Add Generic day 1

day_01/java/Generic.java

@@ -0,0 +1,62 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Scanner;
+
+class Generic {
+	/*
+	 * Expects two command line arguments:
+	 * - The file name to load
+	 * - The number of top values to sum together
+	 */
+	public static void main (String[] args) {
+		Scanner f;
+		try {
+			f = Generic.readFile(args[0]);
+		} catch (FileNotFoundException e) {
+			System.out.println("File not found, stopping execution");
+			return;
+		}
+
+		Integer count = Integer.parseInt(args[1]);
+
+		ArrayList<Integer> top = new ArrayList<Integer>();
+		Integer runningSum = 0;
+		while (f.hasNextLine()) {
+			String l = f.nextLine();
+			if (l.equals("")) {
+				if (top.size() < count) {
+					top.add(runningSum);
+				}
+				else if (Collections.min(top) < runningSum) {
+					top.add(runningSum);
+					top.removeIf(x -> x <= Collections.min(top));
+				}
+				runningSum = 0;
+			} else {
+				runningSum = runningSum + Integer.parseInt(l);
+			}
+		}
+		f.close();
+
+
+		Collections.sort(top, Collections.reverseOrder());
+		System.out.print(
+			"The largest " + count + " values are: "
+			+ top.subList(0, count).toString()
+			+ " totalling: "
+		);
+		Integer sum = 0;
+		for (int i = 0; i < count; i++) {
+			sum = sum + top.get(i);
+		}
+		System.out.println(sum);
+	}
+
+	private static Scanner readFile(String file) throws FileNotFoundException {
+		File f = new File(file);
+		Scanner s = new Scanner(f);
+		return s;
+	}
+}