solution for part one

Author: zayzou

com/zayzou/day00/Day01.java

@@ -0,0 +1,57 @@
+package com.zayzou.day00;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Collections;
+import java.util.Optional;
+import java.util.OptionalInt;
+import java.util.stream.IntStream;
+
+public class Day01 {
+
+    public static void main(String[] args) {
+        final var FILE = "com/zayzou/day00/input.txt";
+        System.out.println(sumOfAllValues(FILE));
+    }
+
+    private static int sumOfAllValues(String FILE) {
+        //use auto close ressource to read the file
+        try (BufferedReader br = new BufferedReader(new FileReader(FILE))) {
+            var ligne = "";
+            int sum = 0;
+            //while there is new line we go through...
+            while ((ligne = br.readLine()) != null) {
+                final var l = ligne;
+                //look for the first digit
+                OptionalInt first = ligne.chars()
+                        .filter(Character::isDigit)
+                        .map(Character::getNumericValue)
+                        .findFirst();
+
+
+                //look for the last digit
+
+                Optional<Integer> last = IntStream.range(0, ligne.length())
+                        .boxed()
+                        .sorted(Collections.reverseOrder())
+                        .filter(i -> Character.isDigit(l.charAt(i)))
+                        .map(i -> Character.getNumericValue(l.charAt(i)))
+                        .findFirst();
+
+
+                //create the number from the 2 digits
+                Integer number = Integer.valueOf(first.getAsInt() + "" + last.get());
+                sum += number;
+
+            }
+            return sum;
+        } catch (IOException ex) {
+            throw new RuntimeException(ex.getMessage());
+        }
+    }
+}