diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..869d741f3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,43 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+.idea
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 000000000..668101a29
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,19 @@
+plugins {
+ id 'java'
+}
+
+group = 'com.sprint.mission'
+version = '1.0-SNAPSHOT'
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testImplementation platform('org.junit:junit-bom:5.10.0')
+ testImplementation 'org.junit.jupiter:junit-jupiter'
+}
+
+test {
+ useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 000000000..249e5832f
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 000000000..832641706
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Thu May 29 10:33:08 KST 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 000000000..1b6c78733
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+# Gradle start up script for POSIX generated by Gradle.
+#
+# Important for running:
+#
+# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+# noncompliant, but you have some other compliant shell such as ksh or
+# bash, then to run this script, type that shell name before the whole
+# command line, like:
+#
+# ksh Gradle
+#
+# Busybox and similar reduced shells will NOT work, because this script
+# requires all of these POSIX shell features:
+# * functions;
+# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+# * compound commands having a testable exit status, especially «case»;
+# * various built-in commands including «command», «set», and «ulimit».
+#
+# Important for patching:
+#
+# (2) This script targets any POSIX shell, so it avoids extensions provided
+# by Bash, Ksh, etc; in particular arrays are avoided.
+#
+# The "traditional" practice of packing multiple parameters into a
+# space-separated string is a well documented source of bugs and security
+# problems, so this is (mostly) avoided, by progressively accumulating
+# options in "$@", and eventually passing that to Java.
+#
+# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+# see the in-line comments for details.
+#
+# There are tweaks for specific operating systems such as AIX, CygWin,
+# Darwin, MinGW, and NonStop.
+#
+# (3) This script is generated from the Groovy template
+# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+# within the Gradle project.
+#
+# You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+ APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
+ [ -h "$app_path" ]
+do
+ ls=$( ls -ld "$app_path" )
+ link=${ls#*' -> '}
+ case $link in #(
+ /*) app_path=$link ;; #(
+ *) app_path=$APP_HOME$link ;;
+ esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+ echo "$*"
+} >&2
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in #(
+ CYGWIN* ) cygwin=true ;; #(
+ Darwin* ) darwin=true ;; #(
+ MSYS* | MINGW* ) msys=true ;; #(
+ NONSTOP* ) nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD=$JAVA_HOME/jre/sh/java
+ else
+ JAVACMD=$JAVA_HOME/bin/java
+ fi
+ if [ ! -x "$JAVACMD" ] ; then
+ die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD=java
+ which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+ case $MAX_FD in #(
+ max*)
+ MAX_FD=$( ulimit -H -n ) ||
+ warn "Could not query maximum file descriptor limit"
+ esac
+ case $MAX_FD in #(
+ '' | soft) :;; #(
+ *)
+ ulimit -n "$MAX_FD" ||
+ warn "Could not set maximum file descriptor limit to $MAX_FD"
+ esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+# * args from the command line
+# * the main class name
+# * -classpath
+# * -D...appname settings
+# * --module-path (only if needed)
+# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+ APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+ CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+ JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ for arg do
+ if
+ case $arg in #(
+ -*) false ;; # don't mess with options #(
+ /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
+ [ -e "$t" ] ;; #(
+ *) false ;;
+ esac
+ then
+ arg=$( cygpath --path --ignore --mixed "$arg" )
+ fi
+ # Roll the args list around exactly as many times as the number of
+ # args, so each arg winds up back in the position where it started, but
+ # possibly modified.
+ #
+ # NB: a `for` loop captures its iteration list before it begins, so
+ # changing the positional parameters here affects neither the number of
+ # iterations, nor the values presented in `arg`.
+ shift # remove old arg
+ set -- "$@" "$arg" # push replacement arg
+ done
+fi
+
+# Collect all arguments for the java command;
+# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+# shell script including quotes and variable substitutions, so put them in
+# double quotes to make sure that they get re-expanded; and
+# * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+ "-Dorg.gradle.appname=$APP_BASE_NAME" \
+ -classpath "$CLASSPATH" \
+ org.gradle.wrapper.GradleWrapperMain \
+ "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+# set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+ printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+ xargs -n1 |
+ sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+ tr '\n' ' '
+ )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 000000000..107acd32c
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 000000000..84879dca0
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = '1-sprint-mission'
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/Main.java b/src/main/java/com/sprint/mission/Main.java
new file mode 100644
index 000000000..882a926fd
--- /dev/null
+++ b/src/main/java/com/sprint/mission/Main.java
@@ -0,0 +1,10 @@
+package com.sprint.mission;
+
+//TIP 코드를 실행하려면 을(를) 누르거나
+// 에디터 여백에 있는 아이콘을 클릭하세요.
+public class Main {
+ public static void main(String[] args) {
+
+
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
new file mode 100644
index 000000000..e135d9d47
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
@@ -0,0 +1,102 @@
+package com.sprint.mission.discodeit;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.service.MessageService;
+import com.sprint.mission.discodeit.service.jcf.JCFChannelService;
+import com.sprint.mission.discodeit.service.jcf.JCFMessageService;
+import com.sprint.mission.discodeit.service.jcf.JCFUserService;
+
+public class JavaApplication {
+ public static void main(String[] args) {
+ JCFUserService userService = new JCFUserService();
+ JCFChannelService channelService = new JCFChannelService();
+ JCFMessageService messageService = new JCFMessageService();
+
+ /*
+
+ //아이디
+ //아이디 등록
+ User user1 = userService.createUser(new User("강은혁"));
+ User user2 = userService.createUser(new User("자바"));
+
+ //아이디 단건 조회
+ System.out.println("아이디 단건 조회 : " + userService.getUser(user1.getId()).getUsername());
+
+ //아이디 다건 조회
+ for(User u : userService.getUsers()) {
+ System.out.println("아이디 다건 조회 : " + u.getUsername());
+ }
+
+ //아이디 수정
+ userService.updateUser(user1.getId(), "Hello");
+ //수정된 아이디 조회
+ System.out.println("수정 된 아이디 조회 : " + userService.getUser(user1.getId()).getUsername());
+
+ //아이디 삭제
+ userService.deleteUser(user1.getId());
+ //아이디 삭제 후 조회
+ System.out.println("삭제 후 조회 : " + userService.getUser(user1.getId())== null ? "존재함" : "존재하지않음");
+
+
+ //채널
+ Channel channel1 = new Channel("Discodeit");
+ Channel channel2 = new Channel("Hello");
+ //채널 생성
+ channelService.createChannel(channel1);
+ channelService.createChannel(channel2);
+
+ //채널 단건 조회
+ System.out.println("채널 단건 조회 : " + channelService.getChannel(channel1.getId()).getChannel());
+
+ //채널 전체조회
+ for(Channel ch : channelService.getChannels()) {
+ System.out.println("채널 다건 조회 : " + ch.getChannel());
+ }
+
+ //채널 수정
+ channelService.updateChannel(channel1.getId(), "Discord");
+ System.out.println("채널의 수정 된 이름 : " + channelService.getChannel(channel1.getId()).getChannel());
+
+ //채널 삭제
+ channelService.deleteChannel(channelService.getChannel(channel1.getId()).getId());
+
+ //채널 삭제 후 조회
+ System.out.println("삭제 된 채널 : " + channelService.getChannel(channel1.getId()) == null ? "존재함" : "존재하지않음");
+ */
+
+ //메세지
+ User user = new User("EH");
+ Channel ch = new Channel("Discodeit");
+ Channel ch2 = new Channel("chtest");
+
+ Message message1 = new Message("Hello Discord!", user, ch);
+ Message message2 = new Message("test22", user, ch2);
+
+
+ //메세지 전송
+ System.out.println("메세지 : " + messageService.createMessage(message1, user, ch).getContent());
+ messageService.createMessage(message2, user, ch);
+
+ //단건 조회
+ System.out.println("메세지 단건 조회 : " + messageService.getMessage(message1.getId()).getContent());
+
+
+ //전체 조회
+ for(Message m : messageService.getMessages()){
+ System.out.println("메세지 다건 조회 : " + m.getContent());
+ }
+
+ //수정
+ messageService.updateMessage(message1.getId(), "헬로 디스코드!");
+
+ //수정 후 조회
+ System.out.println("수정 후 조회 : " + messageService.getMessage(message1.getId()).getContent());
+
+ //삭제
+ messageService.deleteMessage(message1.getId());
+ System.out.println("삭제 : " + messageService.getMessage(message1.getId()) == null ? "존재함" : "존재하지않음");
+
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java b/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java
new file mode 100644
index 000000000..341345799
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java
@@ -0,0 +1,33 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.UUID;
+
+public class BaseEntity {
+
+ private UUID id;
+ private Long createdAt;
+ private Long updatedAt;
+
+ public BaseEntity() {
+ this.id = UUID.randomUUID();
+ long time = System.currentTimeMillis();
+ this.createdAt = time;
+ this.updatedAt = time;
+ }
+
+ public UUID getId() {
+ return id;
+ }
+
+ public Long getCreatedAt() {
+ return createdAt;
+ }
+
+ public Long getUpdateAt() {
+ return updatedAt;
+ }
+
+ public void updateTimeStamp(){
+ this.updatedAt = System.currentTimeMillis();
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/Channel.java b/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
new file mode 100644
index 000000000..f190ac329
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
@@ -0,0 +1,63 @@
+package com.sprint.mission.discodeit.entity;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Channel extends BaseEntity {
+ private String channel;
+ private final List messages;
+ private final List users;
+
+ public Channel(String channel) {
+ super();
+ this.channel = channel;
+
+ this.messages = new ArrayList<>();
+ this.users = new ArrayList<>();
+ }
+
+ public List getUsers() {
+ return users;
+ }
+
+ public String getChannel() {
+ return channel;
+ }
+
+ public void updateChannel(String updateChannel){
+ this.channel = updateChannel;
+ updateTimeStamp();
+ }
+
+ //추가
+ public void addUser(User user){
+ if(!users.contains(user)) {
+ users.add(user);
+ user.addChannel(this);
+ }
+ }
+ //추가
+ public void addMessage(Message message){
+ if(!messages.contains(message)) {
+ messages.add(message);
+ message.addChannel(this);
+ }
+ }
+ public void deleteMessage(Message message){
+ if(!messages.contains(message)){
+ messages.remove(message);
+ message.deleteChannel(this);
+ }
+ }
+
+ public void deleteUser(User user){
+ if(!users.contains(user)){
+ users.remove(user);
+ user.deleteChannel(this);
+ }
+ }
+
+ //추가
+ public List getMessages(){
+ return messages;
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/Message.java b/src/main/java/com/sprint/mission/discodeit/entity/Message.java
new file mode 100644
index 000000000..9be9c8915
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/Message.java
@@ -0,0 +1,45 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class Message extends BaseEntity {
+ private String content;
+ private User user;
+ private Channel channel;
+
+ public Message(String content, User user, Channel channel) {
+ super();
+ this.content = content;
+ this.user = user;
+ this.channel = channel;
+ }
+
+ public String getContent() {
+ return content;
+ }
+
+
+ public void addUser(User user){
+ this.user = user;
+ }
+
+ public void deleteUser(User user){
+ this.user = user;
+ }
+
+ public void addChannel(Channel channel){
+ this.channel = channel;
+ }
+
+ public void deleteChannel(Channel channel){
+ this.channel = channel;
+ }
+
+ public void updateContent(String newContent){
+ this.content = newContent;
+ updateTimeStamp();
+ }
+
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/User.java b/src/main/java/com/sprint/mission/discodeit/entity/User.java
new file mode 100644
index 000000000..e6437be76
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/User.java
@@ -0,0 +1,67 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.lang.reflect.Array;
+import java.nio.channels.Channels;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class User extends BaseEntity {
+ private String username;
+ private final List messages;
+ private final List channels;
+
+ public User(String name) {
+ super();
+ this.username = name;
+
+ //추가
+ this.messages = new ArrayList();
+ this.channels = new ArrayList();
+ }
+
+ public String getUsername() {
+ return username;
+ }
+
+ public void updateName(String userName){
+ this.username = userName;
+ }
+
+ //유저의 Message 목록에 추가
+ public void addMessage(Message message){
+ if(!messages.contains(message)) {
+ messages.add(message);
+ message.addUser(this);
+ }
+ }
+
+ //유저의 Channel 목록에 추가
+ public void addChannel(Channel channel){
+ if(!channels.contains(channel)) {
+ channels.add(channel);
+ channel.addUser(this);
+ }
+ }
+
+ public void deleteChannel(Channel channel){
+ if(!channels.contains(channel)){
+ channels.remove(channel);
+ channel.deleteUser(this);
+ }
+ }
+
+ public void deleteMessage(Message message){
+ if(!messages.contains(message)) {
+ messages.remove(message);
+ message.deleteUser(this);
+ }
+ }
+ public List getChannels(){
+ return channels;
+ }
+
+ public List getMessages(){
+ return messages;
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java b/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
new file mode 100644
index 000000000..e5a116c7e
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
@@ -0,0 +1,15 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.Channel;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface ChannelService {
+ Channel createChannel(Channel name);
+ Channel getChannel(UUID name);
+ List getChannels();
+ void updateChannel(UUID name, String Channel);
+ boolean deleteChannel(UUID name);
+
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/MessageService.java b/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
new file mode 100644
index 000000000..6ed6f5fbf
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
@@ -0,0 +1,17 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface MessageService {
+ Message createMessage(Message create, User user, Channel channel);
+ Message getMessage(UUID id);
+ List getMessages();
+ void updateMessage (UUID id, String message);
+ boolean deleteMessage (UUID id);
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/service/UserService.java b/src/main/java/com/sprint/mission/discodeit/service/UserService.java
new file mode 100644
index 000000000..526f74490
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/UserService.java
@@ -0,0 +1,14 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface UserService {
+ User createUser(User user);
+ User getUser(UUID id);
+ List getUsers();
+ void updateUser (UUID id, String username);
+ boolean deleteUser (UUID id);
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
new file mode 100644
index 000000000..9c19ebd86
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
@@ -0,0 +1,44 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.service.ChannelService;
+
+import java.util.*;
+
+public class JCFChannelService implements ChannelService {
+ HashMap data = new HashMap<>();
+
+ @Override
+ public Channel createChannel(Channel channel) {
+ data.put(channel.getId(), channel);
+ return channel;
+ }
+
+ @Override
+ public Channel getChannel(UUID id) {
+ return data.get(id);
+ }
+
+ @Override
+ public List getChannels() {
+ return new ArrayList<>(data.values());
+ }
+
+ @Override
+ public void updateChannel(UUID name, String Channel) {
+ Channel channel = data.get(name);
+ if(name != null){
+ channel.updateChannel(Channel);
+ }
+ }
+
+ @Override
+ public boolean deleteChannel(UUID name) {
+ if(!data.containsKey(name)){
+ System.out.println("삭제할 채널이 존재하지 않습니다.");
+ return false;
+ }
+ data.remove(name);
+ return true;
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
new file mode 100644
index 000000000..4406e28e8
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
@@ -0,0 +1,52 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.service.MessageService;
+
+import java.util.*;
+
+public class JCFMessageService implements MessageService {
+ HashMap data = new HashMap<>();
+
+ @Override
+ public Message createMessage(Message message, User user, Channel channel) {
+ data.put(message.getId(), message);
+
+ //추가
+ user.addMessage(message);
+ channel.addMessage(message);
+ channel.addUser(user);
+ message.addUser(user);
+ return message;
+ }
+
+ @Override
+ public Message getMessage(UUID id) {
+ return data.get(id);
+ }
+
+ @Override
+ public List getMessages() {
+ return new ArrayList<>(data.values());
+ }
+
+ @Override
+ public void updateMessage(UUID id, String newMessage) {
+ Message message = data.get(id);
+ if (message != null) {
+ message.updateContent(newMessage);
+ }
+ }
+
+ @Override
+ public boolean deleteMessage(UUID id) {
+ if (!data.containsKey(id)) {
+ System.out.println("삭제할 메세지가 존재하지 않습니다");
+ return false;
+ }
+ data.remove(id);
+ return true;
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
new file mode 100644
index 000000000..65da91b92
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
@@ -0,0 +1,45 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.service.UserService;
+
+import java.util.*;
+
+public class JCFUserService implements UserService {
+ private final HashMap data = new HashMap<>();
+
+ @Override
+ public User createUser(User user){
+ data.put(user.getId(), user);
+ return user;
+ }
+
+ @Override
+ public User getUser(UUID id){
+ return data.get(id);
+ }
+
+ @Override
+ public List getUsers(){
+ return new ArrayList<>(data.values());
+ }
+
+ @Override
+ public void updateUser(UUID id, String username){
+ User user = data.get(id);
+ if(user != null){
+ user.updateName(username);
+ }
+ }
+
+ @Override
+ public boolean deleteUser(UUID id) {
+ if(!data.containsKey(id)){
+ System.out.println("삭제할 유저가 존재하지 않습니다.");
+ return false;
+ }
+ data.remove(id);
+ return true;
+ }
+ }
+