Implement Enums for Task Types

src/main/java/Deadline.java

@@ -2,7 +2,7 @@ public class Deadline extends Task{
     private String taskDate;
 
     public Deadline(String taskName, String taskDate, boolean isDone) {
-        super(taskName, "Deadline", false);
+        super(taskName, TaskType.DEADLINE, false);
         this.taskDate = taskDate;
     }
 

src/main/java/Duke.java

@@ -43,15 +43,15 @@ public static void main(String[] args) throws DukeException {
                         break;
 
                     case "todo":
-                        createNewTask(userInputScanner, "ToDo");
+                        createNewTask(userInputScanner, TaskType.TODO);
                         break;
 
                     case "deadline":
-                        createNewTask(userInputScanner, "Deadline");
+                        createNewTask(userInputScanner, TaskType.DEADLINE);
                         break;
 
                     case "event":
-                        createNewTask(userInputScanner, "Event");
+                        createNewTask(userInputScanner, TaskType.EVENT);
                         break;
 
                     case "delete":
@@ -82,16 +82,16 @@ private static void completeTask(int taskNum) {
         System.out.printf("\t\t%s\n", tasks.get(taskNum - 1));
     }
 
-    private static void createNewTask(Scanner userInputScanner, String taskType)
+    private static void createNewTask(Scanner userInputScanner, TaskType taskType)
             throws MissingInputException {
         if (!userInputScanner.hasNext())
-            throw new MissingInputException();
-        else if (taskType.equalsIgnoreCase("ToDo")) {
+            throw new MissingInputException(taskType);
+        else if (taskType == TaskType.TODO) {
             Task newTask = new ToDo(userInputScanner.nextLine());
             addNewTask(newTask);
         }
         else {
-            if (taskType.equalsIgnoreCase("Deadline"))
+            if (taskType == TaskType.DEADLINE)
                 userInputScanner.useDelimiter(" /by ");
             else
                 userInputScanner.useDelimiter(" /at ");

src/main/java/Event.java

@@ -2,7 +2,7 @@ public class Event extends Task{
     private String taskDate;
 
     public Event(String taskName, String taskDate, boolean isDone) {
-        super(taskName, "Event", false);
+        super(taskName, TaskType.EVENT, false);
         this.taskDate = taskDate;
     }
 

src/main/java/MissingInputException.java

@@ -1,5 +1,5 @@
 public class MissingInputException extends DukeException {
-    public MissingInputException() {
-        super("Missing input for this operation");
+    public MissingInputException(TaskType taskType) {
+        super("The description for " + taskType + " cannot be empty");
     }
 }

src/main/java/Task.java

@@ -1,15 +1,15 @@
 public class Task {
     private String taskName;
-    private String taskType;
+    private TaskType taskType;
     private boolean isDone;
 
-    public Task(String taskName, String taskType, boolean isDone) {
+    public Task(String taskName, TaskType taskType, boolean isDone) {
         this.taskName = taskName;
         this.taskType = taskType;
         this.isDone = isDone;
     }
 
-    public Task(String taskName, String taskType) {
+    public Task(String taskName, TaskType taskType) {
         this(taskName, taskType, false);
     }
 
@@ -35,3 +35,5 @@ public String toString() {
         return String.format("[%s] %s", checked, taskName);
     }
 }
+
+;

src/main/java/TaskType.java

@@ -0,0 +1,3 @@
+public enum TaskType {
+    TODO, DEADLINE, EVENT
+}

src/main/java/ToDo.java

@@ -1,6 +1,6 @@
 public class ToDo extends Task{
     public ToDo(String taskName, boolean isDone) {
-        super(taskName, "ToDo", false);
+        super(taskName, TaskType.TODO, false);
     }
 
     public ToDo(String taskName) {

text-ui-test/EXPECTED.TXT

@@ -37,7 +37,7 @@ Duke:
 
 User:
 Duke:
-	Error: Missing input for this operation.
+	Error: The description for TODO cannot be empty.
 
 User:
 Duke: