被Scanner坑坏了(纪念华为od笔试)

private static void expect() {
    System.out.println("请输入数字:");
    List<String> words = new ArrayList<>();
    Scanner in = new Scanner(System.in);
    int index = Integer.parseInt(in.nextLine());
    System.out.println("index = " + index);
    System.out.println("请输入字符串:");
    String nextLine = in.nextLine();
    System.out.println("nextLine = " + nextLine);
    words.add(nextLine);
    System.out.println("words = " + words);
}

请输入数字:
1
index = 1
请输入字符串:

private static void accident() {
    System.out.println("请输入数字:");
    List<String> words = new ArrayList<>();
    Scanner in = new Scanner(System.in);
    int index = in.nextInt();
    System.out.println("index = " + index);
    System.out.println("请输入字符串:");
    String nextLine = in.nextLine();
    System.out.println("nextLine = " + nextLine);
    words.add(nextLine);
    System.out.println("words = " + words);
}

请输入数字:
1
index = 1
请输入字符串:
nextLine = 
words = []