Improve Code quality

data/duke.txt

@@ -1 +1,2 @@
 T|true|1
+T|false|2

src/main/java/duke/Duke.java

@@ -176,28 +176,6 @@ private String getResponse(String input) {
         return ui.getLastMsg();
     }
 
-    /*
-    public void run() {
-        ui.showWelcome();
-        boolean isExit = false;
-        Storage.readTask(tasks, ui);
-
-        while (!isExit) {
-            try {
-                String userInput = ui.readInput();
-                ui.showLine();
-                Command command = Parser.parse(userInput);
-                isExit = command.execute(this.tasks, ui);
-                Storage.writeTask(tasks, ui); // Store to file
-            } catch (DukeException e) {
-                ui.showError(e.getMessage());
-            } finally {
-                ui.showLine();
-            }
-        }
-    }
-     */
-
     /**
      * DialogBox.
      */

src/main/java/duke/Storage.java

@@ -23,60 +23,83 @@ public class Storage {
      */
     public static void readTask(TaskList tasks, Ui ui) {
         try {
-            File directory = new File("./data");
-            File file = new File(filePath);
+            File file = checkFileExist(ui);
+            readFile(tasks, file);
+        } catch (FileNotFoundException e) {
+            ui.showError(e.getMessage());
+        } catch (DukeException e) {
+            ui.showError(e.getMessage());
+        }
+    }
 
-            if (!directory.exists()) {
-                directory.mkdir();
-            }
+    /**
+     * Check if file exist.
+     * Create new if it does not exist.
+     *
+     * @param ui To show error message.
+     * @return file.
+     */
+    private static File checkFileExist(Ui ui) {
+        File directory = new File("./data");
+        File file = new File(filePath);
 
-            if (!file.exists()) {
-                try {
-                    file.createNewFile();
-                } catch (IOException e) {
-                    ui.showError("Error creating new file: " + e.getMessage());
-                }
-            }
+        if (!directory.exists()) {
+            directory.mkdir();
+        }
 
-            Scanner scanner = new Scanner(file);
-            while (scanner.hasNextLine()) {
-                Task task;
+        if (!file.exists()) {
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+                ui.showError("Error creating new file: " + e.getMessage());
+            }
+        }
+        return file;
+    }
 
-                String line = scanner.nextLine();
-                String[] parts = line.split("\\|");
-                String taskType = parts[0];
-                boolean isDone = parts[1].equals("true");
-                String description = parts[2];
+    /**
+     * Read the file and store it in tasklist.
+     *
+     * @param tasks List of tasks.
+     * @param file To read.
+     * @throws FileNotFoundException When file not found.
+     * @throws DukeException When failes to save on list.
+     */
+    private static void readFile(TaskList tasks, File file) throws FileNotFoundException, DukeException {
+        Scanner scanner = new Scanner(file);
+        while (scanner.hasNextLine()) {
+            Task task;
 
-                switch (taskType) {
-                case "T":
-                    task = new Todo(description);
-                    break;
-                case "D":
-                    String date = parts[3];
-                    task = new Deadline(description, date);
-                    break;
-                case "E":
-                    String from = parts[3];
-                    String to = parts[4];
-                    task = new Event(description, from, to);
-                    break;
-                default:
-                    continue;
-                }
+            String line = scanner.nextLine();
+            String[] parts = line.split("\\|");
+            String taskType = parts[0];
+            boolean isDone = parts[1].equals("true");
+            String description = parts[2];
 
-                if (isDone) {
-                    task.mark();
-                }
+            switch (taskType) {
+            case "T":
+                task = new Todo(description);
+                break;
+            case "D":
+                String date = parts[3];
+                task = new Deadline(description, date);
+                break;
+            case "E":
+                String from = parts[3];
+                String to = parts[4];
+                task = new Event(description, from, to);
+                break;
+            default:
+                continue;
+            }
 
-                tasks.add(task);
+            if (isDone) {
+                task.mark();
             }
-            scanner.close();
-        } catch (FileNotFoundException e) {
-            ui.showError(e.getMessage());
-        } catch (DukeException e) {
-            ui.showError(e.getMessage());
+
+            tasks.add(task);
         }
+        scanner.close();
     }
 
 

src/main/java/duke/TaskList.java

@@ -37,7 +37,7 @@ public void add(Task task) {
      * @param index The index of the task to be removed.
      */
     public void remove(int index) {
-        assert  index >= 0 : "index should be >= 0";
+        assert index >= 0 : "index should be >= 0";
         tasks.remove(index);
     }
 
@@ -47,7 +47,7 @@ public void remove(int index) {
      * @param index The index of the task to be marked as done.
      */
     public void mark(int index) {
-        assert  index >= 0 : "index should be >= 0";
+        assert index >= 0 : "index should be >= 0";
         tasks.get(index).mark();
     }
 
@@ -57,7 +57,7 @@ public void mark(int index) {
      * @param index The index of the task to be unmarked.
      */
     public void unmark(int index) {
-        assert  index >= 0 : "index should be >= 0";
+        assert index >= 0 : "index should be >= 0";
         tasks.get(index).unmark();
     }
 
@@ -107,7 +107,7 @@ public String toString() {
      * @return all task on the date.
      * @throws DukeException
      */
-    public String getbyDate(String date) throws DukeException {
+    public String getByDate(String date) throws DukeException {
         LocalDate targetDate;
         try {
             targetDate = LocalDate.parse(date);

src/main/java/duke/command/ListCommand.java

@@ -21,7 +21,7 @@ public boolean execute(TaskList tasks, Ui ui) throws DukeException {
         String msg = ui.getLastMsg();
         String[] parts = msg.toLowerCase().split("\\s+");
         if (parts.length >= 2) { // If the date is provided
-            ui.respond(tasks.getbyDate(parts[1]));
+            ui.respond(tasks.getByDate(parts[1]));
         } else {
             ui.respond(tasks.toString());
         }