[T3A4][T17-A3]Sin Yu Fan

src/seedu/addressbook/Main.java

@@ -106,6 +106,9 @@ private void recordResult(CommandResult result) {
     private CommandResult executeCommand(Command command)  {
         try {
             command.setData(addressBook, lastShownList);
+            if(!storage.fileExists()) {
+            	ui.showFileDoesNotExistMessage(storage.getPath());
+            }
             CommandResult result = command.execute();
             storage.save(addressBook);
             return result;

src/seedu/addressbook/storage/StorageFile.java

@@ -145,4 +145,8 @@ public String getPath() {
         return path.toString();
     }
 
+	public boolean fileExists() {
+        return path.toFile().exists();
+	}
+
 }

src/seedu/addressbook/ui/TextUi.java

@@ -166,4 +166,9 @@ private static String getIndexedListItem(int visibleIndex, String listItem) {
         return String.format(MESSAGE_INDEXED_LIST_ITEM, visibleIndex, listItem);
     }
 
+	public void showFileDoesNotExistMessage(String path) {
+		showToUser("File has been deleted, creating new file at " + path);
+
+	}
+
 }