Advent of Code 2021 - Day 2

Author: CodingNagger

README.md

@@ -19,5 +19,6 @@ mvn clean test
 Last year I ran a [cruise log for my 25 days competing in the Advent of Code](https://www.codingnagger.com/tag/advent-of-code-2020/) and decided I would at least try to do the same this year.
 
 - [The Advent of Code 2021 Day 1 log, starting slow](https://www.codingnagger.com/2021/12/01/the-advent-of-code-2021-day-1-log-starting-slow/)
+- [The Advent of Code 2021 Day 2 log, sneaky release](https://www.codingnagger.com/2021/12/02/the-advent-of-code-2021-day-2-log-sneaky-release/)
 
 

src/main/java/com/codingnagger/App.java

@@ -2,6 +2,7 @@
 
 import com.codingnagger.days.Day;
 import com.codingnagger.days.Day1;
+import com.codingnagger.days.Day2;
 import com.codingnagger.utils.InputLoader;
 
 import java.io.IOException;
@@ -14,9 +15,9 @@ public class App {
     public static void main(String[] args) throws IOException {
         System.out.println("Advent of Code 2021");
 
-        List<String> input = new InputLoader().Load("day1.txt");
+        List<String> input = InputLoader.Load("day2.txt");
 
-        Day day = new Day1();
+        Day day = new Day2();
 
         System.out.println("Part 1:");
         System.out.println(day.partOne(input));

src/main/java/com/codingnagger/days/Day2.java

@@ -0,0 +1,74 @@
+package com.codingnagger.days;
+
+import java.util.List;
+
+import static com.codingnagger.utils.InputConverter.convertToIntegers;
+
+public class Day2 implements Day {
+
+    @Override
+    public String partOne(List<String> input) {
+        Submarine s = new Submarine();
+        input.forEach(i -> s.move(i));
+        return "" + s.depth * s.horizontalPosition;
+    }
+
+    @Override
+    public String partTwo(List<String> input) {
+        Submarine2 s = new Submarine2();
+        input.forEach(i -> s.move(i));
+        return "" + s.depth * s.horizontalPosition;
+    }
+
+    public class Submarine2 {
+        int depth = 0;
+        int horizontalPosition = 0;
+        int aim = 0;
+
+        void move(String action) {
+            String[] actionDetails = action.split(" ");
+            String command = actionDetails[0];
+            int value = Integer.parseInt(actionDetails[1]);
+
+            switch (command) {
+                case "forward":
+                    horizontalPosition += value;
+                    depth += aim * value;
+                    break;
+
+                case "down":
+                    aim += value;
+                    break;
+
+                case "up":
+                    aim -= value;
+                    break;
+            }
+        }
+    }
+
+    public class Submarine {
+        int depth = 0;
+        int horizontalPosition = 0;
+
+        void move(String action) {
+            String[] actionDetails = action.split(" ");
+            String command = actionDetails[0];
+            int value = Integer.parseInt(actionDetails[1]);
+
+            switch (command) {
+                case "forward":
+                    horizontalPosition += value;
+                    break;
+
+                case "down":
+                    depth += value;
+                    break;
+
+                case "up":
+                    depth -= value;
+                    break;
+            }
+        }
+    }
+}

src/main/java/com/codingnagger/utils/InputLoader.java

@@ -6,15 +6,19 @@
 import java.util.List;
 
 public class InputLoader {
-    public static List<String> Load(String filename) throws IOException {
+    public static List<String> Load(String filename) {
         return Load("main", filename);
     }
 
-    public static List<String> LoadTest(String filename) throws IOException {
+    public static List<String> LoadTest(String filename) {
         return Load("test", filename);
     }
 
-    public static List<String> Load(String resourcesParent, String filename) throws IOException {
-        return Files.readAllLines(Paths.get("src", resourcesParent, "resources", filename));
+    private static List<String> Load(String resourcesParent, String filename) {
+        try {
+            return Files.readAllLines(Paths.get("src", resourcesParent, "resources", filename));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 }