diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..99fccfa1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,47 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.DS_Store
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+/out/
+/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
\ No newline at end of file
diff --git a/README.md b/README.md
index ab6f4fe9..4f3dc604 100644
--- a/README.md
+++ b/README.md
@@ -46,4 +46,14 @@ dustndus8: [https://github.com/Learning-Now/2021-Java-Study/pull/20](https://git
dbswl067: [https://github.com/Learning-Now/2021-Java-Study/pull/23](https://github.com/Learning-Now/2021-Java-Study/pull/23)
### 4주차
+DongLee99: [https://github.com/Learning-Now/2021-Java-Study/pull/25](https://github.com/Learning-Now/2021-Java-Study/pull/25)
+Jeongyun: [https://github.com/Learning-Now/2021-Java-Study/pull/28](https://github.com/Learning-Now/2021-Java-Study/pull/28)
+
+BLINK-ONCE: [https://github.com/Learning-Now/2021-Java-Study/pull/27](https://github.com/Learning-Now/2021-Java-Study/pull/27)
+
+dustndus8: [https://github.com/Learning-Now/2021-Java-Study/pull/29](https://github.com/Learning-Now/2021-Java-Study/issues/29)
+
+dbswl067: [https://github.com/Learning-Now/2021-Java-Study/pull/30](https://github.com/Learning-Now/2021-Java-Study/pull/30)
+
+### 5주차
diff --git a/calculator/.gitignore b/calculator/.gitignore
new file mode 100644
index 00000000..99fccfa1
--- /dev/null
+++ b/calculator/.gitignore
@@ -0,0 +1,47 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.DS_Store
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+/out/
+/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
\ No newline at end of file
diff --git a/calculator/.idea/.gitignore b/calculator/.idea/.gitignore
new file mode 100644
index 00000000..73f69e09
--- /dev/null
+++ b/calculator/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/calculator/.idea/compiler.xml b/calculator/.idea/compiler.xml
new file mode 100644
index 00000000..61a9130c
--- /dev/null
+++ b/calculator/.idea/compiler.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/calculator/.idea/gradle.xml b/calculator/.idea/gradle.xml
new file mode 100644
index 00000000..ba1ec5c7
--- /dev/null
+++ b/calculator/.idea/gradle.xml
@@ -0,0 +1,16 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/calculator/.idea/jarRepositories.xml b/calculator/.idea/jarRepositories.xml
new file mode 100644
index 00000000..fdc392fe
--- /dev/null
+++ b/calculator/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/calculator/.idea/misc.xml b/calculator/.idea/misc.xml
new file mode 100644
index 00000000..2266f6bc
--- /dev/null
+++ b/calculator/.idea/misc.xml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/calculator/.idea/modules/calculator.iml b/calculator/.idea/modules/calculator.iml
new file mode 100644
index 00000000..01ef6d36
--- /dev/null
+++ b/calculator/.idea/modules/calculator.iml
@@ -0,0 +1,2 @@
+
+
\ No newline at end of file
diff --git a/calculator/.idea/vcs.xml b/calculator/.idea/vcs.xml
new file mode 100644
index 00000000..6c0b8635
--- /dev/null
+++ b/calculator/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/calculator/build.gradle b/calculator/build.gradle
new file mode 100644
index 00000000..b068f7a5
--- /dev/null
+++ b/calculator/build.gradle
@@ -0,0 +1,19 @@
+plugins {
+ id 'java'
+}
+
+group 'org.livestudy'
+version '1.0-SNAPSHOT'
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter', version: '5.7.0'
+ testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.18.1'
+}
+
+test {
+ useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/calculator/gradle/wrapper/gradle-wrapper.jar b/calculator/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..e708b1c0
Binary files /dev/null and b/calculator/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/calculator/gradle/wrapper/gradle-wrapper.properties b/calculator/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..be52383e
--- /dev/null
+++ b/calculator/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/calculator/gradlew b/calculator/gradlew
new file mode 100755
index 00000000..4f906e0c
--- /dev/null
+++ b/calculator/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or 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 UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG=`dirname "$PRG"`"/$link"
+ fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+ MAX_FD_LIMIT=`ulimit -H -n`
+ if [ $? -eq 0 ] ; then
+ if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+ MAX_FD="$MAX_FD_LIMIT"
+ fi
+ ulimit -n $MAX_FD
+ if [ $? -ne 0 ] ; then
+ warn "Could not set maximum file descriptor limit: $MAX_FD"
+ fi
+ else
+ warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+ fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+ GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # We build the pattern for arguments to be converted via cygpath
+ ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+ SEP=""
+ for dir in $ROOTDIRSRAW ; do
+ ROOTDIRS="$ROOTDIRS$SEP$dir"
+ SEP="|"
+ done
+ OURCYGPATTERN="(^($ROOTDIRS))"
+ # Add a user-defined pattern to the cygpath arguments
+ if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+ OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+ fi
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ i=0
+ for arg in "$@" ; do
+ CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+ CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
+
+ if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
+ eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+ else
+ eval `echo args$i`="\"$arg\""
+ fi
+ i=`expr $i + 1`
+ done
+ case $i in
+ 0) set -- ;;
+ 1) set -- "$args0" ;;
+ 2) set -- "$args0" "$args1" ;;
+ 3) set -- "$args0" "$args1" "$args2" ;;
+ 4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+ 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+ 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+ 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+ 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+ 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+ esac
+fi
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/calculator/gradlew.bat b/calculator/gradlew.bat
new file mode 100644
index 00000000..ac1b06f9
--- /dev/null
+++ b/calculator/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/calculator/settings.gradle b/calculator/settings.gradle
new file mode 100644
index 00000000..4b53eb35
--- /dev/null
+++ b/calculator/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'calculator'
+
diff --git a/calculator/src/main/java/Application.java b/calculator/src/main/java/Application.java
new file mode 100644
index 00000000..bdbffd53
--- /dev/null
+++ b/calculator/src/main/java/Application.java
@@ -0,0 +1,5 @@
+public class Application {
+ public static void main(String[] args) {
+
+ }
+}
diff --git a/calculator/src/test/java/empty.txt b/calculator/src/test/java/empty.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/gitignore.txt b/gitignore.txt
new file mode 100644
index 00000000..99fccfa1
--- /dev/null
+++ b/gitignore.txt
@@ -0,0 +1,47 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+.DS_Store
+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+/out/
+/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
\ No newline at end of file
diff --git a/racingcar/LICENSE b/racingcar/LICENSE
new file mode 100644
index 00000000..2e82af55
--- /dev/null
+++ b/racingcar/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 woowacourse
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/racingcar/README.md b/racingcar/README.md
new file mode 100644
index 00000000..008cf06a
--- /dev/null
+++ b/racingcar/README.md
@@ -0,0 +1,156 @@
+# 미션 - 자동차 경주 게임
+
+## 🚀 기능 요구사항
+- 주어진 횟수 동안 n대의 자동차는 전진 또는 멈출 수 있다.
+- 각 자동차에 이름을 부여할 수 있다. 전진하는 자동차를 출력할 때 자동차 이름을 같이 출력한다.
+- 자동차 이름은 쉼표(,)를 기준으로 구분하며 이름은 5자 이하만 가능하다.
+- 사용자는 몇 번의 이동을 할 것인지를 입력할 수 있어야 한다.
+- 전진하는 조건은 0에서 9 사이에서 random 값을 구한 후 random 값이 4 이상일 경우 전진하고, 3 이하의 값이면 멈춘다.
+- 자동차 경주 게임을 완료한 후 누가 우승했는지를 알려준다. 우승자는 한 명 이상일 수 있다.
+
+
+
+## ✍🏻 입출력 요구사항
+### ⌨️ 입력
+- 경주 할 자동차 이름(이름은 쉼표(,) 기준으로 구분)
+```
+pobi,woni,jun
+```
+- 시도할 회수
+```
+5
+```
+
+### 🖥 출력
+- 각 차수별 실행 결과
+```
+pobi : --
+woni : ----
+jun : ---
+```
+- 단독 우승자 안내 문구
+```
+최종 우승자: pobi
+```
+- 공동 우승자 안내 문구
+```
+최종 우승자: pobi, jun
+```
+- 예외 상황 시 에러 문구를 출력해야 한다. 단, 에러 문구는 [ERROR] 로 시작해야 한다.
+```
+[ERROR] 시도 횟수는 숫자여야 한다.
+```
+
+### 💻 프로그래밍 실행 결과 예시
+```
+경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)
+pobi,woni,jun
+시도할 회수는 몇회인가요?
+5
+
+실행 결과
+pobi : -
+woni :
+jun : -
+
+pobi : --
+woni : -
+jun : --
+
+pobi : ---
+woni : --
+jun : ---
+
+pobi : ----
+woni : ---
+jun : ----
+
+pobi : -----
+woni : ----
+jun : -----
+
+최종 우승자: pobi, jun
+```
+
+
+
+## 🎱 프로그래밍 요구사항
+- 자바 코드 컨벤션을 지키면서 프로그래밍한다.
+ - 기본적으로 [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)을 원칙으로 한다.
+ - 단, 들여쓰기는 '2 spaces'가 아닌 '4 spaces'로 한다.
+- indent(인덴트, 들여쓰기) depth를 3이 넘지 않도록 구현한다. 2까지만 허용한다.
+ - 예를 들어 while문 안에 if문이 있으면 들여쓰기는 2이다.
+ - 힌트: indent(인덴트, 들여쓰기) depth를 줄이는 좋은 방법은 함수(또는 메소드)를 분리하면 된다.
+- 3항 연산자를 쓰지 않는다.
+- 함수(또는 메소드)가 한 가지 일만 하도록 최대한 작게 만들어라.
+- 프로그래밍 요구사항에서 별도로 변경 불가 안내가 없는 경우 파일 수정과 패키지 이동을 자유롭게 할 수 있다.
+- 예외 상황 시 에러 문구를 출력해야 한다. 단, 에러 문구는 `[ERROR]` 로 시작해야 한다.
+
+### 추가된 요구사항
+- 함수(또는 메소드)의 길이가 15라인을 넘어가지 않도록 구현한다.
+ - 함수(또는 메소드)가 한 가지 일만 잘 하도록 구현한다.
+- else 예약어를 쓰지 않는다.
+ - 힌트: if 조건절에서 값을 return하는 방식으로 구현하면 else를 사용하지 않아도 된다.
+ - else를 쓰지 말라고 하니 switch/case로 구현하는 경우가 있는데 switch/case도 허용하지 않는다.
+
+### 프로그래밍 요구사항 - Application
+- Application 클래스를 활용해 구현해야 한다.
+- Application의 패키지 구조와 구현은 변경하지 않는다.
+- `final Scanner scanner = new Scanner(System.in);`는 변경하지 않는다.
+- `// TODO 구현 진행` 이 후 부터 구현한다.
+
+```java
+public class Application {
+ public static void main(String[] args) {
+ final Scanner scanner = new Scanner(System.in);
+ // TODO 구현 진행
+ }
+}
+```
+
+### 프로그래밍 요구사항 - RandomUtils
+- RandomUtils 클래스를 활용해 랜덤 기능을 구현해야 한다.
+- RandomUtils의 패키지 구조와 구현은 변경하지 않는다.
+
+```java
+private static final Random RANDOM = new Random();
+ private RandomUtils() {
+ }
+ public static int nextInt(final int startInclusive, final int endInclusive) {
+ ...
+```
+
+### 프로그래밍 요구사항 - Car 객체
+- 다음 Car 객체를 활용해 구현해야 한다.
+- Car 기본 생성자를 추가할 수 없다.
+- name, position 변수의 접근 제어자인 private을 변경할 수 없다.
+- 가능하면 setPosition(int position) 메소드를 추가하지 않고 구현한다.
+
+```java
+public class Car {
+ private final String name;
+ private int position = 0;
+
+ public Car(String name) {
+ this.name = name;
+ }
+
+ // 추가 기능 구현
+}
+```
+
+
+
+## 📈 진행 요구사항
+- 미션은 [java-racingcar-precourse 저장소](https://github.com/woowacourse/java-racingcar-precourse) 를 fork/clone해 시작한다.
+- 기능을 구현하기 전에 java-racingcar-precourse/docs/README.md 파일에 구현할 기능 목록을 정리해 추가한다.
+- git의 commit 단위는 앞 단계에서 README.md 파일에 정리한 기능 목록 단위로 추가한다.
+ - [AngularJS Commit Message Conventions](https://gist.github.com/stephenparish/9941e89d80e2bc58a153) 참고해 commit log를 남긴다.
+- [프리코스 과제 제출 문서](https://github.com/woowacourse/woowacourse-docs/tree/master/precourse) 절차를 따라 미션을 제출한다.
+ - [프리코스 과제 FAQ](https://github.com/woowacourse/woowacourse-docs/tree/master/precourse/faq) 문서를 참고하여 진행할 수 있다.
+
+
+
+## 📝 License
+
+This project is [MIT](https://github.com/woowacourse/java-racingcar-precourse/blob/master/LICENSE) licensed.
diff --git a/racingcar/build.gradle b/racingcar/build.gradle
new file mode 100644
index 00000000..dfc8cca6
--- /dev/null
+++ b/racingcar/build.gradle
@@ -0,0 +1,19 @@
+apply plugin: 'java'
+apply plugin: 'eclipse'
+
+version = '1.0.0'
+sourceCompatibility = 1.8
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testImplementation('org.junit.jupiter:junit-jupiter:5.7.0')
+ testImplementation('org.assertj:assertj-core:3.18.1')
+ testImplementation('org.mockito:mockito-inline:3.6.0')
+}
+
+test {
+ useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/racingcar/gradle/wrapper/gradle-wrapper.properties b/racingcar/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..dcf98e9d
--- /dev/null
+++ b/racingcar/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
\ No newline at end of file
diff --git a/racingcar/gradlew b/racingcar/gradlew
new file mode 100755
index 00000000..af6708ff
--- /dev/null
+++ b/racingcar/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG=`dirname "$PRG"`"/$link"
+ fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+ MAX_FD_LIMIT=`ulimit -H -n`
+ if [ $? -eq 0 ] ; then
+ if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+ MAX_FD="$MAX_FD_LIMIT"
+ fi
+ ulimit -n $MAX_FD
+ if [ $? -ne 0 ] ; then
+ warn "Could not set maximum file descriptor limit: $MAX_FD"
+ fi
+ else
+ warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+ fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+ GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # We build the pattern for arguments to be converted via cygpath
+ ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+ SEP=""
+ for dir in $ROOTDIRSRAW ; do
+ ROOTDIRS="$ROOTDIRS$SEP$dir"
+ SEP="|"
+ done
+ OURCYGPATTERN="(^($ROOTDIRS))"
+ # Add a user-defined pattern to the cygpath arguments
+ if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+ OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+ fi
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ i=0
+ for arg in "$@" ; do
+ CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+ CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
+
+ if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
+ eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+ else
+ eval `echo args$i`="\"$arg\""
+ fi
+ i=$((i+1))
+ done
+ case $i in
+ (0) set -- ;;
+ (1) set -- "$args0" ;;
+ (2) set -- "$args0" "$args1" ;;
+ (3) set -- "$args0" "$args1" "$args2" ;;
+ (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+ (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+ (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+ (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+ (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+ (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+ esac
+fi
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/racingcar/gradlew.bat b/racingcar/gradlew.bat
new file mode 100644
index 00000000..0f8d5937
--- /dev/null
+++ b/racingcar/gradlew.bat
@@ -0,0 +1,84 @@
+@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 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"
+
+@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 init
+
+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 init
+
+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
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+: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 %CMD_LINE_ARGS%
+
+: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/racingcar/src/main/java/racingcar/Application.java b/racingcar/src/main/java/racingcar/Application.java
new file mode 100644
index 00000000..069d73e1
--- /dev/null
+++ b/racingcar/src/main/java/racingcar/Application.java
@@ -0,0 +1,10 @@
+package racingcar;
+
+import java.util.Scanner;
+
+public class Application {
+ public static void main(String[] args) {
+ final Scanner scanner = new Scanner(System.in);
+ // TODO 구현 진행
+ }
+}
diff --git a/racingcar/src/main/java/racingcar/Car.java b/racingcar/src/main/java/racingcar/Car.java
new file mode 100644
index 00000000..ab3df949
--- /dev/null
+++ b/racingcar/src/main/java/racingcar/Car.java
@@ -0,0 +1,12 @@
+package racingcar;
+
+public class Car {
+ private final String name;
+ private int position = 0;
+
+ public Car(String name) {
+ this.name = name;
+ }
+
+ // 추가 기능 구현
+}
diff --git a/racingcar/src/main/java/utils/RandomUtils.java b/racingcar/src/main/java/utils/RandomUtils.java
new file mode 100644
index 00000000..63ba351d
--- /dev/null
+++ b/racingcar/src/main/java/utils/RandomUtils.java
@@ -0,0 +1,26 @@
+package utils;
+
+import java.util.Random;
+
+public class RandomUtils {
+ private static final Random RANDOM = new Random();
+
+ private RandomUtils() {
+ }
+
+ public static int nextInt(final int startInclusive, final int endInclusive) {
+ if (startInclusive > endInclusive) {
+ throw new IllegalArgumentException();
+ }
+
+ if (startInclusive < 0) {
+ throw new IllegalArgumentException();
+ }
+
+ if (startInclusive == endInclusive) {
+ return startInclusive;
+ }
+
+ return startInclusive + RANDOM.nextInt(endInclusive - startInclusive + 1);
+ }
+}
diff --git a/racingcar/src/test/java/empty.txt b/racingcar/src/test/java/empty.txt
new file mode 100644
index 00000000..e69de29b