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private static void expect() {
    System.out.println("ÇëÊäÈëÊý×Ö:");
    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("ÇëÊäÈë×Ö·û´®:");
    String nextLine = in.nextLine();
    System.out.println("nextLine = " + nextLine);
    words.add(nextLine);
    System.out.println("words = " + words);
}

ÇëÊäÈëÊý×Ö:
1
index = 1
ÇëÊäÈë×Ö·û´®:

private static void accident() {
    System.out.println("ÇëÊäÈëÊý×Ö:");
    List<String> words = new ArrayList<>();
    Scanner in = new Scanner(System.in);
    int index = in.nextInt();
    System.out.println("index = " + index);
    System.out.println("ÇëÊäÈë×Ö·û´®:");
    String nextLine = in.nextLine();
    System.out.println("nextLine = " + nextLine);
    words.add(nextLine);
    System.out.println("words = " + words);
}

ÇëÊäÈëÊý×Ö:
1
index = 1
ÇëÊäÈë×Ö·û´®:
nextLine = 
words = []