Merge pull request #139 from wendelinwemhoener/disallow-empty-flashcard-back

Disallow empty flashcard back

Author: wendelinwemhoener

data/flashcards/flashcard.txt

@@ -1,6 +1,8 @@
 3 | cs2113 | software enginnering | 3 
 5 | Hello | Duke | 4 
-7 | Hello | Duke | 5 
-9 | id | checker | 5 
+7 | Hello | Duke | 4 
+9 | id | checker | 6 
 10 | id increases | correctly | 5 
-11 |    f  | dfdf | 5 
+11 | f | dfdf | 5 
+12 | dfdf |  | 5 
+13 | 1 | j | 5 

src/main/java/seedu/duke/flashcard/command/CreateFlashcardCommand.java

@@ -35,6 +35,14 @@ public void execute(Scanner scanner, FlashcardList flashcardList) {
         System.out.print("    Enter the back page text: ");
         String backPageText = scanner.nextLine();
 
+        while (backPageText.strip().equals("")) {
+            System.out.println("        Invalid input! The back text must " +
+                    "contain at least one letter or digit!");
+
+            System.out.print("    Enter the back page text: ");
+            backPageText = scanner.nextLine();
+        }
+
         Flashcard flashcard = new Flashcard(frontPageText, backPageText);
 
         flashcardList.add(flashcard);