java比较客户端版本号

public class CompareVersion {

    public static void main(String[] args) {
        System.out.println(compareVersion("2.0.0", "2.0.1"));
    }

    public static int compareVersion(String version1, String version2) {
        if (version1.equals(version2)) {
            return 0;
        }
     
        String[] version1Array = version1.split("\\.");
        String[] version2Array = version2.split("\\.");
     
        int index = 0;
        int minLen = Math.min(version1Array.length, version2Array.length);
        int diff = 0;
     
        while (index < minLen && (diff = Integer.parseInt(version1Array[index]) - Integer.parseInt(version2Array[index])) == 0) {
            index ++;
        }
     
        if (diff == 0) {
            for (int i = index; i < version1Array.length; i ++) {
                if (Integer.parseInt(version1Array[i]) > 0) {
                    return 1;
                }
            }
     
           for (int i = index; i < version2Array.length; i ++) {
               if (Integer.parseInt(version2Array[i]) > 0) {
                 return -1;
               }
           }
       
           return 0;
       } else {
           return diff > 0 ? 1 : -1;
       }
    }
    
}