Add rest of the CodeQuality changes.

src/main/java/zoe/DoneStates.java

@@ -0,0 +1,6 @@
+package zoe;
+
+public enum DoneStates {
+    NotDone,
+    Done;
+}

src/main/java/zoe/LoadSplit.java

@@ -0,0 +1,16 @@
+package zoe;
+
+public enum LoadSplit {
+    Task_Type(0),
+    Description(1),
+    Status(2);
+
+    private final int idx;
+    private LoadSplit(int idx) {
+        this.idx = idx;
+    }
+
+    public int getIdx() {
+        return idx;
+    }
+}

src/main/java/zoe/Loader.java

@@ -25,16 +25,24 @@ public ArrayList<Task> loadTasks(){
                 BufferedReader reader = new BufferedReader(new FileReader(file));
                 ArrayList<Task> loadedTasks = new ArrayList<Task>();
                 String line;
+
                 while (!(line = reader.readLine()).equals("EOF")) {
                     String[] readTask = line.split("_");
-                    if (readTask[0].equals("todo")) {
-                        ToDo td = new ToDo(readTask[1], readTask[2]);
+                    int taskType = LoadSplit.Task_Type.getIdx();
+                    int description = LoadSplit.Description.getIdx();
+                    int status = LoadSplit.Status.getIdx();
+
+                    if (readTask[taskType].equals("todo")) {
+                        ToDo td = new ToDo(
+                                readTask[description], readTask[status]);
                         loadedTasks.add(td);
-                    } else if (readTask[0].equals("event")) {
-                        Event e = new Event(readTask[1], readTask[2]);
+
+                    } else if (readTask[taskType].equals("event")) {
+                        Event e = new Event(readTask[description], readTask[status]);
                         loadedTasks.add(e);
+
                     } else {
-                        Deadline dl = new Deadline(readTask[1], readTask[2]);
+                        Deadline dl = new Deadline(readTask[description], readTask[status]);
                         loadedTasks.add(dl);
                     }
                 }

src/main/java/zoe/Parser.java

@@ -33,14 +33,12 @@ public String carryOutShortCommand(String command) {
         String res = "";
         if (command.equals("list")) {
             if (tl.getSize() < 1) {
-                res += "Sorry you dont have any tasks currently D:";
+                res += "Sorry you don't have any tasks currently D:";
             } else {
                 for (int i = 1; i <= tl.getSize(); i++) {
-                    res += String.format("%d.%s\n",
-                            i, tl.get(i).getStatus());
+                    res += String.format("%d.%s\n", i, tl.get(i).getStatus());
                 }
             }
-            return res;
 
         } else {
             if (command.equals("todo")) {
@@ -49,8 +47,9 @@ public String carryOutShortCommand(String command) {
                 res += ui.invalidCommand();
             }
 
-            return res;
         }
+
+        return res;
     }
 
     /**
@@ -88,6 +87,7 @@ public String carryOutLongCommand(String command, String commandDescription) {
                 }
 
                 return res;
+
             case "mark":
                 tl.markAsDone(Integer.parseInt(commandDescription));
                 return ui.markedTask(tl.get(Integer.parseInt(commandDescription)));
@@ -98,10 +98,13 @@ public String carryOutLongCommand(String command, String commandDescription) {
                 Task deletedTask = tl.get(Integer.parseInt(commandDescription));
                 tl.delete(Integer.parseInt(commandDescription));
                 return ui.deletedTask(deletedTask, tl.getSize());
+
             default:
                 return ui.invalidCommand();
             }
+
         } catch (IndexOutOfBoundsException e) {
+            //catches invalid index from user input for mark, unmark and delete
             return ui.invalidIndex(tl.getSize());
         } catch (DateTimeParseException d) {
             return ui.invalidDate();

src/main/java/zoe/Task.java

@@ -50,9 +50,9 @@ public int isDoneNumerical() {
         //to help with saving and loading
         if (this.isDone) {
             return 1;
-        } else {
-            return 0;
         }
+
+        return 0;
     }
 
     /**

src/main/java/zoe/TaskList.java

@@ -24,7 +24,7 @@ public void add(Task t) {
      * @param i
      */
     public void delete(int i) {
-            tasks.remove(Integer.valueOf(i) - 1);
+        tasks.remove(Integer.valueOf(i) - 1);
     }
 
     /**
@@ -54,9 +54,4 @@ public Task get(int i) {
         return this.tasks.get(i - 1);
     }
 
-    /**
-     * Checks if a task exists in the list given an index when isValid(index) is called.
-     * @param i
-     * @return
-     */
 }