将由ArrayList的数字和单词组成的字符串转换为int java

import java.util.ArrayList;

public class ArrayListToStringToInt {
    public static void main(String[] args) {
        ArrayList<Object> list = new ArrayList<>();
        list.add(123);
        list.add("456");
        list.add("789");

        String str = listToString(list);
        int result = stringToInt(str);

        System.out.println("转换后的结果为：" + result);
    }

    public static String listToString(ArrayList<Object> list) {
        StringBuilder sb = new StringBuilder();
        for (Object obj : list) {
            if (obj instanceof Integer) {
                sb.append(obj);
            } else if (obj instanceof String) {
                String word = (String) obj;
                switch (word) {
                    case "zero":
                        sb.append(0);
                        break;
                    case "one":
                        sb.append(1);
                        break;
                    case "two":
                        sb.append(2);
                        break;
                    case "three":
                        sb.append(3);
                        break;
                    case "four":
                        sb.append(4);
                        break;
                    case "five":
                        sb.append(5);
                        break;
                    case "six":
                        sb.append(6);
                        break;
                    case "seven":
                        sb.append(7);
                        break;
                    case "eight":
                        sb.append(8);
                        break;
                    case "nine":
                        sb.append(9);
                        break;
                }
            }
        }
        return sb.toString();
    }

    public static int stringToInt(String str) {
        return Integer.parseInt(str);
    }
}