Add day 1 in Java

Signed-off-by: AKP <tom@tdpain.net>

challenges/2022/01-calorieCounting/java/src/Challenge.java

@@ -0,0 +1,50 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Challenge {
+    private ArrayList<Integer> parsedInput;
+
+    public Challenge(String filename) throws FileNotFoundException {
+        parsedInput = new ArrayList<>();
+
+        File inputFile = new File(filename);
+        Scanner reader = new Scanner(inputFile);
+
+        int acc = 0;
+        while (reader.hasNextLine()) {
+            String thisLine = reader.nextLine();
+
+            if ("".equals(thisLine)) {
+                if (acc != 0) {
+                    parsedInput.add(acc);
+                    acc = 0;
+                }
+            } else {
+                acc += Integer.parseInt(thisLine);
+            }
+        }
+    }
+
+    public int partOne() {
+        int largest = 0;
+        for (Integer x : parsedInput) {
+            if (x > largest) {
+                largest = x;
+            }
+        }
+        return largest;
+    }
+
+    public int partTwo() {
+        ArrayList<Integer> clonedInput = (ArrayList<Integer>) parsedInput.clone();
+        clonedInput.sort(Integer::compareTo);
+        int acc = 0;
+        for (int i = clonedInput.size()-1; i >= clonedInput.size() - 3; i -= 1) {
+            acc += clonedInput.get(i);
+        }
+        return acc;
+    }
+
+}

challenges/2022/01-calorieCounting/java/src/Main.java

@@ -0,0 +1,9 @@
+import java.io.FileNotFoundException;
+
+public class Main {
+    public static void main(String[] args) throws FileNotFoundException {
+        Challenge c = new Challenge("input.txt");
+        System.out.println(c.partOne());
+        System.out.println(c.partTwo());
+    }
+}

challenges/2022/README.md

@@ -10,7 +10,7 @@ Solutions to the [2022 Advent of Code](https://adventofcode.com/2022).
 
 | Day                                 | Status             | Solutions  | Notes  |
 | ----------------------------------- | ------------------ | ---------- | ------ |
-| 01 - Calorie Counting               | ★ ★                | [Python](01-calorieCounting/py), [Nim](01-calorieCounting/nim) | Summing numbers |
+| 01 - Calorie Counting               | ★ ★                | [Python](01-calorieCounting/py), [Nim](01-calorieCounting/nim), [Java](01-calorieCounting/java/src) | Summing numbers |
 
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