Add Delete feature

There is no option to delete a task from the list.

Add delete feature for users to remove a task.

src/main/java/Jarvis.java

@@ -0,0 +1,93 @@
+import java.util.Scanner;
+import java.util.List;
+import java.util.ArrayList;
+
+public class Jarvis {
+    public static void main(String[] args) {
+        Scanner inputScanner = new Scanner(System.in);
+
+        String userInput;
+        String introduction = "Hello! I'm Jarvis \n"
+                            + "What can I do for you?";
+        String farewell = "Bye. Hope to see you again soon!";
+
+        List<Task> taskList = new ArrayList<>();
+
+        System.out.println(introduction);
+
+        while (true) {
+            //receive user input
+            userInput = inputScanner.nextLine();
+            //check if userinput is bye, break if true
+            if (userInput.equals("bye")) {
+                break;
+            }
+            //if userinput equals list, return task list
+            if (userInput.equals("list")) {
+                System.out.println("Here are the tasks in your list:\n");
+                for (int i = 0; i < taskList.size(); i ++) {
+                    if (taskList.get(i) == null) {
+                        break;
+                    }
+                    System.out.println((i + 1) + ". " + taskList.get(i).toString());
+                }
+                continue;
+            }
+            //if userinput equals mark, check which task and mark it
+            if (userInput.length() > 4 && userInput.substring(0, 4).equals("mark")) {
+                int toMark = Integer.parseInt(userInput.substring(5)) - 1;
+                taskList.get(toMark).mark();
+                String markResponse = "Nice! I've marked this task as done:\n ";
+                System.out.println(markResponse + taskList.get(toMark).toString());
+                continue;
+            }
+            //if userinput equals unmark, check which task and unmark
+            if (userInput.length() > 6 && userInput.substring(0, 6).equals("unmark")) {
+                int toMark = Integer.parseInt(userInput.substring(7)) - 1;
+                taskList.get(toMark).unmark();
+                String markResponse = "Ok, I've marked this task as not done yet:\n ";
+                System.out.println(markResponse + taskList.get(toMark).toString());
+                continue;
+            }
+            //if userinput equals delete, check which task and delete
+            if (userInput.length() > 6 && userInput.substring(0, 6).equals("delete")) {
+                int toDelete = Integer.parseInt(userInput.substring(7)) - 1;
+                Task deleteTask = taskList.get(toDelete);
+                taskList.remove(toDelete);
+                String deleteResponse = "Noted. I've removed this task:\n ";
+                System.out.println(deleteResponse + deleteTask.toString());
+                continue;
+            }
+
+            //if userinput equals to do add new to do task to list
+            if (userInput.length() > 4 && userInput.substring(0, 4).equals("todo")) {
+                taskList.add(new ToDo(userInput));
+                System.out.println("Got it. I've added this task:\n " + taskList.get(Task.count - 1)
+                        + "\nNow you have " + (Task.count) + " tasks in the list.");
+            }
+
+            //if userinput equals deadline add new deadline task to list
+            if (userInput.length() > 8 && userInput.substring(0, 8).equals("deadline")) {
+                int divisor = userInput.indexOf("/by");
+                String description = userInput.substring(9, divisor - 1);
+                String date = userInput.substring(divisor + 4);
+                taskList.add(new Deadline(description, date));
+                System.out.println("Got it. I've added this task:\n " + taskList.get(Task.count - 1)
+                        + "\nNow you have " + (Task.count) + " tasks in the list.");
+            }
+            //if userinput equals event add new event task to list
+            if (userInput.length() > 7 && userInput.substring(0,5).equals("event")) {
+                int divisor = userInput.indexOf("/at");
+                String description = userInput.substring(6, divisor - 1);
+                String date = userInput.substring(divisor + 4);
+                taskList.add(new Event(description, date));
+                System.out.println("Got it. I've added this task:\n " + taskList.get(Task.count - 1)
+                        + "\nNow you have " + (Task.count) + " tasks in the list.");
+            }
+        }
+
+        System.out.println(farewell);
+
+
+    }
+}

src/main/java/JarvisException.java

@@ -0,0 +1,2 @@
+public class JarvisException {
+}