[문자열 덧셈 계산기] 추연수 미션 제출합니다.

src/main/java/calculator/Application.java

@@ -1,7 +1,17 @@
 package calculator;
 
+import static camp.nextstep.edu.missionutils.Console.readLine;
+
+import java.io.IOError;
+
 public class Application {
-    public static void main(String[] args) {
-        // TODO: 프로그램 구현
+
+    public static void main(String[] args) throws IOError {
+        System.out.println("덧셈할 문자열을 입력해 주세요.");
+        String str = readLine();
+
+        Calculator cal = new Calculator(str);
+
+        System.out.println("결과 : " + cal.getResult());
     }
 }

src/main/java/calculator/Calculator.java

@@ -0,0 +1,66 @@
+package calculator;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+public class Calculator {
+    private final String input;
+    private final Set<String> delimiterSet = new HashSet<>(List.of(":", ","));
+    private final String delimiterPattern = "//\\D\\\\n";
+
+    public Calculator(String input) {
+        this.input = input;
+    }
+
+    public int getResult() {
+        //입력 조건 실패시 오류 발생
+        if(!Validation.inputCheck(input)) throw new IllegalArgumentException("입력값이 맞지 않습니다.");
+        customDelimiter();
+
+        return addResultValues(getDelimiterSplitValues());
+    }
+
+    //커스텀 구분자 추가하기
+    private void customDelimiter() {
+        Pattern pattern = Pattern.compile(delimiterPattern);
+        Matcher matcher = pattern.matcher(input);
+
+        while (matcher.find()) {
+            String match = matcher.group();
+            String delimiter = match.replaceAll("(//|\\\\n)", "");
+
+            if(delimiter.startsWith("\\")) {
+                delimiterSet.add("\\" + delimiter);
+            } else {
+                delimiterSet.add(delimiter);
+            }
+        }
+    }
+
+    private String[] getDelimiterSplitValues(){
+        String removePattern = input.replaceAll(delimiterPattern, "");
+
+        String regex = "[" + delimiterSet.stream().map(String::valueOf).collect(Collectors.joining("")) + "]";
+
+        return removePattern.split(regex);
+    }
+
+    private int addResultValues(String[] values) {
+        if(!Validation.formatCheck(values)) throw new IllegalArgumentException("구분자가 포함되어 있습니다");
+
+        int sum = 0;
+        for (String value : values) {
+            sum += Integer.parseInt(value);
+        }
+        return sum;
+    }
+
+    private Set<String> getDelimiterSet() {
+        customDelimiter();
+        return delimiterSet;
+    }
+}

src/main/java/calculator/Validation.java

@@ -0,0 +1,14 @@
+package calculator;
+
+import java.util.Arrays;
+
+public class Validation {
+    public static boolean inputCheck(String input) {
+        String inputPattern = "(//\\D\\\\n)*([0-9]+)(\\D[0-9]+)*";
+        return input.matches(inputPattern);
+    }
+
+    public static boolean formatCheck(String[] values) {
+        return Arrays.stream(values).allMatch(value -> value.matches("[0-9]+"));
+    }
+}