[문자열 덧셈 계산기] 박서연 미션 제출합니다.

src/main/java/calculator/Application.java

@@ -1,7 +1,121 @@
 package calculator;
 
+import camp.nextstep.edu.missionutils.Console;
+
+import java.util.*;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class Application {
+
+    static List<String> store;
+    static List<Integer> integerList;
+
     public static void main(String[] args) {
-        // TODO: 프로그램 구현
+
+        System.out.println("덧셈할 문자열을 입력해 주세요.");
+
+        String input = Console.readLine();
+
+        // 입력값 null 검사
+        try {
+            isNull(input);
+        } catch (IllegalArgumentException e) {
+            return;
+        }
+
+        // 공백 지우기
+        input = removeSpace(input);
+
+        store = new ArrayList<>();
+        store.add(",");
+        store.add(":");
+
+        makeCustomDelimiter(input);
+
+        input = delimiterToSpace(input);
+
+        String[] strList = input.split(" ");
+        integerList = new ArrayList<>();
+
+        try {
+            strToInt(strList);
+        } catch (IllegalArgumentException e) {
+            return;
+        }
+
+        Integer sum = 0;
+
+        for (Integer integer : integerList) {
+            sum += integer;
+        }
+
+        System.out.println("결과 : " + sum);
+
+    }
+
+    public static void isNull(String input) {
+
+        if (input == null) {
+            throw new IllegalArgumentException("입력값은 null입니다.");
+        }
+
+    }
+
+    public static String removeSpace(String input) {
+
+        input = input.replaceAll(" ", "");
+        input = input.replaceAll("\\p{Z}", "");
+
+        return input;
+    }
+
+    public static void makeCustomDelimiter(String input) {
+
+        String pattern = "//.*?\\\\n";
+
+        Pattern regex = Pattern.compile(pattern);
+        Matcher matcher = regex.matcher(input);
+
+        while (matcher.find()) {
+            String deli = matcher.group();
+            store.add(deli);
+            deli = deli.replace("//","");
+            deli = deli.replace("\\n", "");
+            store.add(deli);
+        }
+
+    }
+
+    public static String delimiterToSpace(String input) {
+
+        for (String s : store) {
+            input = input.replaceAll(Pattern.quote(s), " ");
+        }
+
+        input = input.trim();
+
+        return input;
     }
+
+    public static void strToInt(String[] strList) {
+
+        for (String s : strList) {
+            Integer integer;
+            try {
+                integer = Integer.parseInt(s);
+            } catch (NumberFormatException e) {
+                throw new IllegalArgumentException("올바르지 않은 입력입니다.");
+            }
+
+            if (integer < 0) {
+                throw new IllegalArgumentException("올바르지 않은 입력입니다.");
+            }
+
+            integerList.add(integer);
+        }
+
+    }
+
+
 }