From fac41373b58c7795cb0a82a4115e77abfbd8412e Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Fri, 9 Jun 2023 19:48:21 +0900
Subject: [PATCH 01/11] feat: setup calculator project

---
 .gitattributes                                |   9 +
 .gitignore                                    |  25 ++
 app/build.gradle                              |  42 +++
 app/src/main/java/java/calculator/App.java    |  14 +
 .../test/java/java/calculator/AppTest.java    |  14 +
 gradlew                                       | 245 ++++++++++++++++++
 gradlew.bat                                   |  92 +++++++
 settings.gradle                               |  16 ++
 8 files changed, 457 insertions(+)
 create mode 100644 .gitattributes
 create mode 100644 .gitignore
 create mode 100644 app/build.gradle
 create mode 100644 app/src/main/java/java/calculator/App.java
 create mode 100644 app/src/test/java/java/calculator/AppTest.java
 create mode 100755 gradlew
 create mode 100644 gradlew.bat
 create mode 100644 settings.gradle

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..097f9f98d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..ffc7a1641
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+# Compiled class files
+*.class
+
+# Log files
+*.log
+
+# IntelliJ IDEA files
+.idea/
+
+# Eclipse files
+.classpath
+.project
+.settings/
+
+# Build output
+build/
+out/
+
+# Dependency directories
+.lib/
+libs/
+
+# Gradle specific
+.gradle/
+gradle/
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 000000000..5c295fd53
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,42 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/8.1.1/userguide/building_java_projects.html
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.1'
+
+    // This dependency is used by the application.
+    implementation 'com.google.guava:guava:31.1-jre'
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'java.calculator.App'
+}
+
+tasks.named('test') {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}
diff --git a/app/src/main/java/java/calculator/App.java b/app/src/main/java/java/calculator/App.java
new file mode 100644
index 000000000..253d03169
--- /dev/null
+++ b/app/src/main/java/java/calculator/App.java
@@ -0,0 +1,14 @@
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package java.calculator;
+
+public class App {
+    public String getGreeting() {
+        return "Hello World!";
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new App().getGreeting());
+    }
+}
diff --git a/app/src/test/java/java/calculator/AppTest.java b/app/src/test/java/java/calculator/AppTest.java
new file mode 100644
index 000000000..6bc4c6308
--- /dev/null
+++ b/app/src/test/java/java/calculator/AppTest.java
@@ -0,0 +1,14 @@
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package java.calculator;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class AppTest {
+    @Test void appHasAGreeting() {
+        App classUnderTest = new App();
+        assertNotNull(classUnderTest.getGreeting(), "app should have a greeting");
+    }
+}
diff --git a/gradlew b/gradlew
new file mode 100755
index 000000000..aeb74cbb4
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,245 @@
+#!/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/HEAD/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
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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 $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$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
+
+
+# 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"'
+
+# 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 "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# 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..93e3f59f1
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,92 @@
+@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=.
+@rem This is normally unused
+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% equ 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% equ 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!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 000000000..24a4aa2a0
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,16 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/8.1.1/userguide/multi_project_builds.html
+ */
+
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.4.0'
+}
+
+rootProject.name = 'java-calculator'
+include('app')

From c6aa8382e264729f8d39a50173e40ac4227bb954 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:33:09 +0900
Subject: [PATCH 02/11] =?UTF-8?q?feat:=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20?=
 =?UTF-8?q?=EB=94=94=ED=8E=9C=EB=8D=98=EC=8B=9C=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/build.gradle | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/app/build.gradle b/app/build.gradle
index 5c295fd53..d85977dc6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -22,6 +22,10 @@ dependencies {
 
     // This dependency is used by the application.
     implementation 'com.google.guava:guava:31.1-jre'
+    testImplementation 'org.assertj:assertj-core:3.21.0'
+    // JUnit 5
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.7.2'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
 }
 
 // Apply a specific Java toolchain to ease working on different environments.

From 6c74d03aae37c84851f903708f18be11d47626b4 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:52:07 +0900
Subject: [PATCH 03/11] =?UTF-8?q?feat:=20main=20=EC=B4=88=EA=B8=B0?=
 =?UTF-8?q?=ED=99=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/java/java/calculator/App.java     | 14 --------------
 app/src/test/java/java/calculator/AppTest.java | 14 --------------
 2 files changed, 28 deletions(-)
 delete mode 100644 app/src/main/java/java/calculator/App.java
 delete mode 100644 app/src/test/java/java/calculator/AppTest.java

diff --git a/app/src/main/java/java/calculator/App.java b/app/src/main/java/java/calculator/App.java
deleted file mode 100644
index 253d03169..000000000
--- a/app/src/main/java/java/calculator/App.java
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
-package java.calculator;
-
-public class App {
-    public String getGreeting() {
-        return "Hello World!";
-    }
-
-    public static void main(String[] args) {
-        System.out.println(new App().getGreeting());
-    }
-}
diff --git a/app/src/test/java/java/calculator/AppTest.java b/app/src/test/java/java/calculator/AppTest.java
deleted file mode 100644
index 6bc4c6308..000000000
--- a/app/src/test/java/java/calculator/AppTest.java
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
-package java.calculator;
-
-import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.*;
-
-class AppTest {
-    @Test void appHasAGreeting() {
-        App classUnderTest = new App();
-        assertNotNull(classUnderTest.getGreeting(), "app should have a greeting");
-    }
-}

From 856cad6cd7c4442a5818e43ce9fc488e1d9ed4bf Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:52:47 +0900
Subject: [PATCH 04/11] =?UTF-8?q?feat:=20operation=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../calculator/model/operation/Addition.java    | 13 +++++++++++++
 .../model/operation/CalculationOperation.java   |  7 +++++++
 .../calculator/model/operation/Division.java    | 17 +++++++++++++++++
 .../model/operation/Multiplication.java         | 13 +++++++++++++
 .../calculator/model/operation/Subtraction.java | 13 +++++++++++++
 5 files changed, 63 insertions(+)
 create mode 100644 app/src/main/java/example/calculator/model/operation/Addition.java
 create mode 100644 app/src/main/java/example/calculator/model/operation/CalculationOperation.java
 create mode 100644 app/src/main/java/example/calculator/model/operation/Division.java
 create mode 100644 app/src/main/java/example/calculator/model/operation/Multiplication.java
 create mode 100644 app/src/main/java/example/calculator/model/operation/Subtraction.java

diff --git a/app/src/main/java/example/calculator/model/operation/Addition.java b/app/src/main/java/example/calculator/model/operation/Addition.java
new file mode 100644
index 000000000..162b98aec
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/operation/Addition.java
@@ -0,0 +1,13 @@
+package example.calculator.model.operation;
+
+public class Addition implements CalculationOperation {
+    @Override
+    public double calculate(double a, double b) {
+        return a + b;
+    }
+
+    @Override
+    public String getOperator() {
+        return "+";
+    }
+}
diff --git a/app/src/main/java/example/calculator/model/operation/CalculationOperation.java b/app/src/main/java/example/calculator/model/operation/CalculationOperation.java
new file mode 100644
index 000000000..1ff06ce0e
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/operation/CalculationOperation.java
@@ -0,0 +1,7 @@
+package example.calculator.model.operation;
+
+public interface CalculationOperation {
+    double calculate(double a, double b);
+
+    String getOperator();
+}
diff --git a/app/src/main/java/example/calculator/model/operation/Division.java b/app/src/main/java/example/calculator/model/operation/Division.java
new file mode 100644
index 000000000..81fbc92b1
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/operation/Division.java
@@ -0,0 +1,17 @@
+package example.calculator.model.operation;
+
+public class Division implements CalculationOperation {
+    @Override
+    public double calculate(double a, double b) {
+        if (b != 0) {
+            return a / b;
+        } else {
+            throw new IllegalArgumentException("Cannot divide by zero.");
+        }
+    }
+
+    @Override
+    public String getOperator() {
+        return "/";
+    }
+}
diff --git a/app/src/main/java/example/calculator/model/operation/Multiplication.java b/app/src/main/java/example/calculator/model/operation/Multiplication.java
new file mode 100644
index 000000000..c406821b7
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/operation/Multiplication.java
@@ -0,0 +1,13 @@
+package example.calculator.model.operation;
+
+public class Multiplication implements CalculationOperation {
+    @Override
+    public double calculate(double a, double b) {
+        return a * b;
+    }
+
+    @Override
+    public String getOperator() {
+        return "*";
+    }
+}
diff --git a/app/src/main/java/example/calculator/model/operation/Subtraction.java b/app/src/main/java/example/calculator/model/operation/Subtraction.java
new file mode 100644
index 000000000..c3b8c5187
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/operation/Subtraction.java
@@ -0,0 +1,13 @@
+package example.calculator.model.operation;
+
+public class Subtraction implements CalculationOperation {
+    @Override
+    public double calculate(double a, double b) {
+        return a - b;
+    }
+
+    @Override
+    public String getOperator() {
+        return "-";
+    }
+}

From e8a7b09776a811ea41526d71a1eeeba202e63c82 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:53:17 +0900
Subject: [PATCH 05/11] =?UTF-8?q?feat:=20ui=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/example/calculator/view/Input.java   | 19 +++++++++++++++++
 .../java/example/calculator/view/Output.java  | 21 +++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 app/src/main/java/example/calculator/view/Input.java
 create mode 100644 app/src/main/java/example/calculator/view/Output.java

diff --git a/app/src/main/java/example/calculator/view/Input.java b/app/src/main/java/example/calculator/view/Input.java
new file mode 100644
index 000000000..82fa643d0
--- /dev/null
+++ b/app/src/main/java/example/calculator/view/Input.java
@@ -0,0 +1,19 @@
+package example.calculator.view;
+
+import java.util.Scanner;
+
+public class Input {
+    private Scanner scanner;
+
+    public Input() {
+        scanner = new Scanner(System.in);
+    }
+
+    public int getIntInput() {
+        return scanner.nextInt();
+    }
+
+    public String getStringInput() {
+        return scanner.nextLine();
+    }
+}
diff --git a/app/src/main/java/example/calculator/view/Output.java b/app/src/main/java/example/calculator/view/Output.java
new file mode 100644
index 000000000..e488a086c
--- /dev/null
+++ b/app/src/main/java/example/calculator/view/Output.java
@@ -0,0 +1,21 @@
+package example.calculator.view;
+
+import example.calculator.model.Menu;
+import java.util.List;
+
+public class Output {
+    public void printCalculationHistory(List<String> calculationHistory) {
+        for (String history : calculationHistory) {
+            System.out.println(history);
+        }
+    }
+
+    public void printMenu() {
+        System.out.println(Menu.조회.getValue() + ". " + Menu.조회);
+        System.out.println(Menu.계산.getValue() + ". " + Menu.계산);
+    }
+
+    public void printResult(double result) {
+        System.out.println("결과: " + result);
+    }
+}

From 344e591b65b815ad01dbb2614caa14b4d1c18dcd Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:53:35 +0900
Subject: [PATCH 06/11] =?UTF-8?q?feat:=20=EC=82=AC=EC=B9=99=EC=97=B0?=
 =?UTF-8?q?=EC=82=B0=20=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/java/example/Main.java           | 14 +++
 .../calculator/CalculatorController.java      | 47 ++++++++++
 .../example/calculator/model/Calculator.java  | 87 +++++++++++++++++++
 .../java/example/calculator/model/Menu.java   | 16 ++++
 4 files changed, 164 insertions(+)
 create mode 100644 app/src/main/java/example/Main.java
 create mode 100644 app/src/main/java/example/calculator/CalculatorController.java
 create mode 100644 app/src/main/java/example/calculator/model/Calculator.java
 create mode 100644 app/src/main/java/example/calculator/model/Menu.java

diff --git a/app/src/main/java/example/Main.java b/app/src/main/java/example/Main.java
new file mode 100644
index 000000000..81f6425cf
--- /dev/null
+++ b/app/src/main/java/example/Main.java
@@ -0,0 +1,14 @@
+package example;
+
+import example.calculator.CalculatorController;
+import example.calculator.model.Calculator;
+import example.calculator.view.Input;
+import example.calculator.view.Output;
+
+public class Main {
+    public static void main(String[] args) {
+        CalculatorController calculatorController = new CalculatorController(new Input(), new Output(),
+                new Calculator());
+        calculatorController.start();
+    }
+}
diff --git a/app/src/main/java/example/calculator/CalculatorController.java b/app/src/main/java/example/calculator/CalculatorController.java
new file mode 100644
index 000000000..5a8b83e75
--- /dev/null
+++ b/app/src/main/java/example/calculator/CalculatorController.java
@@ -0,0 +1,47 @@
+package example.calculator;
+
+import example.calculator.model.Calculator;
+import example.calculator.view.Output;
+import example.calculator.view.Input;
+
+public class CalculatorController {
+    private Input input;
+    private Output output;
+    private Calculator calculator;
+
+    public CalculatorController(Input input, Output output, Calculator calculator) {
+        this.input = input;
+        this.output = output;
+        this.calculator = calculator;
+    }
+
+    public void start() {
+        while (true) {
+            output.printMenu();
+            int choice = input.getIntInput();
+
+            switch (choice) {
+                case 1:
+                    output.printCalculationHistory(calculator.getCalculationHistory());
+                    break;
+                case 2:
+                    handleCalculation();
+                    break;
+                default:
+                    System.out.println("잘못된 선택입니다. 다시 선택해주세요.");
+            }
+        }
+    }
+
+    private void handleCalculation() {
+        input.getStringInput();
+
+        System.out.print("수식을 입력하세요: ");
+        String expression = input.getStringInput();
+
+        String[] tokens = expression.split("\\s+");
+        double result = calculator.handleCalculation(tokens, expression);
+
+        output.printResult(result);
+    }
+}
diff --git a/app/src/main/java/example/calculator/model/Calculator.java b/app/src/main/java/example/calculator/model/Calculator.java
new file mode 100644
index 000000000..c6819c65b
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/Calculator.java
@@ -0,0 +1,87 @@
+package example.calculator.model;
+
+import example.calculator.model.operation.Addition;
+import example.calculator.model.operation.CalculationOperation;
+import example.calculator.model.operation.Division;
+import example.calculator.model.operation.Multiplication;
+import example.calculator.model.operation.Subtraction;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Calculator {
+    private Map<String, CalculationOperation> calculationOperations;
+    private List<String> calculationHistory;
+
+    public Calculator() {
+        calculationOperations = new HashMap<>();
+        calculationOperations.put("*", new Multiplication());
+        calculationOperations.put("/", new Division());
+        calculationOperations.put("+", new Addition());
+        calculationOperations.put("-", new Subtraction());
+
+        calculationHistory = new ArrayList<>();
+    }
+
+    public List<String> getCalculationHistory() {
+        return calculationHistory;
+    }
+
+    public double calculate(double a, double b, String operator) {
+        CalculationOperation operation = calculationOperations.get(operator);
+        if (operation == null) {
+            throw new IllegalArgumentException("Invalid operator: " + operator);
+        }
+
+        return operation.calculate(a, b);
+    }
+
+    private void addToCalculationHistory(String expression) {
+        calculationHistory.add(expression);
+    }
+
+    public double handleCalculation(String[] tokens, String expression) {
+        List<String> operators = new ArrayList<>();
+        List<Double> operands = new ArrayList<>();
+
+        for (String token : tokens) {
+            if (token.matches("[+\\-*/]")) {
+                operators.add(token);
+            } else {
+                operands.add(Double.parseDouble(token));
+            }
+        }
+
+        double result = getResult(operators, operands);
+
+        String calculationExpression = expression.replaceAll("\\s+", "");
+        addToCalculationHistory(calculationExpression + " = " + result);
+        return result;
+    }
+
+    private double getResult(List<String> operators, List<Double> operands) {
+        calculateOperations(operands, operators, "*", "/");
+        calculateOperations(operands, operators, "+", "-");
+
+        return operands.get(0);
+    }
+
+    private void calculateOperations(List<Double> operands, List<String> operators, String... targetOperators) {
+        for (String targetOperator : targetOperators) {
+            for (int i = 0; i < operators.size(); i++) {
+                String operator = operators.get(i);
+                if (operator.equals(targetOperator)) {
+                    double operand1 = operands.get(i);
+                    double operand2 = operands.get(i + 1);
+                    double result = calculate(operand1, operand2, operator);
+
+                    operands.set(i, result);
+                    operands.remove(i + 1);
+                    operators.remove(i);
+                    i--;
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/example/calculator/model/Menu.java b/app/src/main/java/example/calculator/model/Menu.java
new file mode 100644
index 000000000..0b8085e65
--- /dev/null
+++ b/app/src/main/java/example/calculator/model/Menu.java
@@ -0,0 +1,16 @@
+package example.calculator.model;
+
+public enum Menu {
+    조회(1),
+    계산(2);
+
+    private final int value;
+
+    Menu(int value) {
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+}

From 844bad2459afee1a2c6b79ec6eb23088c4bb8362 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Sat, 10 Jun 2023 11:55:24 +0900
Subject: [PATCH 07/11] =?UTF-8?q?test:=20=EC=82=AC=EC=B9=99=EC=97=B0?=
 =?UTF-8?q?=EC=82=B0=20=EA=B8=B0=EB=8A=A5=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20?=
 =?UTF-8?q?=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../calculator/model/CalculatorTest.java      | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 app/src/test/java/example/calculator/model/CalculatorTest.java

diff --git a/app/src/test/java/example/calculator/model/CalculatorTest.java b/app/src/test/java/example/calculator/model/CalculatorTest.java
new file mode 100644
index 000000000..b0edacd7c
--- /dev/null
+++ b/app/src/test/java/example/calculator/model/CalculatorTest.java
@@ -0,0 +1,28 @@
+package example.calculator.model;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class CalculatorTest {
+
+    @ParameterizedTest
+    @MethodSource("testData")
+    public void testCalculate(double operand1, double operand2, String operator, double expected) {
+        Calculator calculator = new Calculator();
+        double result = calculator.calculate(operand1, operand2, operator);
+        assertThat(result).isEqualTo(expected);
+    }
+
+    private static Stream<Arguments> testData() {
+        return Stream.of(
+                Arguments.of(1, 2, "+", 3),
+                Arguments.of(1, 2, "-", -1),
+                Arguments.of(2, 3, "*", 6),
+                Arguments.of(4, 2, "/", 2)
+        );
+    }
+}
\ No newline at end of file

From 6f0ad7b0edd6cab6b6dbf82cbb904884fb4e6601 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Thu, 15 Jun 2023 18:24:00 +0900
Subject: [PATCH 08/11] =?UTF-8?q?feat:=20Menu=20=ED=81=B4=EB=9E=98?=
 =?UTF-8?q?=EC=8A=A4=20=EC=88=98=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/example/calculator/model/Menu.java    | 18 ++++++++++++++----
 .../java/example/calculator/view/Output.java   |  4 ++--
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/app/src/main/java/example/calculator/model/Menu.java b/app/src/main/java/example/calculator/model/Menu.java
index 0b8085e65..c34f4aff9 100644
--- a/app/src/main/java/example/calculator/model/Menu.java
+++ b/app/src/main/java/example/calculator/model/Menu.java
@@ -1,16 +1,26 @@
 package example.calculator.model;
-
 public enum Menu {
-    조회(1),
-    계산(2);
+    조회(1, "조회"),
+    계산(2, "계산");
 
     private final int value;
+    private final String name;
 
-    Menu(int value) {
+    Menu(int value, String name) {
         this.value = value;
+        this.name = name;
     }
 
     public int getValue() {
         return value;
     }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getFormattedInfo() {
+        return value + ". " + name;
+    }
 }
+
diff --git a/app/src/main/java/example/calculator/view/Output.java b/app/src/main/java/example/calculator/view/Output.java
index e488a086c..a35f24861 100644
--- a/app/src/main/java/example/calculator/view/Output.java
+++ b/app/src/main/java/example/calculator/view/Output.java
@@ -11,8 +11,8 @@ public void printCalculationHistory(List<String> calculationHistory) {
     }
 
     public void printMenu() {
-        System.out.println(Menu.조회.getValue() + ". " + Menu.조회);
-        System.out.println(Menu.계산.getValue() + ". " + Menu.계산);
+        System.out.println(Menu.조회.getFormattedInfo());
+        System.out.println(Menu.계산.getFormattedInfo());
     }
 
     public void printResult(double result) {

From 8ea8204b569b09310801a23800f13dedeef57735 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Thu, 15 Jun 2023 18:31:41 +0900
Subject: [PATCH 09/11] =?UTF-8?q?refactor:=20=EB=A7=A4=EC=A7=81=20?=
 =?UTF-8?q?=EB=84=98=EB=B2=84=20=EB=B6=84=EB=A6=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../calculator/CalculatorController.java      | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/example/calculator/CalculatorController.java b/app/src/main/java/example/calculator/CalculatorController.java
index 5a8b83e75..56c33f715 100644
--- a/app/src/main/java/example/calculator/CalculatorController.java
+++ b/app/src/main/java/example/calculator/CalculatorController.java
@@ -5,6 +5,8 @@
 import example.calculator.view.Input;
 
 public class CalculatorController {
+    private static final int MENU_VIEW_HISTORY = 1;
+    private static final int MENU_HANDLE_CALCULATION = 2;
     private Input input;
     private Output output;
     private Calculator calculator;
@@ -16,19 +18,22 @@ public CalculatorController(Input input, Output output, Calculator calculator) {
     }
 
     public void start() {
-        while (true) {
+        boolean isRunning = true;
+
+        while (isRunning) {
             output.printMenu();
-            int choice = input.getIntInput();
+            int userChoice = input.getIntInput();
 
-            switch (choice) {
-                case 1:
+            switch (userChoice) {
+                case MENU_VIEW_HISTORY:
                     output.printCalculationHistory(calculator.getCalculationHistory());
                     break;
-                case 2:
+                case MENU_HANDLE_CALCULATION:
                     handleCalculation();
                     break;
                 default:
-                    System.out.println("잘못된 선택입니다. 다시 선택해주세요.");
+                    isRunning = false;  // 루프 종료 조건
+                    break;
             }
         }
     }
@@ -36,7 +41,7 @@ public void start() {
     private void handleCalculation() {
         input.getStringInput();
 
-        System.out.print("수식을 입력하세요: ");
+        output.printMessage();
         String expression = input.getStringInput();
 
         String[] tokens = expression.split("\\s+");

From 81b1bc2ed3cda69409e74007f0b66b82124fa700 Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Thu, 15 Jun 2023 18:32:07 +0900
Subject: [PATCH 10/11] =?UTF-8?q?refactor:=20printMessage=20output=20?=
 =?UTF-8?q?=ED=81=B4=EB=9E=98=EC=8A=A4=EB=A1=9C=20=EB=B3=80=EA=B2=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/java/example/calculator/view/Output.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/app/src/main/java/example/calculator/view/Output.java b/app/src/main/java/example/calculator/view/Output.java
index a35f24861..6649459b7 100644
--- a/app/src/main/java/example/calculator/view/Output.java
+++ b/app/src/main/java/example/calculator/view/Output.java
@@ -18,4 +18,8 @@ public void printMenu() {
     public void printResult(double result) {
         System.out.println("결과: " + result);
     }
+
+    public void printMessage() {
+        System.out.print("수식을 입력하세요: ");
+    }
 }

From 8aace2ee2a9b455ac3517ad5fb52df183db1278e Mon Sep 17 00:00:00 2001
From: bumwoo <gld55602@gmail.com>
Date: Thu, 15 Jun 2023 18:33:31 +0900
Subject: [PATCH 11/11] =?UTF-8?q?refactor:=20Pattern=20=EA=B0=9D=EC=B2=B4?=
 =?UTF-8?q?=20=EC=83=81=EC=88=98=20=EB=B6=84=EB=A6=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/java/example/calculator/model/Calculator.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/example/calculator/model/Calculator.java b/app/src/main/java/example/calculator/model/Calculator.java
index c6819c65b..e61d3a8de 100644
--- a/app/src/main/java/example/calculator/model/Calculator.java
+++ b/app/src/main/java/example/calculator/model/Calculator.java
@@ -9,8 +9,10 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Pattern;
 
 public class Calculator {
+    private static final Pattern OPERATOR_PATTERN = Pattern.compile("[+\\-*/]");
     private Map<String, CalculationOperation> calculationOperations;
     private List<String> calculationHistory;
 
@@ -46,7 +48,7 @@ public double handleCalculation(String[] tokens, String expression) {
         List<Double> operands = new ArrayList<>();
 
         for (String token : tokens) {
-            if (token.matches("[+\\-*/]")) {
+            if (OPERATOR_PATTERN.matcher(token).matches()) {
                 operators.add(token);
             } else {
                 operands.add(Double.parseDouble(token));