Branch a personality

src/main/java/lars/command/HelpCommand.java

@@ -0,0 +1,39 @@
+package lars.command;
+
+import lars.storage.Storage;
+import lars.task.TaskList;
+import lars.ui.Ui;
+
+/**
+ * Represents a command that displays a help message listing all available commands and their formats.
+ * This command guides the user on how to interact with the Lars application effectively.
+ */
+public class HelpCommand extends Command {
+
+    @Override
+    public void execute(TaskList tasks, Ui ui, Storage storage) {
+        this.response =
+                "Here are the commands you can use:\n\n"
+                        + "1. list\n\n"
+
+                        + "2. todo <description>\n"
+                        + "   👉Example:\n"
+                        + "     todo read book\n\n"
+
+                        + "3. deadline <description> /by <date>\n"
+                        + "   👉Examples:\n"
+                        + "     1. deadline submit report /by 2026-02-15\n"
+                        + "     2. deadline return library book /by 2026-02-15 1800\n"
+                        + "     3. deadline return library book /by Sunday\n\n"
+
+                        + "4. event <description> /from <start> /to <end>\n"
+                        + "   👉Example:\n"
+                        + "     event meeting /from 2pm /to 4pm\n\n"
+
+                        + "5. mark <number>\n"
+                        + "6. unmark <number>\n"
+                        + "7. delete <number>\n"
+                        + "8. remind (or press ⏰)\n"
+                        + "9. bye";
+    }
+}

src/main/java/lars/parser/Parser.java

@@ -6,6 +6,7 @@
 import lars.command.Command;
 import lars.command.DeleteCommand;
 import lars.command.ExitCommand;
+import lars.command.HelpCommand;
 import lars.command.ListCommand;
 import lars.command.MarkCommand;
 import lars.command.RemindCommand;
@@ -101,6 +102,10 @@ public static Command parse(String fullCommand) throws LarsException {
 
         case "remind":
             return new RemindCommand();
+
+        case "help":
+            return new HelpCommand();
+
         default:
             throw new LarsException("I'm sorry, but I don't know what that means :-(");
         }

src/main/java/lars/ui/Ui.java

@@ -29,9 +29,9 @@ public void printLine() {
     /**
      * Returns the welcome message shown to the user.
      */
-    // 在 Ui.java 中添加
     public String getWelcomeMessage() {
-        return "Hello! I'm Lars\nWhat can I do for you?";
+        return "Hello! I'm Lars 💛💜\nSo glad to see you\n"
+                + "You can type \"help\" to see what I can do 🧞‍";
     }
 
     /**