BM22 比较版本号

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 比较版本号
     * @param version1 string字符串
     * @param version2 string字符串
     * @return int整型
     */
    public int compare (String version1, String version2) {
        String[] str1 =  version1.split("\\.");
        String[] str2 =  version2.split("\\.");
        int maxLength = str1.length > str2.length ? str1.length : str2.length;
        // 补0对齐
        List<String> list1 = new ArrayList<String>(Arrays.asList(str1));
        for (int i = list1.size(); i < maxLength; i++) {
            list1.add("0");
        }
        List<String> list2 = new ArrayList<String>(Arrays.asList(str2));
        for (int i = list2.size(); i < maxLength; i++) {
            list2.add("0");
        }
        for (int i = 0; i < maxLength; i++) {
            String val1 = list1.get(i);
            String val2 = list2.get(i);
            if (Integer.parseInt(val1) < Integer.parseInt(val2)) {
                return -1;
            } else if (Integer.parseInt(val1) > Integer.parseInt(val2)) {
                return 1;
            }
        }
        return 0;
    }
}