diff --git a/src/main/java/Deadline.java b/src/main/java/Deadline.java
new file mode 100644
index 0000000000..011d8bcede
--- /dev/null
+++ b/src/main/java/Deadline.java
@@ -0,0 +1,14 @@
+public class Deadline extends Task {
+
+    protected String by;
+
+    public Deadline(String description, String by) {
+        super(description);
+        this.by = by;
+    }
+
+    @Override
+    public String toString() {
+        return "[D]" + super.toString() + " (" + by + ")";
+    }
+}
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 5d313334cc..a33f8e318a 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,10 +1,78 @@
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Scanner;
+import static java.lang.Integer.parseInt;
+
 public class Duke {
-    public static void main(String[] args) {
+    public static void main(String[] args) throws DukeException {
         String logo = " ____        _        \n"
                 + "|  _ \\ _   _| | _____ \n"
                 + "| | | | | | | |/ / _ \\\n"
                 + "| |_| | |_| |   <  __/\n"
                 + "|____/ \\__,_|_|\\_\\___|\n";
         System.out.println("Hello from\n" + logo);
+
+        String line = "     -----------------------------------------------------------------\n";
+        String tab = "      ";
+        String greet = line
+                + tab + "Hello! I'm Duke\n"
+                + tab + "What can I do for you?\n"
+                + line;
+        System.out.println(greet);
+
+        ArrayList<Task> list = new ArrayList<Task>();
+        Scanner input = new Scanner(System.in);
+
+        while (!input.hasNext("bye")) {
+            String next = input.nextLine();
+            if (next.contains("done")) {
+                String[] sub = next.split(" ");
+                list.get(parseInt(sub[1])).markAsDone();
+                System.out.println(line + tab + "Nice! I've marked this task as done: \n" +
+                        tab + list.get(parseInt(sub[1])) + "\n" + line);
+            } else if (next.contains("list")) {
+                System.out.print(line + tab + "Here are the tasks in your list: \n");
+                for (int i = 0; i < list.size(); i++) {
+                    System.out.println(tab + list.get(i));
+                }
+                System.out.print(line);
+            } else if (next.contains("todo")) {
+                Task toDo = new ToDo(next.replace("todo", ""));
+                list.add(toDo);
+                System.out.println(line + tab + "Got it. I've added this task:");
+                System.out.println(tab + toDo);
+                System.out.println(tab + "Now you have " + list.size() + " tasks in the list.\n" + line);
+            } else if (next.contains("deadline")) {
+                String deadline = next.split("/")[1];
+                String description = next.split("/")[0].replace("deadline ", "");
+                Task dlTask = new Deadline(description, deadline);
+                list.add(dlTask);
+                System.out.println(line + tab + "Got it. I've added this task:");
+                System.out.println(tab + dlTask);
+                System.out.println(tab + "Now you have " + list.size() + " tasks in the list.\n" + line);
+            } else if (next.contains("event")) {
+                String time = next.split("/")[1];
+                String description = next.split("/")[0].replace("event ", "");
+                Task eventTask = new Event(description, time);
+                list.add(eventTask);
+                System.out.println(line + tab + "Got it. I've added this task:");
+                System.out.println(tab + eventTask);
+                System.out.println(tab + "Now you have " + list.size() + " tasks in the list.\n" + line);
+            } else if (next.contains("delete")){
+                int index = Integer.parseInt(next.replace("delete" , "").trim());
+                Task deleted = list.remove( index - 1);
+                System.out.println(line + tab + "Noted. I've removed this task: ");
+                System.out.println(tab + deleted);
+                System.out.println(tab + "Now you have " + list.size()   + " tasks in the list.\n" + line);
+            } else {
+//                Task t = new Task(next);
+//                System.out.println(line + "     added: " + t.getDescription() + "\n" + line);
+//                list.add(t);
+                throw new DukeException("    ____________________________________________________________\n" +
+                        "     ☹ OOPS!!! I'm sorry, but I don't know what that means :-(\n" +
+                        "    ____________________________________________________________\n");
+            }
+            }
+        System.out.println(line + "     Bye. Hope to see you again soon!\n" + line);
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/DukeException.java b/src/main/java/DukeException.java
new file mode 100644
index 0000000000..8c0692258b
--- /dev/null
+++ b/src/main/java/DukeException.java
@@ -0,0 +1,5 @@
+public class DukeException extends Exception {
+    public DukeException (String exception) {
+        super(exception);
+    }
+}
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
new file mode 100644
index 0000000000..ec8036ae61
--- /dev/null
+++ b/src/main/java/Event.java
@@ -0,0 +1,14 @@
+public class Event extends Task {
+
+    protected String time;
+
+    public Event(String description, String time) {
+        super(description);
+        this.time = time;
+    }
+
+    @Override
+    public String toString() {
+        return "[E]" + super.toString() + " (" + time + ")";
+    }
+}
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
new file mode 100644
index 0000000000..845449ff06
--- /dev/null
+++ b/src/main/java/Task.java
@@ -0,0 +1,31 @@
+public class Task {
+        private String description;
+        private boolean isDone;
+
+        public Task(String description) {
+            this.description = description;
+            this.isDone = false;
+        }
+
+        public String getStatusIcon() {
+            if (isDone) {
+                return "\u2713";
+            } else {
+                return "\u2718";
+            }
+        }
+
+        public String getDescription() {
+            return description;
+        }
+
+        public String markAsDone() {
+            isDone = true;
+            return getStatusIcon();
+        }
+
+        @Override
+        public String toString() {
+            return "[" + getStatusIcon() + "] " + description;
+        }
+}
diff --git a/src/main/java/ToDo.java b/src/main/java/ToDo.java
new file mode 100644
index 0000000000..38788ba661
--- /dev/null
+++ b/src/main/java/ToDo.java
@@ -0,0 +1,11 @@
+public class ToDo extends Task {
+
+    public ToDo(String description) {
+        super(description);
+    }
+
+    @Override
+    public String toString() {
+        return "[T]" + super.toString();
+    }
+}