ b/Assignment1/src/main/java/Controller/SavingAction.java
@@ -1,2 +1,23 @@
-package Controller;public enum SavingAction {
+package Controller;
+
+public enum SavingAction {
+    TRANSFER("계좌이체"),
+    DEPOSIT("입금"),
+    WITHDRAW("출금");
+    private final String action;
+
+    SavingAction(String action) {
+        this.action = action;
+    }
+    public String getAction() {
+        return action;
+    }
+    public static SavingAction findByAction(String action) {
+        for (SavingAction value : values()) {
+            if (value.getAction().equalsIgnoreCase(action)) {
+                return value;
+            }
+        }
+        return null;
+    }
 }
diff --git a/Assignment1/src/main/java/Data/Member.java b/Assignment1/src/main/java/Data/Member.java
index 7f98532..69cb77f 100644
--- a/Assignment1/src/main/java/Data/Member.java
+++ b/Assignment1/src/main/java/Data/Member.java
@@ -1,2 +1,75 @@
-package Data;public class Member {
+package Data;
+
+import java.util.Date;
+
+public class Member {
+    private Long id;
+    private String name;
+    private Date enterDate;
+    private String birth;
+    private int account;
+    private int balance;
+
+    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;
+    }
+
+    public String getBirth() {
+        return birth;
+    }
+
+    public void setBirth(String birth) {
+        this.birth = birth;
+    }
+
+    public Date getEnterDate() {
+        return enterDate;
+    }
+
+    public void setEnterDate(Date enterDate) {
+        this.enterDate = enterDate;
+    }
+
+    public int getAccount() {
+        return account;
+    }
+
+    public void setAccount(int account) {
+        this.account = account;
+    }
+
+    public int getBalance() {
+        return balance;
+    }
+
+    public void setBalance(int balance) {
+        this.balance = balance;
+    }
+
+    @Override
+    public String toString() {
+        return "[고객ID] " + id  +
+                " [이름] " + name +
+                " [생년월일] " + birth +
+                " [가입날짜] " + enterDate +
+                " [계좌번호] " + account +
+                " [잔액] " + balance +"원";
+    }
+
+    public Member(String name, String birth){
+        this.name = name;
+        this.birth = birth;
+    }
 }
diff --git a/Assignment1/src/main/java/Main.java b/Assignment1/src/main/java/Main.java
index fb7039d..9b37497 100644
--- a/Assignment1/src/main/java/Main.java
+++ b/Assignment1/src/main/java/Main.java
@@ -1,2 +1,8 @@
-package PACKAGE_NAME;public class Main {
+import Controller.BankController;
+
+public class Main {
+    public static void main(String[] args) {
+        BankController bankController = new BankController();
+        bankController.entranceBank();
+    }
 }
diff --git a/Assignment1/src/main/java/Repository/BankRepository.java b/Assignment1/src/main/java/Repository/BankRepository.java
index 928ea63..e99b905 100644
--- a/Assignment1/src/main/java/Repository/BankRepository.java
+++ b/Assignment1/src/main/java/Repository/BankRepository.java
@@ -1,2 +1,17 @@
-package Repository;public interface BankRepository {
+package Repository;
+
+import Data.Member;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface BankRepository {
+    Member join(Member member);
+    List<Member> findAll();
+
+    Optional<Member> findByAccount(int account);
+    Optional<Member> findMember(String name, String birth);
+    int deposit(Member member, int money);
+
+    void withdraw(Member member, int money);
 }
diff --git a/Assignment1/src/main/java/Repository/MemoryBankRepository.java b/Assignment1/src/main/java/Repository/MemoryBankRepository.java
index df0e096..fc2c77a 100644
--- a/Assignment1/src/main/java/Repository/MemoryBankRepository.java
+++ b/Assignment1/src/main/java/Repository/MemoryBankRepository.java
@@ -1,17 +1,48 @@
+package Repository;
+
 import Data.Member;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
+import java.util.*;
 
-public class MemoryBankRepository {
-    private static HashMap<Long, Member> bank = new HashMap<>();
+public class MemoryBankRepository  implements BankRepository{
+    private static HashMap<Integer, Member> bank = new HashMap<>();
     private static Long id = 0L;
-    public void join(Member member) {
+
+    @Override
+    public Member join(Member member) {
         member.setId(id++);
-        bank.put(member.getId(), member);
+        member.setEnterDate(new Date());
+        member.setAccount((int)(Math.random()*10000000));
+        bank.put(member.getAccount(), member);
+        return member;
     }
+
     public List<Member> findAll(){
         return new ArrayList<>(bank.values());
     }
+
+    @Override
+    public Optional<Member> findByAccount(int account) {
+        return Optional.ofNullable(bank.get(account));
+    }
+
+
+    @Override
+    public Optional<Member> findMember(String name, String birth) {
+        Optional<Member> member = bank.values().stream()
+                .filter(m -> m.getName().equals(name) && m.getBirth().equals(birth))
+                .findAny();
+        return member;
+    }
+
+    @Override
+    public int deposit(Member member, int money) {
+        member.setBalance(member.getBalance()+money);
+        return member.getBalance();
+    }
+
+    @Override
+    public void withdraw(Member member, int money) {
+        member.setBalance(member.getBalance()-money);
+    }
 }
diff --git a/Assignment1/src/main/java/Service/BankService.java b/Assignment1/src/main/java/Service/BankService.java
index e1aca5e..2d9f058 100644
--- a/Assignment1/src/main/java/Service/BankService.java
+++ b/Assignment1/src/main/java/Service/BankService.java
@@ -1,2 +1,17 @@
-package Service;public interface BankService {
+package Service;
+
+import Data.Member;
+
+import java.util.List;
+
+public interface BankService {
+    void join(String name, String birth);
+    void deposit(int money, int account);
+    void withdraw(int money, int account);
+    void showAll();
+    void showBalance(String name, String birth);
+
+    boolean checkMember(String name, String birth);
+
+    void transfer(String name, String birth, int money, int account);
 }
diff --git a/Assignment1/src/main/java/Service/BankServiceImpl.java b/Assignment1/src/main/java/Service/BankServiceImpl.java
index cad0725..27e9d95 100644
--- a/Assignment1/src/main/java/Service/BankServiceImpl.java
+++ b/Assignment1/src/main/java/Service/BankServiceImpl.java
@@ -1,2 +1,100 @@
-package Service;public class BankServiceImpl {
+package Service;
+
+import Data.Member;
+import Repository.MemoryBankRepository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.TreeMap;
+
+public class BankServiceImpl implements BankService{
+    MemoryBankRepository memoryBankRepository = new MemoryBankRepository();
+    @Override
+    public void join(String name, String birth) {
+        Member member = new Member(name, birth.trim());
+        Optional<Member> already = memoryBankRepository.findMember(name, birth);
+        if (already.isEmpty()) {
+            memoryBankRepository.join(member);
+            System.out.println("성공적으로 가입되었습니다!");
+            System.out.println("가입정보: "+ member);
+        }
+        else{
+            System.out.println("이미 가입되어 있는 고객입니다.");
+        }
+    }
+
+    @Override
+    public void deposit(int money, int account){
+        Optional<Member> member = memoryBankRepository.findByAccount(account);
+        if (memoryBankRepository.findByAccount(account).isEmpty()) {
+            System.out.println("존재하지 않는 계좌번호입니다.");
+        }else {
+            int afterBalance = memoryBankRepository.deposit(member.get(), money);
+            System.out.println(afterBalance+"원이 성공적으로 입금되었습니다. 잔액: "+member.get().getBalance()+"원");
+        }
+    }
+
+    @Override
+    public void withdraw(int money, int account) {
+        Optional<Member> member = memoryBankRepository.findByAccount(account);
+        if (memoryBankRepository.findByAccount(account).isEmpty()) {
+            System.out.println("존재하지 않는 계좌번호입니다.");
+        }else {
+            if (money > member.get().getBalance()){
+                System.out.println("잔액 이상의 금액은 출금할 수 없습니다. 잔액: "+member.get().getBalance()+"원");
+            }else {
+                memoryBankRepository.withdraw(member.get(), money);
+                System.out.println(money+"원이 성공적으로 출금되었습니다. 잔액: "+member.get().getBalance()+"원");
+            }
+        }
+    }
+
+    @Override
+    public void showAll() {
+        List<Member> members = memoryBankRepository.findAll();
+        if ((long) members.size() == 0) {
+            System.out.println("아직 조회할 계좌 정보가 없습니다.");
+        }
+        for (Member member : members) {
+            System.out.println(member);
+        }
+    }
+
+    @Override
+    public void showBalance(String name, String birth) {
+        Optional<Member> member = memoryBankRepository.findMember(name, birth.trim());
+        if (member.isEmpty()) {
+            System.out.println("계좌 정보가 존재하지 않습니다.");
+        }else{
+            System.out.println(member.get().getName()+"님의 잔액은 "+member.get().getBalance()+"원 입니다.");
+        }
+    }
+
+    @Override
+    public boolean checkMember(String name, String birth) {
+        Optional<Member> member = memoryBankRepository.findMember(name, birth);
+        if (member.isEmpty()) {
+            System.out.println("고객 정보가 일치하지 않습니다.");
+            return false;
+        }else{
+            return true;
+        }
+    }
+
+    @Override
+    public void transfer(String name, String birth, int money, int account) {
+        Optional<Member> toMember = memoryBankRepository.findByAccount(account);
+        if (toMember.isEmpty()) {
+            System.out.println("존재하지 않는 계좌번호입니다.");
+        }else {
+            Optional<Member> fromMember = memoryBankRepository.findMember(name, birth);
+            if (money > fromMember.get().getBalance()){
+                System.out.println("잔액이 부족합니다. 잔액: "+fromMember.get().getBalance()+"원");
+            }else{
+                toMember.get().setBalance(toMember.get().getBalance()+money);
+                fromMember.get().setBalance(fromMember.get().getBalance()-money);
+                System.out.println("성공적으로 이체되었습니다.");
+            }
+        }
+    }
 }
diff --git a/Assignment1/src/test/java/MemberTest.java b/Assignment1/src/test/java/MemberTest.java
index 5ed4f2d..2984803 100644
--- a/Assignment1/src/test/java/MemberTest.java
+++ b/Assignment1/src/test/java/MemberTest.java
@@ -1,2 +1,17 @@
-package PACKAGE_NAME;public class MemberTest {
+import Data.Member;
+import org.junit.jupiter.api.Test;
+
+import java.util.Date;
+
+class MemberTest {
+//    @Test
+//    void 멤버빌더생성(){
+//        Member member1 = new Member.MemberBuilder()
+//                .id(1L)
+//                .name("member1")
+//                .birth("2000-10-20")
+//                .enterDate(new Date())
+//                .build();
+//        System.out.println("member1 = " + member1);
+//    }
 }
diff --git a/Assignment1/src/test/java/MemoryBankRepositoryTest.java b/Assignment1/src/test/java/MemoryBankRepositoryTest.java
index aeb199a..aa80429 100644
--- a/Assignment1/src/test/java/MemoryBankRepositoryTest.java
+++ b/Assignment1/src/test/java/MemoryBankRepositoryTest.java
@@ -1,2 +1,12 @@
-package PACKAGE_NAME;public class BankTest {
+import org.junit.jupiter.api.Test;
+
+class MemoryBankRepositoryTest {
+    @Test
+    void 고객조회(){
+
+    }
+    @Test
+    void 고객전체조회(){
+
+    }
 }