Organize classes into Packages

src/main/java/Duke.java

@@ -1,4 +1,7 @@
 import java.util.Scanner;
+import duke.TaskList;
+import duke.Parser;
+import duke.Ui;
 
 public class Duke {
     public static void main(String[] args) {

src/main/java/DateTime.java → src/main/java/duke/DateTime.java

@@ -1,3 +1,5 @@
+package duke;
+
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;

src/main/java/Deadline.java → src/main/java/duke/Deadline.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Deadline extends Task {
     private DateTime deadline;
 

src/main/java/DukeException.java → src/main/java/duke/DukeException.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class DukeException extends Exception {
     public DukeException(String errorMessage) {
         super(errorMessage);

src/main/java/Event.java → src/main/java/duke/Event.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Event extends Task {
     private DateTime time;
 

src/main/java/InvalidDataException.java → src/main/java/duke/InvalidDataException.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class InvalidDataException extends DukeException {
     public InvalidDataException() {
         super("OOPS!!! The data here is invalid!");

src/main/java/InvalidDescriptionException.java → src/main/java/duke/InvalidDescriptionException.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class InvalidDescriptionException extends DukeException {
     public InvalidDescriptionException() {
         super("OOPS!!! The description of a task cannot be empty");

src/main/java/InvalidIndexException.java → src/main/java/duke/InvalidIndexException.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class InvalidIndexException extends DukeException {
     public InvalidIndexException() {
         super("OOPS!!! The index you have chosen is out of bounds");

src/main/java/InvalidTypeException.java → src/main/java/duke/InvalidTypeException.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class InvalidTypeException extends DukeException {
     public InvalidTypeException() {
         super("OOPS!!! I'm sorry, but I don't know what that means :-(");

src/main/java/Parser.java → src/main/java/duke/Parser.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Parser {
 
     public static Task handleInput(String input) throws InvalidDescriptionException, InvalidTypeException {

src/main/java/Storage.java → src/main/java/duke/Storage.java

@@ -1,3 +1,5 @@
+package duke;
+
 import java.util.ArrayList;
 import java.io.FileWriter;
 import java.io.IOException;

src/main/java/Task.java → src/main/java/duke/Task.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Task {
     protected String title;
     protected boolean complete;

src/main/java/TaskList.java → src/main/java/duke/TaskList.java

@@ -1,3 +1,5 @@
+package duke;
+
 import java.util.ArrayList;
 import java.io.FileWriter;
 import java.io.IOException;

src/main/java/Todo.java → src/main/java/duke/Todo.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Todo extends Task {
 
     public Todo(String input) {

src/main/java/Ui.java → src/main/java/duke/Ui.java

@@ -1,3 +1,5 @@
+package duke;
+
 public class Ui {
     private static final String OPENING = " ____        _        \n"
             + "|  _ \\ _   _| | _____ \n"