diff --git a/.gitignore b/.gitignore new file mode 100644 index 000000000..efcd97cd6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,40 @@ +HELP.md +.gradle +build/ +!gradle/wrapper/gradle-wrapper.jar +!**/src/main/**/build/ +!**/src/test/**/build/ + + +### STS ### +.apt_generated +.classpath +.factorypath +.project +.settings +.springBeans +.sts4-cache +bin/ +!**/src/main/**/bin/ +!**/src/test/**/bin/ + +### IntelliJ IDEA ### +.idea +*.iws +*.iml +*.ipr +.DS_Store +.gradle +out/ +!**/src/main/**/out/ +!**/src/test/**/out/ + +### NetBeans ### +/nbproject/private/ +/nbbuild/ +/dist/ +/nbdist/ +/.nb-gradle/ + +### VS Code ### +.vscode/ \ No newline at end of file diff --git a/build.gradle b/build.gradle new file mode 100644 index 000000000..496fdba25 --- /dev/null +++ b/build.gradle @@ -0,0 +1,23 @@ +plugins { + id 'java' +} + +group 'com.programmers' +version '1.0-SNAPSHOT' + +repositories { + mavenCentral() +} + +dependencies { + testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1' + testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1' + testImplementation 'org.junit.jupiter:junit-jupiter-params:5.8.1' + + testImplementation 'org.assertj:assertj-core:3.22.0' + +} + +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..41d9927a4 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..41dfb8790 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100755 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..bcf30bf6c --- /dev/null +++ b/settings.gradle @@ -0,0 +1,2 @@ +rootProject.name = 'java-calculator' + diff --git a/src/main/java/com/programmers/Main.java b/src/main/java/com/programmers/Main.java new file mode 100644 index 000000000..1ab73228e --- /dev/null +++ b/src/main/java/com/programmers/Main.java @@ -0,0 +1,36 @@ +package com.programmers; + +import com.programmers.core.CalculatorManager; +import com.programmers.core.calculator.Calculator; +import com.programmers.core.calculator.PostfixCalculator; +import com.programmers.core.converter.Converter; +import com.programmers.core.converter.PostfixConverter; +import com.programmers.core.manager.CalculationRequestManager; +import com.programmers.core.manager.CalculatorProcessor; +import com.programmers.core.manager.MenuManager; +import com.programmers.core.manager.ResultPrinter; +import com.programmers.repository.CalculationRepository; +import com.programmers.repository.InMemoryCalculationRepository; +import com.programmers.view.Console; +import com.programmers.view.Input; +import com.programmers.view.Output; +import com.programmers.view.Reader; +import com.programmers.view.Writer; + +public class Main { + public static void main(String[] args) { + CalculationRepository repository = new InMemoryCalculationRepository(); + Input reader = new Reader(); + Output writer = new Writer(); + Console console = new Console(reader, writer); + Converter converter = new PostfixConverter(); + Calculator calculator = new PostfixCalculator(converter); + + MenuManager menuManager = new MenuManager(console); + CalculationRequestManager requestManager = new CalculationRequestManager(console); + CalculatorProcessor calculatorProcessor = new CalculatorProcessor(calculator, repository, console); + ResultPrinter resultPrinter = new ResultPrinter(console); + CalculatorManager calculatorManager = new CalculatorManager(menuManager, requestManager, calculatorProcessor, resultPrinter, repository); + calculatorManager.run(); + } +} \ No newline at end of file diff --git a/src/main/java/com/programmers/core/CalculatorManager.java b/src/main/java/com/programmers/core/CalculatorManager.java new file mode 100644 index 000000000..244631744 --- /dev/null +++ b/src/main/java/com/programmers/core/CalculatorManager.java @@ -0,0 +1,63 @@ +package com.programmers.core; + +import com.programmers.core.data.CalculationRequest; +import com.programmers.core.data.CalculationResult; +import com.programmers.core.manager.CalculationRequestManager; +import com.programmers.core.manager.CalculatorProcessor; +import com.programmers.core.manager.MenuManager; +import com.programmers.core.manager.ResultPrinter; +import com.programmers.repository.CalculationRepository; + +import java.util.List; + +public class CalculatorManager { + + private final MenuManager menuManager; + private final CalculationRequestManager requestManager; + private final CalculatorProcessor calculatorProcessor; + private final ResultPrinter resultPrinter; + private final CalculationRepository repository; + + private static final String VIEW = "1", CALCULATION = "2", EXIT = "3"; + + public CalculatorManager(MenuManager menuManager, CalculationRequestManager requestManager, CalculatorProcessor calculatorProcessor, ResultPrinter resultPrinter, CalculationRepository repository) { + this.menuManager = menuManager; + this.requestManager = requestManager; + this.calculatorProcessor = calculatorProcessor; + this.resultPrinter = resultPrinter; + this.repository = repository; + } + + public void run() { + Boolean power = true; + + while (power) { + switch (menuManager.inputMenu()) { + case VIEW: + findRecord(); + break; + case CALCULATION: + calculatorProcess(); + break; + case EXIT: + menuManager.printExitMessage(); + break; + default: + menuManager.printInvalidMenuSelection(); + } + } + } + + private void findRecord() { + List calculationRecord = repository.findAll(); + menuManager.printCalculationRecords(calculationRecord); + } + + private void calculatorProcess() { + CalculationRequest request = requestManager.createCalculationRequest(); + CalculationResult result = calculatorProcessor.performCalculation(request); + if (result != null) { + resultPrinter.printResult(result.getResult()); + } + } +} diff --git a/src/main/java/com/programmers/core/Operators.java b/src/main/java/com/programmers/core/Operators.java new file mode 100644 index 000000000..bed8317ed --- /dev/null +++ b/src/main/java/com/programmers/core/Operators.java @@ -0,0 +1,37 @@ +package com.programmers.core; + +import java.util.Arrays; +import java.util.function.BiFunction; + +public enum Operators { + + PLUS("+", (num1, num2) -> num1 + num2), + SUBTRACTION("-", (num1, num2) -> num1 - num2), + MULTIPLY("*", (num1, num2) -> num1 * num2), + DIVISION("/", (num1, num2) -> num1 / num2); + + private final String symbol; + private final BiFunction function; + + Operators(String operator, BiFunction function) { + this.symbol = operator; + this.function = function; + } + + public static Operators getOperator(String inputOperator) { + return Arrays.stream(values()) + .filter(operator -> operator.symbol.equals(inputOperator)) + .findFirst() + .orElseThrow(IllegalArgumentException::new); + } + + + public static long calculate(String operator, long num1, long num2) { + return getOperator(operator).function.apply(num1, num2); + } + + public static boolean isOperator(String unCheckedOperator) { + return Arrays.stream(Operators.values()) + .anyMatch(operators -> operators.symbol.equals(unCheckedOperator)); + } +} diff --git a/src/main/java/com/programmers/core/Priority.java b/src/main/java/com/programmers/core/Priority.java new file mode 100644 index 000000000..1e20a1838 --- /dev/null +++ b/src/main/java/com/programmers/core/Priority.java @@ -0,0 +1,33 @@ +package com.programmers.core; + +import java.util.Arrays; +import java.util.Stack; + +public enum Priority { + HIGH(10, new String[]{"/", "*"}), LOW(1, new String[]{"+", "-"}); + + private final int priority; + private final String[] operators; + + Priority(int priority, String[] operators) { + this.priority = priority; + this.operators = operators; + } + + public static int getPriority(String operator) { + return Arrays.stream(Priority.values()) + .filter(symbol -> Arrays.asList(symbol.operators).contains(operator)) + .findFirst() + .orElseThrow(IllegalArgumentException::new) + .priority; + } + + public static boolean isNewOperatorPriorityHigher(String operator, Stack operatorStack) { + return Priority.getPriority(operatorStack.peek()) < Priority.getPriority(operator); + } + + public static boolean isNewOperatorPriorityLower(String operator, Stack operatorStack) { + return Priority.getPriority(operatorStack.peek()) >= Priority.getPriority(operator); + } +} + diff --git a/src/main/java/com/programmers/core/calculator/Calculator.java b/src/main/java/com/programmers/core/calculator/Calculator.java new file mode 100644 index 000000000..e0a301c27 --- /dev/null +++ b/src/main/java/com/programmers/core/calculator/Calculator.java @@ -0,0 +1,8 @@ +package com.programmers.core.calculator; + +import com.programmers.core.data.CalculationRequest; +import com.programmers.core.data.CalculationResult; + +public interface Calculator { + CalculationResult calculate(CalculationRequest request); +} \ No newline at end of file diff --git a/src/main/java/com/programmers/core/calculator/PostfixCalculator.java b/src/main/java/com/programmers/core/calculator/PostfixCalculator.java new file mode 100644 index 000000000..26e44cf8d --- /dev/null +++ b/src/main/java/com/programmers/core/calculator/PostfixCalculator.java @@ -0,0 +1,45 @@ +package com.programmers.core.calculator; + +import com.programmers.core.Operators; +import com.programmers.core.converter.Converter; +import com.programmers.core.data.CalculationRequest; +import com.programmers.core.data.CalculationResult; +import com.programmers.util.StringUtil; + +import java.util.List; +import java.util.Stack; + +public class PostfixCalculator implements Calculator { + private final Converter converter; + + public PostfixCalculator(Converter converter) { + this.converter = converter; + } + + @Override + public CalculationResult calculate(CalculationRequest request) { + String formula = request.getFormula(); + List postfix = converter.convert(request); + long result = calculatePostfixFormula(postfix); + return new CalculationResult(formula, result); + } + + private long calculatePostfixFormula(List postfix) { + Stack stack = new Stack<>(); + for (String token : postfix) { + if (StringUtil.isNumber(token)) { + stack.push(Long.parseLong(token)); + } else { + calculateTop(stack, token); + } + } + + return stack.pop(); + } + + private void calculateTop(Stack stack, String token) { + Long num2 = stack.pop(); + Long num1 = stack.pop(); + stack.push(Operators.calculate(token, num1, num2)); + } +} diff --git a/src/main/java/com/programmers/core/converter/Converter.java b/src/main/java/com/programmers/core/converter/Converter.java new file mode 100644 index 000000000..22e177bbb --- /dev/null +++ b/src/main/java/com/programmers/core/converter/Converter.java @@ -0,0 +1,9 @@ +package com.programmers.core.converter; + +import com.programmers.core.data.CalculationRequest; + +import java.util.List; + +public interface Converter { + List convert(CalculationRequest request); +} diff --git a/src/main/java/com/programmers/core/converter/PostfixConverter.java b/src/main/java/com/programmers/core/converter/PostfixConverter.java new file mode 100644 index 000000000..bbc39eee2 --- /dev/null +++ b/src/main/java/com/programmers/core/converter/PostfixConverter.java @@ -0,0 +1,64 @@ +package com.programmers.core.converter; + +import com.programmers.core.Operators; +import com.programmers.core.Priority; +import com.programmers.core.data.CalculationRequest; +import com.programmers.util.StringUtil; +import com.programmers.util.Validator; + +import java.util.ArrayList; +import java.util.List; +import java.util.Stack; + +public class PostfixConverter implements Converter { + private static final String SEPARATOR = " "; + + @Override + public List convert(CalculationRequest request) { + String formula = request.getFormula(); + Validator.checkNull(formula); + + String[] splitFormula = formula.split(SEPARATOR); + Validator.checkEmpty(splitFormula); + + List postfix = new ArrayList<>(); + Stack stack = new Stack<>(); + + for (int position = 0; position < splitFormula.length; position++) { + String eachFormula = splitFormula[position]; + + if (Validator.isOperatorCheck(position)) { + putOperator(eachFormula, postfix, stack); + } else { + putOperand(eachFormula, postfix); + } + } + while (!stack.isEmpty()) { + postfix.add(stack.pop()); + } + + return postfix; + } + + private void putOperator(String operator, List postfix, Stack operatorStack) { + if (!Operators.isOperator(operator)) ; + + if (operatorStack.isEmpty() || Priority.isNewOperatorPriorityHigher(operator, operatorStack)) { + operatorStack.push(operator); + return; + } + + while (!operatorStack.isEmpty() && Priority.isNewOperatorPriorityLower(operator, operatorStack)) { + postfix.add(operatorStack.pop()); + } + + operatorStack.push(operator); + } + + private void putOperand(String operand, List postfix) { + if (!StringUtil.isNumber(operand)) { + throw new NumberFormatException(); + } + postfix.add(operand); + } +} \ No newline at end of file diff --git a/src/main/java/com/programmers/core/data/CalculationRequest.java b/src/main/java/com/programmers/core/data/CalculationRequest.java new file mode 100644 index 000000000..c1c19edd3 --- /dev/null +++ b/src/main/java/com/programmers/core/data/CalculationRequest.java @@ -0,0 +1,15 @@ +package com.programmers.core.data; + +public class CalculationRequest { + + private final String formula; + + public CalculationRequest(String formula) { + this.formula = formula; + } + + public String getFormula() { + return formula; + } + +} diff --git a/src/main/java/com/programmers/core/data/CalculationResult.java b/src/main/java/com/programmers/core/data/CalculationResult.java new file mode 100644 index 000000000..8958e6b15 --- /dev/null +++ b/src/main/java/com/programmers/core/data/CalculationResult.java @@ -0,0 +1,20 @@ +package com.programmers.core.data; + +public class CalculationResult { + private String formula; + private final long result; + + public CalculationResult(String formula, long result) { + this.formula = formula; + this.result = result; + } + + public long getResult() { + return result; + } + + @Override + public String toString() { + return formula + " = " + result; + } +} diff --git a/src/main/java/com/programmers/core/manager/CalculationRequestManager.java b/src/main/java/com/programmers/core/manager/CalculationRequestManager.java new file mode 100644 index 000000000..c40a82982 --- /dev/null +++ b/src/main/java/com/programmers/core/manager/CalculationRequestManager.java @@ -0,0 +1,18 @@ +package com.programmers.core.manager; + +import com.programmers.core.data.CalculationRequest; +import com.programmers.view.Console; + +public class CalculationRequestManager { + private final Console console; + + public CalculationRequestManager(Console console) { + this.console = console; + } + + public CalculationRequest createCalculationRequest() { + String formula = console.inputFormula(); + return new CalculationRequest(formula); + } +} + diff --git a/src/main/java/com/programmers/core/manager/CalculatorProcessor.java b/src/main/java/com/programmers/core/manager/CalculatorProcessor.java new file mode 100644 index 000000000..71f5df95a --- /dev/null +++ b/src/main/java/com/programmers/core/manager/CalculatorProcessor.java @@ -0,0 +1,36 @@ +package com.programmers.core.manager; + +import com.programmers.core.calculator.Calculator; +import com.programmers.core.data.CalculationRequest; +import com.programmers.core.data.CalculationResult; +import com.programmers.error.ErrorMessages; +import com.programmers.repository.CalculationRepository; +import com.programmers.view.Console; + +public class CalculatorProcessor { + private final Calculator calculator; + private final CalculationRepository repository; + private final Console console; + + public CalculatorProcessor(Calculator calculator, CalculationRepository repository, Console console) { + this.calculator = calculator; + this.repository = repository; + this.console = console; + } + + public CalculationResult performCalculation(CalculationRequest request) { + try { + CalculationResult result = calculator.calculate(request); + repository.save(result); + return result; + } catch (NumberFormatException e) { + console.print(ErrorMessages.getOperandIsNotANumberMsg()); + } catch (IllegalArgumentException e) { + console.print(ErrorMessages.getInvalidOperatorInputMsg()); + } catch (ArithmeticException e) { + console.print(ErrorMessages.getEnterZeroForDivisionMsg()); + } + return null; + } +} + diff --git a/src/main/java/com/programmers/core/manager/MenuManager.java b/src/main/java/com/programmers/core/manager/MenuManager.java new file mode 100644 index 000000000..bf1583c45 --- /dev/null +++ b/src/main/java/com/programmers/core/manager/MenuManager.java @@ -0,0 +1,37 @@ +package com.programmers.core.manager; + +import com.programmers.core.data.CalculationResult; +import com.programmers.error.ErrorMessages; +import com.programmers.view.Console; + +import java.util.List; + +public class MenuManager { + + private final Console console; + + public MenuManager(Console console) { + this.console = console; + } + + public String inputMenu() { + return console.inputMenu(); + } + + public void printInvalidMenuSelection() { + console.print(ErrorMessages.getInvalidMenuSelectionMsg()); + } + + public void printExitMessage() { + console.print("프로그램을 종료합니다."); + } + + public void printCalculationRecords(List calculationRecord) { + if (calculationRecord.isEmpty()) { + console.print(ErrorMessages.getNoCalculationRecordsMsg()); + } else { + console.printList(calculationRecord); + } + } +} + diff --git a/src/main/java/com/programmers/core/manager/ResultPrinter.java b/src/main/java/com/programmers/core/manager/ResultPrinter.java new file mode 100644 index 000000000..a7d6a819e --- /dev/null +++ b/src/main/java/com/programmers/core/manager/ResultPrinter.java @@ -0,0 +1,15 @@ +package com.programmers.core.manager; + +import com.programmers.view.Console; + +public class ResultPrinter { + private final Console console; + + public ResultPrinter(Console console) { + this.console = console; + } + + public void printResult(long result) { + console.print(result); + } +} diff --git a/src/main/java/com/programmers/error/ErrorMessages.java b/src/main/java/com/programmers/error/ErrorMessages.java new file mode 100644 index 000000000..a4562b560 --- /dev/null +++ b/src/main/java/com/programmers/error/ErrorMessages.java @@ -0,0 +1,34 @@ +package com.programmers.error; + +public final class ErrorMessages { + + private static final String INVALID_MENU_SELECTION = "메뉴를 잘못 선택하셨습니다. 메뉴는 1,2,3 중에서 선택 가능합니다."; + private static final String ENTER_ZERO_FOR_DIVISION = "0으로는 나눌 수 없습니다. 0이 아닌 다른 숫자를 사용해 주세요."; + private static final String INVALID_OPERATOR_INPUT = "잘못된 수식입니다. +, -, *, / 연산만 가능합니다."; + private static final String NO_CALCULATION_RECORDS = "계산 기록이 없습니다. 먼저 계산 결과를 얻은 후 사용하세요."; + private static final String OPERAND_IS_NOT_A_NUMBER = "피연산자가 숫자가 아닙니다. 숫자를 입력해 주세요."; + + private ErrorMessages() { + throw new RuntimeException("ErrorMsg를 인스턴스화 하지 마세요"); + } + + public static String getInvalidMenuSelectionMsg() { + return INVALID_MENU_SELECTION; + } + + public static String getEnterZeroForDivisionMsg() { + return ENTER_ZERO_FOR_DIVISION; + } + + public static String getInvalidOperatorInputMsg() { + return INVALID_OPERATOR_INPUT; + } + + public static String getNoCalculationRecordsMsg() { + return NO_CALCULATION_RECORDS; + } + + public static String getOperandIsNotANumberMsg() { + return OPERAND_IS_NOT_A_NUMBER; + } +} diff --git a/src/main/java/com/programmers/repository/CalculationRepository.java b/src/main/java/com/programmers/repository/CalculationRepository.java new file mode 100644 index 000000000..2da57dd86 --- /dev/null +++ b/src/main/java/com/programmers/repository/CalculationRepository.java @@ -0,0 +1,12 @@ +package com.programmers.repository; + +import com.programmers.core.data.CalculationResult; + +import java.util.List; + +public interface CalculationRepository { + void save(CalculationResult result); + + List findAll(); + +} diff --git a/src/main/java/com/programmers/repository/InMemoryCalculationRepository.java b/src/main/java/com/programmers/repository/InMemoryCalculationRepository.java new file mode 100644 index 000000000..b521c57eb --- /dev/null +++ b/src/main/java/com/programmers/repository/InMemoryCalculationRepository.java @@ -0,0 +1,24 @@ +package com.programmers.repository; + +import com.programmers.core.data.CalculationResult; + +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +public class InMemoryCalculationRepository implements CalculationRepository { + private static final Map repository = new HashMap<>(); + private static long id = 0L; + + @Override + public void save(CalculationResult result) { + repository.put(++id, result); + } + + @Override + public List findAll() { + return new ArrayList<>(repository.values()); + } + +} diff --git a/src/main/java/com/programmers/util/StringUtil.java b/src/main/java/com/programmers/util/StringUtil.java new file mode 100644 index 000000000..810b15219 --- /dev/null +++ b/src/main/java/com/programmers/util/StringUtil.java @@ -0,0 +1,17 @@ +package com.programmers.util; + +public final class StringUtil { + private StringUtil() { + throw new AssertionError("StringUtil 클래스는 인스턴스화 할 수 없습니다."); + } + + private static final String NUMBER_REGEX = "-?\\d+(\\.\\d+)?"; + + public static boolean isNumber(String unCheckedToken) { + if (unCheckedToken == null) { + throw new IllegalArgumentException(); + } + + return unCheckedToken.matches(NUMBER_REGEX); + } +} diff --git a/src/main/java/com/programmers/util/Validator.java b/src/main/java/com/programmers/util/Validator.java new file mode 100644 index 000000000..a453f1fda --- /dev/null +++ b/src/main/java/com/programmers/util/Validator.java @@ -0,0 +1,31 @@ +package com.programmers.util; + +public final class Validator { + private Validator() { + throw new AssertionError("Validator 클래스는 인스턴스화 할 수 없습니다."); + } + + public static boolean isOperatorCheck(int position) { + return (position + 1) % 2 == 0; + } + + public static void checkEmpty(String[] splitFormula) { + if (isEmpty(splitFormula)) { + throw new IllegalArgumentException(); + } + } + + private static boolean isEmpty(String[] list) { + return list != null && list.length == 0; + } + + public static void checkNull(String input) { + if (isNull(input)) { + throw new IllegalArgumentException(); + } + } + + private static boolean isNull(String input) { + return input == null; + } +} diff --git a/src/main/java/com/programmers/view/Console.java b/src/main/java/com/programmers/view/Console.java new file mode 100644 index 000000000..dc0425827 --- /dev/null +++ b/src/main/java/com/programmers/view/Console.java @@ -0,0 +1,45 @@ +package com.programmers.view; + +import com.programmers.core.data.CalculationResult; + +import java.util.List; + +public class Console { + private final Input input; + private final Output output; + + private static final String VIEW_MESSAGE = "1. 조회"; + private static final String CALCULATION_MESSAGE = "2. 계산"; + private static final String EXITING_MESSAGE = "3. 종료"; + private static final String CHOICE = "선택 : "; + + public Console(Input input, Output output) { + this.input = input; + this.output = output; + } + + public String inputMenu() { + output.print(VIEW_MESSAGE); + output.print(CALCULATION_MESSAGE); + output.print(EXITING_MESSAGE); + output.print(CHOICE); + return input.read(); + } + + public String inputFormula() { + return input.read(); + } + + public void printList(List record) { + output.print(record); + } + + public void print(String message) { + output.print(message); + } + + public void print(long result) { + output.print(result); + } +} + diff --git a/src/main/java/com/programmers/view/Input.java b/src/main/java/com/programmers/view/Input.java new file mode 100644 index 000000000..b1a057140 --- /dev/null +++ b/src/main/java/com/programmers/view/Input.java @@ -0,0 +1,5 @@ +package com.programmers.view; + +public interface Input { + String read(); +} \ No newline at end of file diff --git a/src/main/java/com/programmers/view/Output.java b/src/main/java/com/programmers/view/Output.java new file mode 100644 index 000000000..115b1620a --- /dev/null +++ b/src/main/java/com/programmers/view/Output.java @@ -0,0 +1,15 @@ +package com.programmers.view; + +import com.programmers.core.data.CalculationResult; + +import java.util.List; + +public interface Output { + + void print(String message); + + void print(long result); + + void print(List record); + +} diff --git a/src/main/java/com/programmers/view/Reader.java b/src/main/java/com/programmers/view/Reader.java new file mode 100644 index 000000000..9c2cd276f --- /dev/null +++ b/src/main/java/com/programmers/view/Reader.java @@ -0,0 +1,16 @@ +package com.programmers.view; + +import java.util.Scanner; + +public class Reader implements Input { + private final Scanner scanner; + + public Reader() { + this.scanner = new Scanner(System.in); + } + + @Override + public String read() { + return scanner.nextLine().trim(); + } +} diff --git a/src/main/java/com/programmers/view/Writer.java b/src/main/java/com/programmers/view/Writer.java new file mode 100644 index 000000000..61fe9dc1f --- /dev/null +++ b/src/main/java/com/programmers/view/Writer.java @@ -0,0 +1,27 @@ +package com.programmers.view; + +import com.programmers.core.data.CalculationResult; + +import java.util.List; + +public class Writer implements Output { + + @Override + public void print(String message) { + System.out.println(message); + } + + @Override + public void print(long result) { + System.out.println(); + System.out.println(result); + System.out.println(); + } + + @Override + public void print(List record) { + System.out.println(); + record.forEach(System.out::println); + System.out.println(); + } +} diff --git a/src/test/java/com/programmers/CalculatorTest.java b/src/test/java/com/programmers/CalculatorTest.java new file mode 100644 index 000000000..0dcee3a3c --- /dev/null +++ b/src/test/java/com/programmers/CalculatorTest.java @@ -0,0 +1,122 @@ +package com.programmers; + +import com.programmers.core.calculator.PostfixCalculator; +import com.programmers.core.converter.Converter; +import com.programmers.core.converter.PostfixConverter; +import com.programmers.core.data.CalculationRequest; +import com.programmers.core.data.CalculationResult; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import static org.assertj.core.api.Assertions.assertThat; +import static org.junit.jupiter.api.Assertions.assertThrows; + +public class CalculatorTest { + + private PostfixCalculator calculator; + + @BeforeEach + void setUp() { + Converter converter = new PostfixConverter(); + calculator = new PostfixCalculator(converter); + } + + @Test + @DisplayName("더하기 테스트") + void addTest() throws Exception { + //given + CalculationRequest request = new CalculationRequest("1 + 2"); + CalculationResult expected = new CalculationResult(request.getFormula(), 3); + + //when + CalculationResult result = calculator.calculate(request); + + //then + assertThat(result.getResult()).isEqualTo(expected.getResult()); + } + + @Test + @DisplayName("빼기 테스트") + void subtractionTest() throws Exception { + //given + CalculationRequest request = new CalculationRequest("1 - 2"); + CalculationResult expected = new CalculationResult(request.getFormula(), -1); + + //when + CalculationResult result = calculator.calculate(request); + + //then + assertThat(result.getResult()).isEqualTo(expected.getResult()); + } + + + @Test + @DisplayName("곱하기 테스트") + void multiplyTest() throws Exception { + //given + CalculationRequest request = new CalculationRequest("2 * 2"); + CalculationResult expected = new CalculationResult(request.getFormula(), 4); + + //when + CalculationResult result = calculator.calculate(request); + + //then + assertThat(result.getResult()).isEqualTo(expected.getResult()); + } + + + @Test + @DisplayName("나누기 테스트") + void divideTest() throws Exception { + //given + CalculationRequest request = new CalculationRequest("2 / 2"); + CalculationResult expected = new CalculationResult(request.getFormula(), 1); + + //when + CalculationResult result = calculator.calculate(request); + + //then + assertThat(result.getResult()).isEqualTo(expected.getResult()); + } + + @Test + @DisplayName("계산 실패_잘못된 수식") + public void testInvalidFormula() { + CalculationRequest request = new CalculationRequest("3 4 + +"); + + assertThrows(IllegalArgumentException.class, () -> calculator.calculate(request)); + } + + @Test + @DisplayName("계산 실패_빈 수식") + void testEmptyFormula() throws Exception { + CalculationRequest request = new CalculationRequest(""); + + assertThrows(IllegalArgumentException.class, () -> calculator.calculate(request)); + } + + @Test + @DisplayName("계산 실패_null값") + void testNullFormula() throws Exception { + CalculationRequest request = new CalculationRequest(null); + + assertThrows(IllegalArgumentException.class, () -> calculator.calculate(request)); + } + + @Test + @DisplayName("계산 실패_피연산자가 아닌 문자열 입력") + void testInvalidOperand() throws Exception { + CalculationRequest request = new CalculationRequest("3 + a"); + + assertThrows(NumberFormatException.class, () -> calculator.calculate(request)); + } + + @Test + @DisplayName("계산 실패_0으로 나누는 경우") + void testDivideByZero() throws Exception { + CalculationRequest request = new CalculationRequest("3 / 0"); + + assertThrows(ArithmeticException.class, () -> calculator.calculate(request)); + } +} diff --git a/src/test/java/com/programmers/PostfixConverterTest.java b/src/test/java/com/programmers/PostfixConverterTest.java new file mode 100644 index 000000000..f181d6f13 --- /dev/null +++ b/src/test/java/com/programmers/PostfixConverterTest.java @@ -0,0 +1,68 @@ +package com.programmers; + +import com.programmers.core.converter.PostfixConverter; +import com.programmers.core.data.CalculationRequest; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import java.util.List; + +import static org.assertj.core.api.Assertions.assertThat; +import static org.junit.jupiter.api.Assertions.assertThrows; + +public class PostfixConverterTest { + + private PostfixConverter converter; + + @BeforeEach + void setUp() { + converter = new PostfixConverter(); + } + + @Test + @DisplayName("후위 표기식 변환 성공 테스트") + void validFormula() { + + //given + CalculationRequest request1 = new CalculationRequest("1 + 1 * 2"); + CalculationRequest request2 = new CalculationRequest("2 * 2 - 2 / 2"); + + //when + List postfixFormula1 = converter.convert(request1); + List postfixFormula2 = converter.convert(request2); + + //then + assertThat(postfixFormula1).containsExactly("1", "1", "2", "*", "+"); + assertThat(postfixFormula2).containsExactly("2", "2", "*", "2", "2", "/", "-"); + } + + @Test + @DisplayName("후위 표기식 변환 실패 테스트_빈 수식") + void emptyFormula() { + CalculationRequest request = new CalculationRequest(""); + assertThrows(IllegalArgumentException.class, () -> converter.convert(request)); + } + + @Test + @DisplayName("후위 표기식 변환 실패 테스트_null") + void nullFormula() { + CalculationRequest request = new CalculationRequest(null); + assertThrows(IllegalArgumentException.class, () -> converter.convert(request)); + } + + @Test + @DisplayName("후위 표기식 변환 실패 테스트_잘못된 수식") + void invalidFormula() { + CalculationRequest request = new CalculationRequest("1 + a"); + assertThrows(IllegalArgumentException.class, () -> converter.convert(request)); + } + + @Test + @DisplayName("후위 표기식 변환 실패 테스트_완성되지 않은 식") + void singleFormula() { + CalculationRequest request = new CalculationRequest("+"); + assertThrows(IllegalArgumentException.class, () -> converter.convert(request)); + } +} + diff --git a/src/test/java/com/programmers/core/PriorityTest.java b/src/test/java/com/programmers/core/PriorityTest.java new file mode 100644 index 000000000..9e394cc66 --- /dev/null +++ b/src/test/java/com/programmers/core/PriorityTest.java @@ -0,0 +1,62 @@ +package com.programmers.core; + +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import java.util.Stack; + +import static com.programmers.core.Priority.getPriority; +import static com.programmers.core.Priority.isNewOperatorPriorityHigher; +import static com.programmers.core.Priority.isNewOperatorPriorityLower; +import static org.assertj.core.api.Assertions.assertThat; +import static org.junit.jupiter.api.Assertions.assertFalse; +import static org.junit.jupiter.api.Assertions.assertThrows; +import static org.junit.jupiter.api.Assertions.assertTrue; + +class PriorityTest { + + @Test + @DisplayName("올바른 수식의 우선순위 확인") + void validOperator() { + assertThat(getPriority("/")).isEqualTo(10); + assertThat(getPriority("*")).isEqualTo(10); + assertThat(getPriority("+")).isEqualTo(1); + assertThat(getPriority("-")).isEqualTo(1); + } + + @Test + @DisplayName("잘못된 수식 입력") + void invalidOperator() { + assertThrows(IllegalArgumentException.class, () -> Priority.getPriority("@")); + assertThrows(IllegalArgumentException.class, () -> Priority.getPriority("abc")); + assertThrows(IllegalArgumentException.class, () -> Priority.getPriority("")); + assertThrows(IllegalArgumentException.class, () -> Priority.getPriority(null)); + } + + @Test + @DisplayName("우선순위가 operator > stack 상위") + void withHigherPriority() { + Stack operatorStack = new Stack<>(); + operatorStack.push("+"); + + assertTrue(isNewOperatorPriorityHigher("/", operatorStack)); + assertTrue(isNewOperatorPriorityHigher("*", operatorStack)); + + assertFalse(isNewOperatorPriorityLower("/", operatorStack)); + assertFalse(isNewOperatorPriorityLower("*", operatorStack)); + } + + + @Test + @DisplayName("우선순위가 operator < stack 상위") + void withLowerPriority() { + Stack operatorStack = new Stack<>(); + operatorStack.push("*"); + + assertTrue(isNewOperatorPriorityLower("-", operatorStack)); + assertTrue(isNewOperatorPriorityLower("+", operatorStack)); + + assertFalse(isNewOperatorPriorityHigher("-", operatorStack)); + assertFalse(isNewOperatorPriorityHigher("+", operatorStack)); + } +} \ No newline at end of file diff --git a/src/test/java/com/programmers/repository/InMemoryCalculationRepositoryTest.java b/src/test/java/com/programmers/repository/InMemoryCalculationRepositoryTest.java new file mode 100644 index 000000000..7c965f607 --- /dev/null +++ b/src/test/java/com/programmers/repository/InMemoryCalculationRepositoryTest.java @@ -0,0 +1,29 @@ +package com.programmers.repository; + +import com.programmers.core.data.CalculationResult; +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import java.util.List; + +import static org.assertj.core.api.Assertions.assertThat; + +class InMemoryCalculationRepositoryTest { + + CalculationRepository repository = new InMemoryCalculationRepository(); + + @Test + @DisplayName("계산이력 저장 테스트") + void 계산이력저장() throws Exception { + //given + CalculationResult[] results = {new CalculationResult("1 + 2 * 3 ", 7), new CalculationResult("2 + 4 * 3 - 5 * 2 ", 4)}; + //when + for (CalculationResult result : results) { + repository.save(result); + } + //then + List record = repository.findAll(); + assertThat(record.size()).isEqualTo(results.length); + assertThat(record).containsExactlyInAnyOrder(results); + } +} \ No newline at end of file diff --git a/src/test/java/com/programmers/util/StringUtilTest.java b/src/test/java/com/programmers/util/StringUtilTest.java new file mode 100644 index 000000000..c1cd2a765 --- /dev/null +++ b/src/test/java/com/programmers/util/StringUtilTest.java @@ -0,0 +1,33 @@ +package com.programmers.util; + +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import static org.junit.jupiter.api.Assertions.assertFalse; +import static org.junit.jupiter.api.Assertions.assertThrows; +import static org.junit.jupiter.api.Assertions.assertTrue; + +class StringUtilTest { + + @Test + @DisplayName("숫자인지 확인") + void testValidNumber() throws Exception { + assertTrue(StringUtil.isNumber("123")); + assertTrue(StringUtil.isNumber("0")); + } + + @Test + @DisplayName("숫자외 형식") + void testInvalidNumber() throws Exception { + assertFalse(StringUtil.isNumber("asb")); + assertFalse(StringUtil.isNumber("!@#$")); + assertFalse(StringUtil.isNumber("-")); + assertFalse(StringUtil.isNumber(".")); + } + + @Test + @DisplayName("null 형식") + void nullInput() throws Exception { + assertThrows(IllegalArgumentException.class, () -> StringUtil.isNumber(null)); + } +} \ No newline at end of file diff --git a/src/test/java/com/programmers/util/ValidatorTest.java b/src/test/java/com/programmers/util/ValidatorTest.java new file mode 100644 index 000000000..adbea2d95 --- /dev/null +++ b/src/test/java/com/programmers/util/ValidatorTest.java @@ -0,0 +1,35 @@ +package com.programmers.util; + +import org.junit.jupiter.api.Assertions; +import org.junit.jupiter.api.DisplayName; +import org.junit.jupiter.api.Test; + +import static org.junit.jupiter.api.Assertions.assertDoesNotThrow; +import static org.junit.jupiter.api.Assertions.assertThrows; + +class ValidatorTest { + + @Test + @DisplayName("올바른 위치에 연산자 유무 체크") + void testOperatorPositionCheck() throws Exception { + Assertions.assertTrue(Validator.isOperatorCheck(1)); + Assertions.assertTrue(Validator.isOperatorCheck(3)); + + Assertions.assertFalse(Validator.isOperatorCheck(0)); + Assertions.assertFalse(Validator.isOperatorCheck(2)); + } + + @Test + @DisplayName("빈칸 체크") + void testCheckEmpty() throws Exception { + assertThrows(IllegalArgumentException.class, () -> Validator.checkEmpty(new String[0])); + + assertDoesNotThrow(() -> Validator.checkEmpty(new String[]{"1,", "+", "2"})); + } + @Test + @DisplayName("null 체크") + void testCheckNull() throws Exception { + assertThrows(IllegalArgumentException.class, () -> Validator.checkNull(null)); + assertDoesNotThrow(() -> Validator.checkNull("1 + 2")); + } +} \ No newline at end of file