[Xu JiaChen]iP

src/main/java/Duke.java

@@ -1,10 +1,96 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
 public class Duke {
-    public static void main(String[] args) {
-        String logo = " ____        _        \n"
-                + "|  _ \\ _   _| | _____ \n"
-                + "| | | | | | | |/ / _ \\\n"
-                + "| |_| | |_| |   <  __/\n"
-                + "|____/ \\__,_|_|\\_\\___|\n";
+
+    // Method to draw horizontal lines
+    public static void drawLine() {
+        for (int i = 0; i < 30; i++) {
+            System.out.print("_");
+        }
+        System.out.println();
+    }
+
+    // Method to print the logo and introductory message
+    public static void hiDude() {
+        // Logo string
+        String logo = "###            #        \n"
+                + "#  #           #        \n"
+                + "#  #  #  #   ###   ##   \n"
+                + "#  #  #  #  #  #  # ##  \n"
+                + "#  #  #  #  #  #  ##    \n"
+                + "###    ###   ###   ##   \n";
+
         System.out.println("Hello from\n" + logo);
+        drawLine();
+        System.out.println("Hello! I'm your best Dude :)");
+        System.out.println("What can I do for you?");
+        drawLine();
+    }
+
+    // Method to handle the storage of tasks
+    public static void storeDude() {
+        // Initialize Scanner and ArrayList for tasks
+        Scanner scan = new Scanner(System.in);
+        String input = scan.nextLine();
+        ArrayList<Task> tasks = new ArrayList<>();
+        int curPos = 0; // Variable to keep track of the current task position
+
+        // Main loop to process commands
+        while (!(input.isEmpty())) {
+            drawLine();
+            if (input.equals("bye")) {
+                byeDude();
+                break;
+            } else if (input.equals("list")) {
+                System.out.println("Here are the tasks in your list:");
+                for (int i = 0; i < curPos; i++) {
+                    System.out.println((i + 1) + ". " + tasks.get(i).getStatusIcon() + " " + tasks.get(i).description);
+                }
+            } else if (input.startsWith("mark") || input.startsWith("unmark")) {
+                // Split the input to separate command and task index
+                String[] arrOfInput = input.split(" ", 2);
+                if (arrOfInput.length < 2) {
+                    System.out.println("Please specify the task index.");
+                } else {
+                    try {
+                        // Convert user input index to zero-based index for ArrayList
+                        int index = Integer.parseInt(arrOfInput[1]) - 1;
+                        if (index < 0 || index >= curPos) {
+                            System.out.println("Task index out of range.");
+                        } else {
+                            // Mark or unmark the task
+                            tasks.get(index).isDone = input.startsWith("mark");
+                            String message = input.startsWith("mark") ? "Nice! I've marked this task as done:" : "OK, I've marked this task as not done yet:";
+                            System.out.println(message);
+                            System.out.println("   " + tasks.get(index).getStatusIcon() + " " + tasks.get(index).description);
+                        }
+                    } catch (NumberFormatException e) {
+                        System.out.println("Invalid task index format.");
+                    }
+                }
+            } else {
+                // Add new task
+                System.out.println("added: " + input);
+                tasks.add(new Task(input));
+                curPos++;
+            }
+            drawLine();
+            input = scan.nextLine();
+        }
+        // Close the Scanner to prevent resource leak
+        scan.close();
+    }
+
+    // Method to print the goodbye message
+    public static void byeDude() {
+        System.out.println("Bye. Hope to see you again soon!");
+        drawLine();
+    }
+
+    // Main method
+    public static void main(String[] args) {
+        hiDude();
+        storeDude();
     }
 }

src/main/java/Task.java

@@ -0,0 +1,17 @@
+public class Task {
+    // Instance variables to store task description and status
+    protected String description;
+    protected boolean isDone;
+
+    // Constructor to initialize a task with a description
+    public Task(String description) {
+        this.description = description;
+        this.isDone = false;
+    }
+
+    // Method to get the status icon based on whether the task is done or not
+    public String getStatusIcon() {
+        return (isDone ? "[X]" : "[ ]");
+    }
+}
+