diff --git a/day05/AuthMethod.java b/day05/AuthMethod.java
new file mode 100644
index 0000000..8c1c5e5
--- /dev/null
+++ b/day05/AuthMethod.java
@@ -0,0 +1,25 @@
+package me.day05;
+
+public enum AuthMethod {
+
+    FINGERPRINT("지문인증", 1),
+    PATTERN("패턴인증", 2),
+    PIN("핀인증", 3),
+    FACE("얼굴인증", 4);
+
+    private final String viewName;
+    private final int code;
+
+    AuthMethod(String viewName, int code) {
+        this.viewName = viewName;
+        this.code = code;
+    }
+
+    public String getViewName() {
+        return viewName;
+    }
+
+    public int getCode() {
+        return code;
+    }
+}
diff --git a/day05/Company.java b/day05/Company.java
new file mode 100644
index 0000000..09b6463
--- /dev/null
+++ b/day05/Company.java
@@ -0,0 +1,24 @@
+package me.day05;
+
+public enum Company {
+
+    SAMSUNG("삼성",1),
+    LG("엘지",2),
+    APPLE("애플",3);
+
+    private final String viewName;
+    private final int code;
+
+    Company(String viewName, int code) {
+        this.viewName = viewName;
+        this.code = code;
+    }
+
+    public String getViewName() {
+        return viewName;
+    }
+
+    public int getCode() {
+        return code;
+    }
+}
diff --git a/day05/Electronic.java b/day05/Electronic.java
new file mode 100644
index 0000000..137964f
--- /dev/null
+++ b/day05/Electronic.java
@@ -0,0 +1,56 @@
+package me.day05;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.util.Arrays;
+import java.util.Objects;
+
+public class Electronic {
+
+    private String productNo;
+    private  String modelName;
+    private Company company;
+    private LocalDateTime dateOfMade;
+    AuthMethod[] authMethod;
+
+    private static int AUTO_GEN = 0;
+
+    Electronic() {
+        AUTO_GEN++;
+        dateOfMade = LocalDateTime.now(ZoneId.systemDefault());
+        productNo = String.format("%02d", this.dateOfMade.getYear()) +
+                String.format("%02d", this.dateOfMade.getMonthValue()) +
+                String.format("%02d", this.dateOfMade.getDayOfMonth()) +
+                String.format("%04d", AUTO_GEN);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        Electronic electronic = (Electronic) obj;
+        return Objects.equals(productNo, electronic.productNo)
+                && Objects.equals(modelName, electronic.modelName)
+                && company == electronic.company
+                && Objects.equals(dateOfMade, electronic.dateOfMade)
+                && Arrays.equals(authMethod, electronic.authMethod);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = Objects.hash(productNo, modelName, company, dateOfMade);
+        result = 31 * result + Arrays.hashCode(authMethod);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Electronic{" +
+                "productNo='" + productNo + '\'' +
+                ", modelName='" + modelName + '\'' +
+                ", companyName=" + company +
+                ", dateOfMade=" + dateOfMade +
+                ", authMethod=" + Arrays.toString(authMethod) +
+                '}';
+    }
+}
+
diff --git a/day05/User.java b/day05/User.java
new file mode 100644
index 0000000..6ad5b80
--- /dev/null
+++ b/day05/User.java
@@ -0,0 +1,122 @@
+package me.day05;
+
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.util.Objects;
+
+public class User {
+
+    private String userId;
+    private String userPassword;
+    private String userPhoneNumber;
+    private String userEmail;
+    private LocalDate userBirthDate;
+    private Electronic[] electronicDevices;
+    private LocalTime registerTime;
+
+    User() {
+        registerTime = LocalTime.now(ZoneId.systemDefault());
+    }
+
+    public User(String userId, String userPassword) {
+        this();
+        this.userId = userId;
+        this.userPassword = userPassword;
+    }
+
+    public User(String userId, String userPassword, String userPhoneNumber, String userEmail, LocalDate userBirthDate, Electronic[] electronicDevices) {
+        this();
+        this.userId = userId;
+        this.userPassword = userPassword;
+        this.userPhoneNumber = userPhoneNumber;
+        this.userEmail = userEmail;
+        this.userBirthDate = userBirthDate;
+        this.electronicDevices = electronicDevices;
+    }
+
+    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 LocalDate getUserBirthDate() {
+        return userBirthDate;
+    }
+
+    public void setUserBirthDate(LocalDate userBirthDate) {
+        this.userBirthDate = userBirthDate;
+    }
+
+    public Electronic[] getElectronicDevices() {
+        return electronicDevices;
+    }
+
+    public void setElectronicDevices(Electronic[] electronicDevices) {
+        this.electronicDevices = electronicDevices;
+    }
+
+    public LocalTime getRegisterTime() {
+        return registerTime;
+    }
+
+    public void setRegisterTime(LocalTime registerTime) {
+        this.registerTime = registerTime;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        User user = (User) obj;
+        return Objects.equals(userId, user.userId) && Objects.equals(userPassword, user.userPassword)
+                && Objects.equals(userPhoneNumber, user.userPhoneNumber)
+                && Objects.equals(userEmail, user.userEmail)
+                && Objects.equals(userBirthDate, user.userBirthDate)
+                && Objects.equals(electronicDevices, user.electronicDevices);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(userId, userPassword, userPhoneNumber, userEmail, userBirthDate, electronicDevices);
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "userId='" + userId + '\'' +
+                ", userPassword='" + userPassword + '\'' +
+                ", userEmail='" + userEmail + '\'' +
+                ", userBirthDate='" + userBirthDate + '\'' +
+                ", electronicDevices=" + electronicDevices +
+                '}';
+    }
+
+}
diff --git a/day05/Users.java b/day05/Users.java
new file mode 100644
index 0000000..37678b5
--- /dev/null
+++ b/day05/Users.java
@@ -0,0 +1,31 @@
+package me.day05;
+
+import java.util.Arrays;
+
+public enum Users {
+
+    INSTANCE;
+
+    private User[] userList;
+
+    public User findByUserId(String userId) {
+        for(int i = 0; i < userList.length; i++) {
+            if (userId.equals(userList[i].getUserId())) {
+                return userList[i];
+            }
+        }
+        return null;
+    }
+
+    public User Copy(User user) {
+        User copyUser = new User();
+        copyUser.setUserId(user.getUserId());
+        copyUser.setUserEmail(user.getUserEmail());
+        copyUser.setUserPassword(user.getUserPassword());
+        copyUser.setUserBirthDate(user.getUserBirthDate());
+        copyUser.setUserPhoneNumber(user.getUserPhoneNumber());
+        copyUser.setElectronicDevices(Arrays.copyOf(user.getElectronicDevices(), user.getElectronicDevices().length));
+        return copyUser;
+    }
+
+}