您可以获取您的号码并将其与列表中的所有号码进行比较。然后,如果部分差异比差异小,您可以将数字存储为结果。public class Home {public static void main(String[] args) { List<Integer> list = Arrays.asList(-1,-2,1,2,8,9,13); Scanner s = new Scanner(System.in); int number = s.nextInt(); int result = 0; int differencePartial; int difference = 1000; for (Integer i : list) { if (number > i) differencePartial = number - i; else differencePartial = i - number; if (differencePartial < difference) { difference = differencePartial; result = i; }}System.out.println(result);}}