版本比较

public int compare (String version1, String version2) {
// write code here
String[] s1 = version1.split("[.]");
String[] s2 = version2.split("[.]");
int len = Math.min(s1.length, s2.length);
for (int i = 0; i < len; i++){
if(s1[i].equals(s2[i])) continue;
if(Integer.parseInt(s1[i]) > Integer.parseInt(s2[i])){
return 1;
}else if (Integer.parseInt(s1[i]) < Integer.parseInt(s2[i])){
return -1;
}else {
return 0;
}
}
//缺失子版本号的部分默认为0，所以长的更大
if(s1.length > s2.length){
return 1;
}else if(s1.length < s2.length){
return -1;
}
return 0;
}