From 44937d605cf45ddf76a9adbe941c7058d8d17e8d Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 17:25:56 +0900
Subject: [PATCH 01/10] Initialize project by making CalculatorApp

---
 src/main/java/CalculatorApp.java | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 src/main/java/CalculatorApp.java

diff --git a/src/main/java/CalculatorApp.java b/src/main/java/CalculatorApp.java
new file mode 100644
index 0000000..5312cd8
--- /dev/null
+++ b/src/main/java/CalculatorApp.java
@@ -0,0 +1,5 @@
+public class CalculatorApp {
+    public static void main(String[] args) {
+
+    }
+}

From 13f63cfc681b33d17f002011f25b14732e1c4d0b Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 17:31:56 +0900
Subject: [PATCH 02/10] Add class and functions to get input

Get input to App from InputView
Create InputView and method getInputs to return user Inputs
---
 src/main/java/CalculatorApp.java | 1 +
 src/main/java/InputView.java     | 9 +++++++++
 2 files changed, 10 insertions(+)
 create mode 100644 src/main/java/InputView.java

diff --git a/src/main/java/CalculatorApp.java b/src/main/java/CalculatorApp.java
index 5312cd8..5feb517 100644
--- a/src/main/java/CalculatorApp.java
+++ b/src/main/java/CalculatorApp.java
@@ -1,5 +1,6 @@
 public class CalculatorApp {
     public static void main(String[] args) {
+        String input = InputView.getInputs();
 
     }
 }
diff --git a/src/main/java/InputView.java b/src/main/java/InputView.java
new file mode 100644
index 0000000..a16d9be
--- /dev/null
+++ b/src/main/java/InputView.java
@@ -0,0 +1,9 @@
+import java.util.Scanner;
+
+public class InputView {
+    private static Scanner scanner = new Scanner(System.in);
+
+    public static String getInputs() {
+        return scanner.nextLine();
+    }
+}

From 199428bb79078472c5beed7aace19a0dc9a28e91 Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 17:40:24 +0900
Subject: [PATCH 03/10] Add Deciferer to extract elements

Add Deciferer Class and extractElements Method
---
 src/main/java/CalculatorApp.java | 2 +-
 src/main/java/Deciferer.java     | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/Deciferer.java

diff --git a/src/main/java/CalculatorApp.java b/src/main/java/CalculatorApp.java
index 5feb517..ba5028b 100644
--- a/src/main/java/CalculatorApp.java
+++ b/src/main/java/CalculatorApp.java
@@ -1,6 +1,6 @@
 public class CalculatorApp {
     public static void main(String[] args) {
         String input = InputView.getInputs();
-
+        String[] inputs = Deciferer.extractElements(input);
     }
 }
diff --git a/src/main/java/Deciferer.java b/src/main/java/Deciferer.java
new file mode 100644
index 0000000..4a88b91
--- /dev/null
+++ b/src/main/java/Deciferer.java
@@ -0,0 +1,6 @@
+public class Deciferer {
+
+    public static String[] extractElements (String inputs) {
+        return new String[] {"a"};
+    }
+}

From 3beea6fde62b3953a31d5fdf7f96d3db8fca7bf8 Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 17:47:13 +0900
Subject: [PATCH 04/10] Add DecifererTest for test

---
 src/test/java/DecifererTest.java | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 src/test/java/DecifererTest.java

diff --git a/src/test/java/DecifererTest.java b/src/test/java/DecifererTest.java
new file mode 100644
index 0000000..438140f
--- /dev/null
+++ b/src/test/java/DecifererTest.java
@@ -0,0 +1,17 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class DecifererTest {
+    private Deciferer deciferer;
+    @BeforeEach
+    void setUp() {
+        deciferer = new Deciferer();
+    }
+
+    @Test
+    public void extractElements() {
+        assertThat(deciferer.extractElements("3:3:3")).isEqualTo(new String[] {"3","3","3"});
+    }
+}

From aad49c2f8db047c1efaebb268a979f9e821c5287 Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 20:05:40 +0900
Subject: [PATCH 05/10] Finish Deciferer.extractElements and its test

---
 src/main/java/Deciferer.java     | 18 ++++++++++++++++--
 src/test/java/DecifererTest.java |  5 ++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/main/java/Deciferer.java b/src/main/java/Deciferer.java
index 4a88b91..f41be30 100644
--- a/src/main/java/Deciferer.java
+++ b/src/main/java/Deciferer.java
@@ -1,6 +1,20 @@
+import java.lang.reflect.Array;
+import java.util.Arrays;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class Deciferer {
 
-    public static String[] extractElements (String inputs) {
-        return new String[] {"a"};
+    public static String[] extractElements (String input) {
+        Pattern pattern = Pattern.compile("(//([^\\d])\\\\n)(\\p{Alnum}+)");
+        Matcher matcher = pattern.matcher(input);
+
+        if (matcher.matches()) {
+            String customSeparator = matcher.group(2);
+            String otherString = matcher.group(3);
+            return otherString.split(customSeparator);
+        }
+
+        return input.split(",|;");
     }
 }
diff --git a/src/test/java/DecifererTest.java b/src/test/java/DecifererTest.java
index 438140f..88d3a18 100644
--- a/src/test/java/DecifererTest.java
+++ b/src/test/java/DecifererTest.java
@@ -12,6 +12,9 @@ void setUp() {
 
     @Test
     public void extractElements() {
-        assertThat(deciferer.extractElements("3:3:3")).isEqualTo(new String[] {"3","3","3"});
+        assertThat(deciferer.extractElements("3;3;3")).isEqualTo(new String[] {"3","3","3"});
+        assertThat(deciferer.extractElements("3,3;3")).isEqualTo(new String[] {"3","3","3"});
+        assertThat(deciferer.extractElements("//a\\n3a3a3")).isEqualTo(new String[] {"3","3","3"});
+        assertThat(deciferer.extractElements("3,3;3")).isEqualTo(new String[] {"3","3","3"});
     }
 }

From 423d5ec26318e958d4e977555357e5d98bdc2bcc Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Tue, 16 Jun 2020 20:14:34 +0900
Subject: [PATCH 06/10] Add Calculator CalculatorTest edit CalulatorApp

---
 src/main/java/Calculator.java     |  7 +++++++
 src/main/java/CalculatorApp.java  |  1 +
 src/test/java/CalculatorTest.java | 17 +++++++++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 src/main/java/Calculator.java
 create mode 100644 src/test/java/CalculatorTest.java

diff --git a/src/main/java/Calculator.java b/src/main/java/Calculator.java
new file mode 100644
index 0000000..2472812
--- /dev/null
+++ b/src/main/java/Calculator.java
@@ -0,0 +1,7 @@
+import java.util.stream.Stream;
+
+public class Calculator {
+    public static int getSum(String[] inputs) {
+        return Stream.of(inputs).mapToInt(x-> Integer.parseInt(x)).reduce((a,b)-> a+b).getAsInt();
+    }
+}
diff --git a/src/main/java/CalculatorApp.java b/src/main/java/CalculatorApp.java
index ba5028b..dc36117 100644
--- a/src/main/java/CalculatorApp.java
+++ b/src/main/java/CalculatorApp.java
@@ -2,5 +2,6 @@ public class CalculatorApp {
     public static void main(String[] args) {
         String input = InputView.getInputs();
         String[] inputs = Deciferer.extractElements(input);
+        int sum = Calculator.getSum(inputs);
     }
 }
diff --git a/src/test/java/CalculatorTest.java b/src/test/java/CalculatorTest.java
new file mode 100644
index 0000000..1ec4729
--- /dev/null
+++ b/src/test/java/CalculatorTest.java
@@ -0,0 +1,17 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CalculatorTest {
+    private Calculator calculator;
+    @BeforeEach
+    void setUp() {
+        calculator = new Calculator();
+    }
+
+    @Test
+    public void getSum() {
+        assertThat(calculator.getSum(new String[] {"1","2","3"})).isEqualTo(6);
+    }
+}

From 0bc0a3fee1ac6d57c86d26f5ac5165be3c1cd8ee Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Wed, 17 Jun 2020 12:54:40 +0900
Subject: [PATCH 07/10] Create OutputView

---
 src/main/java/CalculatorApp.java | 1 +
 src/main/java/OutputView.java    | 5 +++++
 2 files changed, 6 insertions(+)
 create mode 100644 src/main/java/OutputView.java

diff --git a/src/main/java/CalculatorApp.java b/src/main/java/CalculatorApp.java
index dc36117..f104eee 100644
--- a/src/main/java/CalculatorApp.java
+++ b/src/main/java/CalculatorApp.java
@@ -3,5 +3,6 @@ public static void main(String[] args) {
         String input = InputView.getInputs();
         String[] inputs = Deciferer.extractElements(input);
         int sum = Calculator.getSum(inputs);
+        OutputView.sumResult(sum);
     }
 }
diff --git a/src/main/java/OutputView.java b/src/main/java/OutputView.java
new file mode 100644
index 0000000..ec2e020
--- /dev/null
+++ b/src/main/java/OutputView.java
@@ -0,0 +1,5 @@
+public class OutputView {
+    public static void sumResult(int sum) {
+        System.out.println(sum);
+    }
+}

From 1d7350e132494beda0e4ddd73a586c6dd111993d Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Wed, 17 Jun 2020 13:28:18 +0900
Subject: [PATCH 08/10] Add Validator to validate input

---
 src/main/java/ArithmeticOperator.java     |  4 ++++
 src/main/java/Validator.java              |  8 ++++++++
 src/test/java/ArithmeticOperatorTest.java |  4 ++++
 src/test/java/ValidatorTest.java          | 20 ++++++++++++++++++++
 4 files changed, 36 insertions(+)
 create mode 100644 src/main/java/ArithmeticOperator.java
 create mode 100644 src/main/java/Validator.java
 create mode 100644 src/test/java/ArithmeticOperatorTest.java
 create mode 100644 src/test/java/ValidatorTest.java

diff --git a/src/main/java/ArithmeticOperator.java b/src/main/java/ArithmeticOperator.java
new file mode 100644
index 0000000..576cf72
--- /dev/null
+++ b/src/main/java/ArithmeticOperator.java
@@ -0,0 +1,4 @@
+package PACKAGE_NAME;
+
+public class ArithmeticOperator {
+}
diff --git a/src/main/java/Validator.java b/src/main/java/Validator.java
new file mode 100644
index 0000000..8b9f516
--- /dev/null
+++ b/src/main/java/Validator.java
@@ -0,0 +1,8 @@
+public class Validator {
+    public static boolean checkIfEmpty(String[] input) {
+        if(input[0].equals("")){
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/src/test/java/ArithmeticOperatorTest.java b/src/test/java/ArithmeticOperatorTest.java
new file mode 100644
index 0000000..d4ca499
--- /dev/null
+++ b/src/test/java/ArithmeticOperatorTest.java
@@ -0,0 +1,4 @@
+package PACKAGE_NAME;
+
+public class ArithmeticOperatorTest {
+}
diff --git a/src/test/java/ValidatorTest.java b/src/test/java/ValidatorTest.java
new file mode 100644
index 0000000..5230a51
--- /dev/null
+++ b/src/test/java/ValidatorTest.java
@@ -0,0 +1,20 @@
+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;
+
+public class ValidatorTest {
+    private Validator validator;
+    @BeforeEach
+    void setUp() {
+        validator = new Validator();
+    }
+
+    @DisplayName("더하기")
+    @Test
+    public void getSum() {
+        assertThat(validator.checkIfEmpty(new String[] {"1","2","3"})).isEqualTo(true);
+        assertThat(validator.checkIfEmpty(new String[] {""})).isEqualTo(false);
+    }
+}

From c6886d4422b8c88c0a5b25e533bbc1fade0aabde Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Wed, 17 Jun 2020 13:29:47 +0900
Subject: [PATCH 09/10] Separate sum part from Calculator and edit test

---
 src/main/java/ArithmeticOperator.java     |  5 ++++-
 src/main/java/Calculator.java             |  8 +++++---
 src/test/java/ArithmeticOperatorTest.java | 17 ++++++++++++++++-
 src/test/java/CalculatorTest.java         |  3 +++
 4 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/main/java/ArithmeticOperator.java b/src/main/java/ArithmeticOperator.java
index 576cf72..2ce17f4 100644
--- a/src/main/java/ArithmeticOperator.java
+++ b/src/main/java/ArithmeticOperator.java
@@ -1,4 +1,7 @@
-package PACKAGE_NAME;
+import java.util.stream.Stream;
 
 public class ArithmeticOperator {
+    public static int sum(String[] inputs) {
+        return Stream.of(inputs).mapToInt(x-> Integer.parseInt(x)).reduce((a, b)-> a+b).getAsInt();
+    }
 }
diff --git a/src/main/java/Calculator.java b/src/main/java/Calculator.java
index 2472812..73c14df 100644
--- a/src/main/java/Calculator.java
+++ b/src/main/java/Calculator.java
@@ -1,7 +1,9 @@
-import java.util.stream.Stream;
-
 public class Calculator {
+
     public static int getSum(String[] inputs) {
-        return Stream.of(inputs).mapToInt(x-> Integer.parseInt(x)).reduce((a,b)-> a+b).getAsInt();
+        if(Validator.checkIfEmpty(inputs) == false){
+            return 0;
+        }
+        return ArithmeticOperator.sum(inputs);
     }
 }
diff --git a/src/test/java/ArithmeticOperatorTest.java b/src/test/java/ArithmeticOperatorTest.java
index d4ca499..25e83e9 100644
--- a/src/test/java/ArithmeticOperatorTest.java
+++ b/src/test/java/ArithmeticOperatorTest.java
@@ -1,4 +1,19 @@
-package PACKAGE_NAME;
+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;
 
 public class ArithmeticOperatorTest {
+    private ArithmeticOperator arithmeticOperator;
+    @BeforeEach
+    void setUp() {
+        arithmeticOperator = new ArithmeticOperator();
+    }
+
+    @DisplayName("더하기")
+    @Test
+    public void getSum() {
+        assertThat(arithmeticOperator.sum(new String[] {"1","2","3"})).isEqualTo(6);
+    }
 }
diff --git a/src/test/java/CalculatorTest.java b/src/test/java/CalculatorTest.java
index 1ec4729..88827cc 100644
--- a/src/test/java/CalculatorTest.java
+++ b/src/test/java/CalculatorTest.java
@@ -1,4 +1,5 @@
 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;
@@ -10,8 +11,10 @@ void setUp() {
         calculator = new Calculator();
     }
 
+    @DisplayName("더하기")
     @Test
     public void getSum() {
         assertThat(calculator.getSum(new String[] {"1","2","3"})).isEqualTo(6);
+        assertThat(calculator.getSum(new String[] {""})).isEqualTo(0);
     }
 }

From d0b3479e8777f86e6931cf9ab1f37fcbd54dcce9 Mon Sep 17 00:00:00 2001
From: gyim1345 <gyim1345@gmail.com>
Date: Wed, 17 Jun 2020 13:30:32 +0900
Subject: [PATCH 10/10] Add Display Name

---
 src/test/java/DecifererTest.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/test/java/DecifererTest.java b/src/test/java/DecifererTest.java
index 88d3a18..505fc0b 100644
--- a/src/test/java/DecifererTest.java
+++ b/src/test/java/DecifererTest.java
@@ -1,4 +1,5 @@
 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;
@@ -10,6 +11,7 @@ void setUp() {
         deciferer = new Deciferer();
     }
 
+    @DisplayName("문자 추출")
     @Test
     public void extractElements() {
         assertThat(deciferer.extractElements("3;3;3")).isEqualTo(new String[] {"3","3","3"});