refactor: remove the throw argument for open file, and add try catch

src/ReadFile.java

@@ -10,25 +10,30 @@ public class ReadFile {
 	 * @param filename the name of the file with, only allowing a .txt extension
 	 * @return The contents of the file
 	 */
-	public List<String> open(String filename) throws IllegalArgumentException, FileNotFoundException {
+	public List<String> open(String filename) {
 		// Check that the filetype is correct, otherwise, throw IllegalArgumentException
 		if (!filename.endsWith(".txt")) {
 			throw new IllegalArgumentException("The filename is not a .txt format");
 		}
-		
-		// Open the file that was defined
+
 		File file = new File(filename);
-		Scanner reader = new Scanner(file);
-		
+		Scanner reader;
+		try {
+			// Open the file that was defined
+			reader = new Scanner(file);
+		} catch (FileNotFoundException e) {
+			throw new RuntimeException(e);
+		}
+
 		// List for all the separate lines on the database
 		List<String> data = new ArrayList<>();
-		
+
 		// Go through all the lines in the file and append them to the list `data`
 		while (reader.hasNextLine()) {
 			String currentData = reader.nextLine();
 			data.add(currentData);
 		}
-		
+
 		return data;
 	}
 }