死代码java eclipse

我试图检查用户给出的单词是否已经存在于文本文件中,或者它的子字符串是否已存在.这是我的代码:

String ans = null;
Scanner scanner = null;
do
{
    System.out.print("Please enter a new word: ");
    String Nword = scan.next();
    System.out.print("And its appropriate Hint: ");
    String Nhint = scan.next();

    Word word = new Word(Nword , Nhint);
    File file = new File("C:\\Users\\Charbel\\Desktop\\Dictionary.txt");
    file.createNewFile();
    scanner = new Scanner(file);
    if (scanner != null)
    {
        String line;
        while (scanner.hasNext()) {
            line = scanner.next();
            for(int i = 0 ; i

Eclipse说else条件之后的语句是"死代码",我不知道为什么.