From 7c1cac0d5fde5357ede8017bde78a62e059f44de Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Mon, 17 Apr 2023 16:23:28 +0900
Subject: [PATCH 01/11] Java Assignment3 upload by HyunsooJung

---
 me/day05/practice/Electronic.java  | 107 ++++++++++++++++++++
 me/day05/practice/Electronics.java | 152 +++++++++++++++++++++++++++++
 me/day05/practice/User.java        | 135 +++++++++++++++++++++++++
 me/day05/practice/Users.java       | 114 ++++++++++++++++++++++
 4 files changed, 508 insertions(+)
 create mode 100644 me/day05/practice/Electronic.java
 create mode 100644 me/day05/practice/Electronics.java
 create mode 100644 me/day05/practice/User.java
 create mode 100644 me/day05/practice/Users.java

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
new file mode 100644
index 0000000..d5d33ad
--- /dev/null
+++ b/me/day05/practice/Electronic.java
@@ -0,0 +1,107 @@
+package me.day05.practice;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.util.Arrays;
+import java.util.Objects;
+
+public class Electronic {
+
+    enum CompanyName { SAMSUNG, LG, APPLE }
+    enum AuthMethod { FINGERPRINT, PIN, PATTERN, FACE }
+
+    private static int registrationNo;
+
+    private String productNo;
+    private String modelName;
+    private CompanyName companyName;
+    private String dateOfMade;
+    private AuthMethod[] authMethod;
+
+    Electronic () {
+        registrationNo++;
+        setDateOfMade();
+        setProductNo();
+    }
+
+    Electronic (String modelName, CompanyName companyName, AuthMethod[] authMethod) {
+        this();
+        this.modelName = modelName;
+        this.companyName = companyName;
+        this.authMethod = authMethod;
+    }
+
+    private void setDateOfMade(){
+        DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("yyMMdd");
+        dateOfMade = timeFormatter.format(LocalDate.now());
+    }
+
+    private void setProductNo(){
+        if (registrationNo >= 10000) setRegistrationNo();
+        productNo = dateOfMade + String.format("%4d", registrationNo).replaceAll(" ", "0");
+    }
+
+    private void setRegistrationNo(){
+        registrationNo %= 10000;
+    }
+
+    public boolean isContainAuthMethod(AuthMethod authMethod){
+        for (AuthMethod auth : this.authMethod)
+            if (authMethod.equals(auth)) return true;
+        return false;
+    }
+
+    public String getProductNo() {
+        return productNo;
+    }
+
+    public String getModelName() {
+        return modelName;
+    }
+
+    public void setModelName(String modelName) {
+        this.modelName = modelName;
+    }
+
+    public CompanyName getCompanyName() {
+        return companyName;
+    }
+
+    public void setCompanyName(CompanyName companyName) {
+        this.companyName = companyName;
+    }
+
+    public String getDateOfMade() {
+        return dateOfMade;
+    }
+
+    public AuthMethod[] getAuthMethod() {
+        return authMethod;
+    }
+
+    public void setAuthMethod(AuthMethod[] authMethod) {
+        this.authMethod = authMethod;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productNo, modelName, companyName, dateOfMade, Arrays.hashCode(authMethod));
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(productNo, ((Electronic)obj).productNo);
+    }
+
+    @Override
+    public String toString() {
+        return "Electronic { " +
+                "productNo=" + productNo +
+                ", modelName=" + modelName +
+                ", companyName= " + companyName +
+                ", dateOfMade=" + dateOfMade +
+                ", authMethod=" + Arrays.toString(authMethod) + " }";
+    }
+}
diff --git a/me/day05/practice/Electronics.java b/me/day05/practice/Electronics.java
new file mode 100644
index 0000000..efa1800
--- /dev/null
+++ b/me/day05/practice/Electronics.java
@@ -0,0 +1,152 @@
+package me.day05.practice;
+
+import me.day05.practice.Electronic.AuthMethod;
+import me.day05.practice.Electronic.CompanyName;
+
+import java.util.*;
+
+public class Electronics {
+
+    private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
+
+    private static final Electronic[] EMPTY_ELECTRONIC_LIST = {};
+
+    private static Electronic[] electronicList;
+
+    private static Electronics electronicsInstance;
+
+    private int size;
+
+    private int capacity;
+
+    Electronics(){
+        electronicList = EMPTY_ELECTRONIC_LIST;
+    }
+
+    // TODO: 1. Electronics 클래스의 객체를 싱글톤으로 생성하는 함수를 작성하시오.
+    public static Electronics getInstance() {
+        if (electronicsInstance == null) electronicsInstance = new Electronics();
+        return electronicsInstance;
+    }
+
+    // TODO: 2. 전자제품 일련번호 productNo를 통해 인자로 주어진 일련번호에 해당하는 전자제품을 반환하는 함수를 작성하시오.
+    public Optional<Electronic> findByProductNo(String productNo){
+        for (Electronic electronic : electronicList)
+            if (productNo.equals(electronic.getProductNo()))
+                return Optional.of(electronic);
+
+        return Optional.empty();
+    }
+
+    // TODO: 3. 전자제품들 중 인자로 주어진 제조 회사를 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
+    public Optional<Electronic[]> groupByCompanyName(CompanyName company){
+        Electronic[] companyNameGroup = null;
+
+        List<Electronic> temp = new ArrayList<>();
+
+        for (Electronic electronic : electronicList)
+            // 테스트용 임시 조건 ( electronic != null )
+            if (electronic != null && electronic.getCompanyName().equals(company))
+                temp.add(electronic);
+
+        if (!temp.isEmpty()) {
+            companyNameGroup = new Electronic[temp.size()];
+            for (int i = 0; i < companyNameGroup.length; i++)
+                companyNameGroup[i] = temp.get(i);
+        }
+
+        return Optional.ofNullable(companyNameGroup);
+    }
+
+    public Optional<Electronic> findByCompanyName(CompanyName company){
+        for (Electronic electronic : electronicList)
+            if (company.equals(electronic.getCompanyName()))
+                return Optional.of(electronic);
+
+        return Optional.empty();
+    }
+
+    // TODO: 4. 전자제품들 중 인자로 주어진 인증 방법을 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
+    public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
+        Electronic[] authMethodNameGroup = null;
+
+        List<Electronic> temp = new ArrayList<>();
+
+        for (Electronic electronic : electronicList)
+            // 테스트용 임시 조건 ( electronic != null )
+            if (electronic != null && electronic.isContainAuthMethod(authMethod))
+                temp.add(electronic);
+
+        if (!temp.isEmpty()) {
+            authMethodNameGroup = new Electronic[temp.size()];
+            for (int i = 0; i < authMethodNameGroup.length; i++)
+                authMethodNameGroup[i] = temp.get(i);
+        }
+
+        return Optional.ofNullable(authMethodNameGroup);
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public void setCapacity(int capacity) {
+        this.capacity = capacity;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(Arrays.hashCode(electronicList), size, capacity);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(hashCode(), ((Electronics)obj).hashCode());
+    }
+
+    @Override
+    public String toString() {
+        return "Users { " +
+                "size=" + size +
+                ", capacity=" + capacity +
+                ", electronicList= " + Arrays.toString(electronicList) + " }";
+    }
+
+    //==================================== TEST CODE ====================================//
+    public void add (Electronic electronic) {
+        if (electronicList == EMPTY_ELECTRONIC_LIST)
+            electronicList = new Electronic[DEFAULT_CAPACITY];
+        /* 배열 크기 체크하고 늘리는 로직 구현 할 것 */
+        electronicList[size++] = electronic;
+    }
+
+    public static void main(String[] args) {
+        Electronic iPhone13 = new Electronic("아이폰13", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
+        Electronic iPhone12 = new Electronic("아이폰12", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
+        Electronic galaxyS22 = new Electronic("갤럭시S22", CompanyName.SAMSUNG, new AuthMethod[]{AuthMethod.FINGERPRINT, AuthMethod.PIN, AuthMethod.PATTERN});
+
+        Electronics electronics = getInstance();
+        electronics.add(iPhone13);
+        electronics.add(iPhone12);
+        electronics.add(galaxyS22);
+
+//        System.out.println(electronics);
+
+        Optional<Electronic[]> authMethodGroupPIN = electronics.groupByAuthMethod(AuthMethod.FACE);
+        authMethodGroupPIN.ifPresent(value -> System.out.println(Arrays.toString(value)));
+
+        Optional<Electronic[]> companyNameGroupAPPLE = electronics.groupByCompanyName(CompanyName.SAMSUNG);
+        companyNameGroupAPPLE.ifPresent(value -> System.out.println(Arrays.toString(value)));
+
+    }
+}
diff --git a/me/day05/practice/User.java b/me/day05/practice/User.java
new file mode 100644
index 0000000..78ca956
--- /dev/null
+++ b/me/day05/practice/User.java
@@ -0,0 +1,135 @@
+package me.day05.practice;
+
+import java.time.LocalDate;
+import java.util.Arrays;
+import java.util.Objects;
+
+public class User {
+    private String userId;
+    private String userPassword;
+    private String userPhoneNumber;
+    private String userEmail;
+    private String userBirthDate;
+    private Electronic[] electronicDevice;
+    private LocalDate registerTime;
+
+    User() {
+
+        setRegisterTime();
+    }
+
+    User(String userId, String userPassword, String userPhoneNumber, String userEmail, String userBirthDate, Electronic[] electronicDevice) {
+        this();
+        this.userId = userId;
+        this.userPassword = userPassword;
+        this.userPhoneNumber = userPhoneNumber;
+        this.userEmail = userEmail;
+        this.userBirthDate = userBirthDate;
+        this.electronicDevice = electronicDevice;
+    }
+
+    private User(String userId, String userPassword, String userPhoneNumber, String userEmail, String userBirthDate, Electronic[] electronicDevice, LocalDate registerTime){
+        this.userId = userId;
+        this.userPassword = userPassword;
+        this.userPhoneNumber = userPhoneNumber;
+        this.userEmail = userEmail;
+        this.userBirthDate = userBirthDate;
+        this.electronicDevice = electronicDevice;
+        this.registerTime = registerTime;
+    }
+
+    private void setRegisterTime() {
+         registerTime = LocalDate.now();
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public String getUserPassword() {
+        return userPassword;
+    }
+
+    public void setUserPassword(String userPassword) {
+        this.userPassword = userPassword;
+    }
+
+    public String getUserPhoneNumber() {
+        return userPhoneNumber;
+    }
+
+    public void setUserPhoneNumber(String userPhoneNumber) {
+        this.userPhoneNumber = userPhoneNumber;
+    }
+
+    public String getUserEmail() {
+        return userEmail;
+    }
+
+    public void setUserEmail(String userEmail) {
+        this.userEmail = userEmail;
+    }
+
+    public String getUserBirthDate() {
+        return userBirthDate;
+    }
+
+    public void setUserBirthDate(String userBirthDate) {
+        this.userBirthDate = userBirthDate;
+    }
+
+    public Electronic[] getElectronicDevice() {
+        return electronicDevice;
+    }
+
+    public void setElectronicDevice(Electronic[] electronicDevice) {
+        this.electronicDevice = electronicDevice;
+    }
+
+    public LocalDate getRegisterTime() {
+        return registerTime;
+    }
+
+//        private void validatePhoneNumberFormat(String userPhoneNumber){}
+//        private String formatPhoneNumber(String userPhoneNumber){ validatePhoneNumberFormat(userPhoneNumber) }
+//
+//        private void validateUserEmailFormat(String userPhoneNumber){}
+//        private String formatUserEmail(String userPhoneNumber){ validateUserEmailFormat(String userPhoneNumber) }
+//
+//        private void validateUserBirthDateFormat(String userBirthDate){}
+//        private String formatUserBirthDate(String userBirthDate){ validateUserBirthDateFormat(String userBirthDate) }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(userId, userPassword, userEmail, userBirthDate, Arrays.hashCode(electronicDevice), registerTime);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(hashCode(), ((User)obj).hashCode());
+    }
+
+    @Override
+    public String toString() {
+        return "User { " +
+                "userId=" + userId +
+                ", userPassword=" + userPassword +
+                ", userPhoneNumber= " + userPhoneNumber +
+                ", userEmail=" + userEmail +
+                ", userBirthDate=" + userBirthDate +
+                ", electronicDevice=" + Arrays.toString(electronicDevice) +
+                ", registerTime=" + registerTime + " }";
+    }
+
+    @Override
+    protected User clone() {
+        return new User(userId, userPassword, userPhoneNumber, userEmail, userBirthDate, electronicDevice, registerTime);
+    }
+}
+
diff --git a/me/day05/practice/Users.java b/me/day05/practice/Users.java
new file mode 100644
index 0000000..465202f
--- /dev/null
+++ b/me/day05/practice/Users.java
@@ -0,0 +1,114 @@
+package me.day05.practice;
+
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.Optional;
+
+public class Users {
+
+    private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
+
+    private static final User[] EMPTY_USER_LIST = {};
+
+    private static User[] userList;
+
+    private static Users usersInstance;
+
+    private int size;
+
+    private int capacity;
+
+    Users(){
+        userList = EMPTY_USER_LIST;
+    }
+
+    // TODO: 1. Users 클래스의 객체를 싱글톤으로 생성하는 함수를 작성하시오.
+    public static Users getInstance() {
+        if (usersInstance == null) usersInstance = new Users();
+        return usersInstance;
+    }
+
+    // TODO: 2. 회원 아이디 userId를 통해 인자로 주어진 회원번호에 해당하는 회원을 반환하는 함수를 작성하시오.
+    public Optional<User> findById(String userId){
+        for (User user : userList)
+            if (userId.equals(user.getUserId()))
+                return Optional.of(user);
+
+        return Optional.empty();
+    }
+
+    // TODO: 3. 인자로 주어진 회원 정보를 깊은 복사 (deepCopy) 하는 함수를 작성하시오.
+    public User copy(User user) {
+        User copyUser = findById(user.getUserId()).orElseThrow(NullPointerException::new); // 예외 처리 추가 구현 필요
+        return copyUser.clone();
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public void setCapacity(int capacity) {
+        this.capacity = capacity;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(Arrays.hashCode(userList), size, capacity);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(hashCode(), ((Users)obj).hashCode());
+    }
+
+    @Override
+    public String toString() {
+        return "Users { " +
+                "size=" + size +
+                ", capacity=" + capacity +
+                ", userList= " + Arrays.toString(userList) + " }";
+    }
+
+    //==================================== TEST CODE ====================================//
+    public void add (User user) {
+        if (userList == EMPTY_USER_LIST)
+            userList = new User[DEFAULT_CAPACITY];
+        /* 배열 크기 체크하고 늘리는 로직 구현 할 것 */
+        userList[size++] = user;
+    }
+
+    public static void main(String[] args) {
+        User userA = new User("A", "aaa", "aaaa", "aaa@aaa.com", "aaa", new Electronic[]{new Electronic()});
+        User userB = new User("B", "bbb", "bbbb", "bbb@bbb.com", "bbb", new Electronic[]{new Electronic()});
+        User userC = new User("C", "ccc", "cccc", "ccc@ccc.com", "ccc", new Electronic[]{new Electronic()});
+
+        Users userList = getInstance();
+        userList.add(userA);
+        userList.add(userB);
+        userList.add(userC);
+
+        System.out.println("findByID test");
+        Optional<User> a = userList.findById("A");
+        a.ifPresent(System.out::println);
+        System.out.println();
+
+
+        System.out.println("deep copy Test");
+        User copyA = userList.copy(userA);
+        copyA.setUserId("AA");
+
+        System.out.println(userA);
+        System.out.println(copyA);
+
+    }
+}

From e99be9a20188da7b05a39677c0d21dca07e5d71b Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Mon, 17 Apr 2023 17:46:08 +0900
Subject: [PATCH 02/11] style: Modify Wrapping Lines

---
 me/day05/practice/Electronics.java | 4 ----
 me/day05/practice/User.java        | 1 +
 me/day05/practice/Users.java       | 4 ----
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/me/day05/practice/Electronics.java b/me/day05/practice/Electronics.java
index efa1800..5fb20a3 100644
--- a/me/day05/practice/Electronics.java
+++ b/me/day05/practice/Electronics.java
@@ -8,15 +8,12 @@
 public class Electronics {
 
     private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
-
     private static final Electronic[] EMPTY_ELECTRONIC_LIST = {};
 
     private static Electronic[] electronicList;
-
     private static Electronics electronicsInstance;
 
     private int size;
-
     private int capacity;
 
     Electronics(){
@@ -147,6 +144,5 @@ public static void main(String[] args) {
 
         Optional<Electronic[]> companyNameGroupAPPLE = electronics.groupByCompanyName(CompanyName.SAMSUNG);
         companyNameGroupAPPLE.ifPresent(value -> System.out.println(Arrays.toString(value)));
-
     }
 }
diff --git a/me/day05/practice/User.java b/me/day05/practice/User.java
index 78ca956..959bd93 100644
--- a/me/day05/practice/User.java
+++ b/me/day05/practice/User.java
@@ -5,6 +5,7 @@
 import java.util.Objects;
 
 public class User {
+
     private String userId;
     private String userPassword;
     private String userPhoneNumber;
diff --git a/me/day05/practice/Users.java b/me/day05/practice/Users.java
index 465202f..8cdbbc0 100644
--- a/me/day05/practice/Users.java
+++ b/me/day05/practice/Users.java
@@ -7,15 +7,12 @@
 public class Users {
 
     private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
-
     private static final User[] EMPTY_USER_LIST = {};
 
     private static User[] userList;
-
     private static Users usersInstance;
 
     private int size;
-
     private int capacity;
 
     Users(){
@@ -109,6 +106,5 @@ public static void main(String[] args) {
 
         System.out.println(userA);
         System.out.println(copyA);
-
     }
 }

From b4110f8f332ed526d5c3265fba6c3c0c85ab1db3 Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Mon, 17 Apr 2023 21:46:40 +0900
Subject: [PATCH 03/11] =?UTF-8?q?refactor:=20change=20method=20replaceAll(?=
 =?UTF-8?q?)=20to=20replace()=20=ED=9A=A8=EC=9C=A8=EC=A0=81=EC=9D=B8=20?=
 =?UTF-8?q?=EB=AC=B8=EC=A0=9C=EB=A1=9C=20=EC=82=AC=EC=9A=A9=20=EB=A9=94?=
 =?UTF-8?q?=EC=86=8C=EB=93=9C=20=EB=B3=80=EA=B2=BD=20=EA=B4=80=EB=A0=A8=20?=
 =?UTF-8?q?=EC=9E=90=EB=A3=8C:=20https://yeonyeon.tistory.com/294?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Electronic.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
index d5d33ad..2184b1c 100644
--- a/me/day05/practice/Electronic.java
+++ b/me/day05/practice/Electronic.java
@@ -38,7 +38,7 @@ private void setDateOfMade(){
 
     private void setProductNo(){
         if (registrationNo >= 10000) setRegistrationNo();
-        productNo = dateOfMade + String.format("%4d", registrationNo).replaceAll(" ", "0");
+        productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
     }
 
     private void setRegistrationNo(){

From c4d5d74e56659432cf8f92bec424c13155de99ca Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 14:26:36 +0900
Subject: [PATCH 04/11] =?UTF-8?q?refactor:=20Electonic=20=ED=81=B4?=
 =?UTF-8?q?=EB=9E=98=EC=8A=A4=20=ED=95=98=EB=93=9C=EC=BD=94=EB=94=A9=20?=
 =?UTF-8?q?=EB=B6=80=20=EB=B3=80=EC=88=98=ED=99=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Electronic.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
index 2184b1c..e954f24 100644
--- a/me/day05/practice/Electronic.java
+++ b/me/day05/practice/Electronic.java
@@ -10,6 +10,8 @@ public class Electronic {
     enum CompanyName { SAMSUNG, LG, APPLE }
     enum AuthMethod { FINGERPRINT, PIN, PATTERN, FACE }
 
+    private static final int MAX_REGISTRATION_NUMBER = 9999;
+
     private static int registrationNo;
 
     private String productNo;
@@ -37,12 +39,12 @@ private void setDateOfMade(){
     }
 
     private void setProductNo(){
-        if (registrationNo >= 10000) setRegistrationNo();
+        if (registrationNo >= MAX_REGISTRATION_NUMBER) setRegistrationNo();
         productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
     }
 
     private void setRegistrationNo(){
-        registrationNo %= 10000;
+        registrationNo = 1;
     }
 
     public boolean isContainAuthMethod(AuthMethod authMethod){

From 8335a7a37e237c180d4f1b8f582670d543ab1826 Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 14:31:43 +0900
Subject: [PATCH 05/11] =?UTF-8?q?refactor:=20Electonic=20=ED=81=B4?=
 =?UTF-8?q?=EB=9E=98=EC=8A=A4=20=EB=A9=94=EC=84=9C=EB=93=9C=EB=AA=85=20?=
 =?UTF-8?q?=EB=B3=80=EA=B2=BD=20setRegistrationNo=20->=20resetRegistration?=
 =?UTF-8?q?No?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Electronic.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
index e954f24..ac45932 100644
--- a/me/day05/practice/Electronic.java
+++ b/me/day05/practice/Electronic.java
@@ -39,11 +39,11 @@ private void setDateOfMade(){
     }
 
     private void setProductNo(){
-        if (registrationNo >= MAX_REGISTRATION_NUMBER) setRegistrationNo();
+        if (registrationNo >= MAX_REGISTRATION_NUMBER) resetRegistrationNo();
         productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
     }
 
-    private void setRegistrationNo(){
+    private void resetRegistrationNo(){
         registrationNo = 1;
     }
 

From 8c81625a490ce8365003e2b65b83d60c55b60dfb Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 15:09:21 +0900
Subject: [PATCH 06/11] =?UTF-8?q?refactor:=20list=EB=A5=BC=20=EB=B0=B0?=
 =?UTF-8?q?=EC=97=B4=EB=A1=9C=20=EB=B3=80=EA=B2=BD=ED=95=98=EB=8A=94=20?=
 =?UTF-8?q?=EC=9C=A0=ED=8B=B8=20=ED=81=B4=EB=9E=98=EC=8A=A4=20=EC=B6=94?=
 =?UTF-8?q?=EA=B0=80=20=EC=A0=9C=EB=84=A4=EB=A6=AD=EC=9C=BC=EB=A1=9C=20?=
 =?UTF-8?q?=EB=B2=94=EC=9A=A9=EC=84=B1=EC=9D=84=20=EC=A6=9D=EA=B0=80?=
 =?UTF-8?q?=EC=8B=9C=ED=82=A4=EB=A0=A4=20=ED=96=88=EC=A7=80=EB=A7=8C=20?=
 =?UTF-8?q?=EC=8B=A4=ED=8C=A8!,,=20ClassCastException=20=EB=B0=9C=EC=83=9D?=
 =?UTF-8?q?=20List<Electronic>=20->=20Electronic[]=20=EC=9C=BC=EB=A1=9C=20?=
 =?UTF-8?q?=EB=B3=80=EA=B2=BD=ED=95=98=EB=8A=94=20=EC=9C=A0=ED=8B=B8=20?=
 =?UTF-8?q?=ED=81=B4=EB=9E=98=EC=8A=A4=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/ArrayUtil.java           | 15 +++++++++++++++
 me/day05/practice/ElectronicArrayUtil.java | 15 +++++++++++++++
 me/day05/practice/Electronics.java         | 16 ++++------------
 3 files changed, 34 insertions(+), 12 deletions(-)
 create mode 100644 me/day05/practice/ArrayUtil.java
 create mode 100644 me/day05/practice/ElectronicArrayUtil.java

diff --git a/me/day05/practice/ArrayUtil.java b/me/day05/practice/ArrayUtil.java
new file mode 100644
index 0000000..e61a3a4
--- /dev/null
+++ b/me/day05/practice/ArrayUtil.java
@@ -0,0 +1,15 @@
+package me.day05.practice;
+
+import java.util.List;
+
+public class ArrayUtil {
+
+    static <T> T[] listToArray(List<T> list) {
+        T[] resultArray = (T[]) new Object[list.size()];
+
+        for (int i = 0; i < resultArray.length; i++)
+            resultArray[i] = list.get(i);
+
+        return resultArray;
+    }
+}
diff --git a/me/day05/practice/ElectronicArrayUtil.java b/me/day05/practice/ElectronicArrayUtil.java
new file mode 100644
index 0000000..1e0267c
--- /dev/null
+++ b/me/day05/practice/ElectronicArrayUtil.java
@@ -0,0 +1,15 @@
+package me.day05.practice;
+
+import java.util.List;
+
+public class ElectronicArrayUtil {
+
+    static Electronic[] listToArray(List<Electronic> list) {
+        Electronic[] resultArray = new Electronic[list.size()];
+
+        for (int i = 0; i < resultArray.length; i++)
+            resultArray[i] = list.get(i);
+
+        return resultArray;
+    }
+}
diff --git a/me/day05/practice/Electronics.java b/me/day05/practice/Electronics.java
index 5fb20a3..3263fc0 100644
--- a/me/day05/practice/Electronics.java
+++ b/me/day05/practice/Electronics.java
@@ -37,7 +37,6 @@ public Optional<Electronic> findByProductNo(String productNo){
 
     // TODO: 3. 전자제품들 중 인자로 주어진 제조 회사를 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
     public Optional<Electronic[]> groupByCompanyName(CompanyName company){
-        Electronic[] companyNameGroup = null;
 
         List<Electronic> temp = new ArrayList<>();
 
@@ -46,11 +45,8 @@ public Optional<Electronic[]> groupByCompanyName(CompanyName company){
             if (electronic != null && electronic.getCompanyName().equals(company))
                 temp.add(electronic);
 
-        if (!temp.isEmpty()) {
-            companyNameGroup = new Electronic[temp.size()];
-            for (int i = 0; i < companyNameGroup.length; i++)
-                companyNameGroup[i] = temp.get(i);
-        }
+        Electronic[] companyNameGroup =
+                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
 
         return Optional.ofNullable(companyNameGroup);
     }
@@ -65,7 +61,6 @@ public Optional<Electronic> findByCompanyName(CompanyName company){
 
     // TODO: 4. 전자제품들 중 인자로 주어진 인증 방법을 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
     public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
-        Electronic[] authMethodNameGroup = null;
 
         List<Electronic> temp = new ArrayList<>();
 
@@ -74,11 +69,8 @@ public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
             if (electronic != null && electronic.isContainAuthMethod(authMethod))
                 temp.add(electronic);
 
-        if (!temp.isEmpty()) {
-            authMethodNameGroup = new Electronic[temp.size()];
-            for (int i = 0; i < authMethodNameGroup.length; i++)
-                authMethodNameGroup[i] = temp.get(i);
-        }
+        Electronic[] authMethodNameGroup =
+                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
 
         return Optional.ofNullable(authMethodNameGroup);
     }

From 82a97194bf6af0072b508b5784c6fb80afed8369 Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 17:44:16 +0900
Subject: [PATCH 07/11] =?UTF-8?q?refactor:=20setProductNo()=20=EB=A9=94?=
 =?UTF-8?q?=EC=84=9C=EB=93=9C=20registrationNo=20=EC=B2=B4=ED=81=AC=20?=
 =?UTF-8?q?=EB=A1=9C=EC=A7=81=20=EB=B6=80=EB=93=B1=ED=98=B8=20=EB=B3=80?=
 =?UTF-8?q?=EA=B2=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Electronic.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
index ac45932..221b559 100644
--- a/me/day05/practice/Electronic.java
+++ b/me/day05/practice/Electronic.java
@@ -39,7 +39,7 @@ private void setDateOfMade(){
     }
 
     private void setProductNo(){
-        if (registrationNo >= MAX_REGISTRATION_NUMBER) resetRegistrationNo();
+        if (registrationNo > MAX_REGISTRATION_NUMBER) resetRegistrationNo();
         productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
     }
 

From b532bf11549bd2cb2fddfb9096445ee8213dde6c Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 20:56:03 +0900
Subject: [PATCH 08/11] =?UTF-8?q?refactor:=20=EC=BD=94=EB=93=9C=EB=A6=AC?=
 =?UTF-8?q?=EB=B7=B0=20=EB=B0=98=EC=98=81=20=EC=82=AC=EC=9A=A9=ED=95=98?=
 =?UTF-8?q?=EC=A7=80=20=EC=95=8A=EB=8A=94=20=ED=85=8C=EC=8A=A4=ED=8A=B8,?=
 =?UTF-8?q?=20main=20=EB=A9=94=EC=84=9C=EB=93=9C,=20=EC=9C=A0=ED=8B=B8=20?=
 =?UTF-8?q?=ED=81=B4=EB=9E=98=EC=8A=A4=20=EC=82=AD=EC=A0=9C=20=EC=9C=A0?=
 =?UTF-8?q?=ED=8B=B8=EC=84=B1=20=EB=A9=94=EC=84=9C=EB=93=9C=20Electronics?=
 =?UTF-8?q?=20=ED=81=B4=EB=9E=98=EC=8A=A4=EC=97=90=20=EC=A0=95=EC=9D=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/ArrayUtil.java           | 15 -------
 me/day05/practice/ElectronicArrayUtil.java | 15 -------
 me/day05/practice/Electronics.java         | 49 +++++++---------------
 3 files changed, 14 insertions(+), 65 deletions(-)
 delete mode 100644 me/day05/practice/ArrayUtil.java
 delete mode 100644 me/day05/practice/ElectronicArrayUtil.java

diff --git a/me/day05/practice/ArrayUtil.java b/me/day05/practice/ArrayUtil.java
deleted file mode 100644
index e61a3a4..0000000
--- a/me/day05/practice/ArrayUtil.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package me.day05.practice;
-
-import java.util.List;
-
-public class ArrayUtil {
-
-    static <T> T[] listToArray(List<T> list) {
-        T[] resultArray = (T[]) new Object[list.size()];
-
-        for (int i = 0; i < resultArray.length; i++)
-            resultArray[i] = list.get(i);
-
-        return resultArray;
-    }
-}
diff --git a/me/day05/practice/ElectronicArrayUtil.java b/me/day05/practice/ElectronicArrayUtil.java
deleted file mode 100644
index 1e0267c..0000000
--- a/me/day05/practice/ElectronicArrayUtil.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package me.day05.practice;
-
-import java.util.List;
-
-public class ElectronicArrayUtil {
-
-    static Electronic[] listToArray(List<Electronic> list) {
-        Electronic[] resultArray = new Electronic[list.size()];
-
-        for (int i = 0; i < resultArray.length; i++)
-            resultArray[i] = list.get(i);
-
-        return resultArray;
-    }
-}
diff --git a/me/day05/practice/Electronics.java b/me/day05/practice/Electronics.java
index 3263fc0..9effecb 100644
--- a/me/day05/practice/Electronics.java
+++ b/me/day05/practice/Electronics.java
@@ -7,7 +7,6 @@
 
 public class Electronics {
 
-    private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
     private static final Electronic[] EMPTY_ELECTRONIC_LIST = {};
 
     private static Electronic[] electronicList;
@@ -16,7 +15,7 @@ public class Electronics {
     private int size;
     private int capacity;
 
-    Electronics(){
+    private Electronics(){
         electronicList = EMPTY_ELECTRONIC_LIST;
     }
 
@@ -41,12 +40,11 @@ public Optional<Electronic[]> groupByCompanyName(CompanyName company){
         List<Electronic> temp = new ArrayList<>();
 
         for (Electronic electronic : electronicList)
-            // 테스트용 임시 조건 ( electronic != null )
-            if (electronic != null && electronic.getCompanyName().equals(company))
+            if (electronic.getCompanyName().equals(company))
                 temp.add(electronic);
 
         Electronic[] companyNameGroup =
-                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
+                temp.isEmpty() ? null : listToArray(temp);
 
         return Optional.ofNullable(companyNameGroup);
     }
@@ -65,16 +63,24 @@ public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
         List<Electronic> temp = new ArrayList<>();
 
         for (Electronic electronic : electronicList)
-            // 테스트용 임시 조건 ( electronic != null )
-            if (electronic != null && electronic.isContainAuthMethod(authMethod))
+            if (electronic.isContainAuthMethod(authMethod))
                 temp.add(electronic);
 
         Electronic[] authMethodNameGroup =
-                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
+                temp.isEmpty() ? null : listToArray(temp);
 
         return Optional.ofNullable(authMethodNameGroup);
     }
 
+    private Electronic[] listToArray(List<Electronic> list){
+        Electronic[] array = new Electronic[list.size()];
+
+        for (int i = 0; i < array.length; i++)
+            array[i] = list.get(i);
+
+        return array;
+    }
+
     public int getSize() {
         return size;
     }
@@ -110,31 +116,4 @@ public String toString() {
                 ", capacity=" + capacity +
                 ", electronicList= " + Arrays.toString(electronicList) + " }";
     }
-
-    //==================================== TEST CODE ====================================//
-    public void add (Electronic electronic) {
-        if (electronicList == EMPTY_ELECTRONIC_LIST)
-            electronicList = new Electronic[DEFAULT_CAPACITY];
-        /* 배열 크기 체크하고 늘리는 로직 구현 할 것 */
-        electronicList[size++] = electronic;
-    }
-
-    public static void main(String[] args) {
-        Electronic iPhone13 = new Electronic("아이폰13", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
-        Electronic iPhone12 = new Electronic("아이폰12", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
-        Electronic galaxyS22 = new Electronic("갤럭시S22", CompanyName.SAMSUNG, new AuthMethod[]{AuthMethod.FINGERPRINT, AuthMethod.PIN, AuthMethod.PATTERN});
-
-        Electronics electronics = getInstance();
-        electronics.add(iPhone13);
-        electronics.add(iPhone12);
-        electronics.add(galaxyS22);
-
-//        System.out.println(electronics);
-
-        Optional<Electronic[]> authMethodGroupPIN = electronics.groupByAuthMethod(AuthMethod.FACE);
-        authMethodGroupPIN.ifPresent(value -> System.out.println(Arrays.toString(value)));
-
-        Optional<Electronic[]> companyNameGroupAPPLE = electronics.groupByCompanyName(CompanyName.SAMSUNG);
-        companyNameGroupAPPLE.ifPresent(value -> System.out.println(Arrays.toString(value)));
-    }
 }

From 9b83298ca848c2e28b2d1d9ab3686e4690dd13b8 Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 21:14:29 +0900
Subject: [PATCH 09/11] =?UTF-8?q?refactor:=20=EC=BD=94=EB=93=9C=EB=A6=AC?=
 =?UTF-8?q?=EB=B7=B0=20=EB=B0=98=EC=98=81(Electronic)=20=EB=A9=94=EC=84=9C?=
 =?UTF-8?q?=EB=93=9C=20=EC=9D=B4=EB=A6=84=20=EB=B3=80=EA=B2=BD=20isContain?=
 =?UTF-8?q?AuthMethod=20->=20isContainsAuthMethod=20(=EC=B5=9C=EB=8C=80?=
 =?UTF-8?q?=ED=95=9C=20=EB=AC=B8=EB=B2=95=EC=9D=84=20=EC=A7=80=ED=82=A4?=
 =?UTF-8?q?=EB=8F=84=EB=A1=9D=20=EB=85=B8=EB=A0=A5=ED=95=98=EC=9E=90)=20re?=
 =?UTF-8?q?setRegistrationNo()=20=EB=A9=94=EC=84=9C=EB=93=9C=20=EC=82=AD?=
 =?UTF-8?q?=EC=A0=9C=20(=EA=B0=80=EB=8F=85=EC=84=B1=EA=B3=BC=20=EC=BD=94?=
 =?UTF-8?q?=EB=93=9C=20=EC=A7=91=EC=A4=91=ED=99=94=EB=A5=BC=20=EA=B3=A0?=
 =?UTF-8?q?=EB=A0=A4=ED=95=B4=EB=B3=B4=EC=9E=90)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Electronic.java  | 8 ++------
 me/day05/practice/Electronics.java | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/me/day05/practice/Electronic.java b/me/day05/practice/Electronic.java
index 221b559..54aa545 100644
--- a/me/day05/practice/Electronic.java
+++ b/me/day05/practice/Electronic.java
@@ -39,15 +39,11 @@ private void setDateOfMade(){
     }
 
     private void setProductNo(){
-        if (registrationNo > MAX_REGISTRATION_NUMBER) resetRegistrationNo();
+        if (registrationNo > MAX_REGISTRATION_NUMBER) registrationNo = 1;
         productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
     }
 
-    private void resetRegistrationNo(){
-        registrationNo = 1;
-    }
-
-    public boolean isContainAuthMethod(AuthMethod authMethod){
+    public boolean isContainsAuthMethod(AuthMethod authMethod){
         for (AuthMethod auth : this.authMethod)
             if (authMethod.equals(auth)) return true;
         return false;
diff --git a/me/day05/practice/Electronics.java b/me/day05/practice/Electronics.java
index 9effecb..22986a5 100644
--- a/me/day05/practice/Electronics.java
+++ b/me/day05/practice/Electronics.java
@@ -63,7 +63,7 @@ public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
         List<Electronic> temp = new ArrayList<>();
 
         for (Electronic electronic : electronicList)
-            if (electronic.isContainAuthMethod(authMethod))
+            if (electronic.isContainsAuthMethod(authMethod))
                 temp.add(electronic);
 
         Electronic[] authMethodNameGroup =

From 0fce5ad6d0f1e41c3caaa2dbadb4dd064c19f41c Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 21:18:19 +0900
Subject: [PATCH 10/11] =?UTF-8?q?style:=20=EC=BD=94=EB=93=9C=EB=A6=AC?=
 =?UTF-8?q?=EB=B7=B0=20=EB=B0=98=EC=98=81(User)=20=EB=B6=88=ED=95=84?=
 =?UTF-8?q?=EC=9A=94=ED=95=9C=20=EA=B0=9C=ED=96=89=20=EC=B2=98=EB=A6=AC=20?=
 =?UTF-8?q?=EC=82=AD=EC=A0=9C=20=EC=A3=BC=EC=84=9D=EC=B2=98=EB=A6=AC=20?=
 =?UTF-8?q?=EC=82=AD=EC=A0=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/User.java | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/me/day05/practice/User.java b/me/day05/practice/User.java
index 959bd93..527500e 100644
--- a/me/day05/practice/User.java
+++ b/me/day05/practice/User.java
@@ -15,7 +15,6 @@ public class User {
     private LocalDate registerTime;
 
     User() {
-
         setRegisterTime();
     }
 
@@ -95,15 +94,6 @@ public LocalDate getRegisterTime() {
         return registerTime;
     }
 
-//        private void validatePhoneNumberFormat(String userPhoneNumber){}
-//        private String formatPhoneNumber(String userPhoneNumber){ validatePhoneNumberFormat(userPhoneNumber) }
-//
-//        private void validateUserEmailFormat(String userPhoneNumber){}
-//        private String formatUserEmail(String userPhoneNumber){ validateUserEmailFormat(String userPhoneNumber) }
-//
-//        private void validateUserBirthDateFormat(String userBirthDate){}
-//        private String formatUserBirthDate(String userBirthDate){ validateUserBirthDateFormat(String userBirthDate) }
-
     @Override
     public int hashCode() {
         return Objects.hash(userId, userPassword, userEmail, userBirthDate, Arrays.hashCode(electronicDevice), registerTime);

From fbec7c07a48e7fc915b41e720c9647ba35fda275 Mon Sep 17 00:00:00 2001
From: hyunsb <96504592+hyunsb@users.noreply.github.com>
Date: Fri, 21 Apr 2023 21:20:14 +0900
Subject: [PATCH 11/11] =?UTF-8?q?style:=20=EC=BD=94=EB=93=9C=EB=A6=AC?=
 =?UTF-8?q?=EB=B7=B0=20=EB=B0=98=EC=98=81(Users)=20=EC=83=9D=EC=84=B1?=
 =?UTF-8?q?=EC=9E=90=EC=9D=98=20=EC=A0=91=EA=B7=BC=EC=A0=9C=EC=96=B4?=
 =?UTF-8?q?=EC=9E=90=20=EB=B3=80=EA=B2=BD=20(=EC=9D=B5=EC=88=99=ED=95=9C?=
 =?UTF-8?q?=20=EA=B2=83=EC=97=90=EC=84=9C=20=EC=8B=A4=EC=88=98=EA=B0=80=20?=
 =?UTF-8?q?=EB=82=98=EC=98=A8=EB=8B=A4=20=EB=8B=A4=EC=8B=9C=20=ED=95=9C=20?=
 =?UTF-8?q?=EB=B2=88=20=ED=99=95=EC=9D=B8=ED=95=98=EC=9E=90)=20=EB=B6=88?=
 =?UTF-8?q?=ED=95=84=EC=9A=94=ED=95=9C=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20?=
 =?UTF-8?q?=EC=9C=84=EC=A3=BC=20=EC=BD=94=EB=93=9C=20=EC=82=AD=EC=A0=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 me/day05/practice/Users.java | 34 +---------------------------------
 1 file changed, 1 insertion(+), 33 deletions(-)

diff --git a/me/day05/practice/Users.java b/me/day05/practice/Users.java
index 8cdbbc0..92fc998 100644
--- a/me/day05/practice/Users.java
+++ b/me/day05/practice/Users.java
@@ -15,7 +15,7 @@ public class Users {
     private int size;
     private int capacity;
 
-    Users(){
+    private Users(){
         userList = EMPTY_USER_LIST;
     }
 
@@ -75,36 +75,4 @@ public String toString() {
                 ", capacity=" + capacity +
                 ", userList= " + Arrays.toString(userList) + " }";
     }
-
-    //==================================== TEST CODE ====================================//
-    public void add (User user) {
-        if (userList == EMPTY_USER_LIST)
-            userList = new User[DEFAULT_CAPACITY];
-        /* 배열 크기 체크하고 늘리는 로직 구현 할 것 */
-        userList[size++] = user;
-    }
-
-    public static void main(String[] args) {
-        User userA = new User("A", "aaa", "aaaa", "aaa@aaa.com", "aaa", new Electronic[]{new Electronic()});
-        User userB = new User("B", "bbb", "bbbb", "bbb@bbb.com", "bbb", new Electronic[]{new Electronic()});
-        User userC = new User("C", "ccc", "cccc", "ccc@ccc.com", "ccc", new Electronic[]{new Electronic()});
-
-        Users userList = getInstance();
-        userList.add(userA);
-        userList.add(userB);
-        userList.add(userC);
-
-        System.out.println("findByID test");
-        Optional<User> a = userList.findById("A");
-        a.ifPresent(System.out::println);
-        System.out.println();
-
-
-        System.out.println("deep copy Test");
-        User copyA = userList.copy(userA);
-        copyA.setUserId("AA");
-
-        System.out.println(userA);
-        System.out.println(copyA);
-    }
 }