Compare two version numbers version1 and version1.
If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.
You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not "two and a half" or "half way to version three", it is the fifth second-level revision of the second first-level revision.
Here is an example of version numbers ordering:
0.1 < 1.1 < 1.2 < 13.37
public class Solution { public int compareVersion(String version1, String version2) { String[] version1res = version1.split("\\."); String[] version2res = version2.split("\\."); int idx = Math.max(version1res.length, version2res.length); int i = 0; while(i < idx){ int index1 = i < version1res.length ? Integer.valueOf(version1res[i]) : 0; int index2 = i < version2res.length ? Integer.valueOf(version2res[i]) : 0; if( index1 < index2){ return -1; } else if(index1 > index2){ return 1; } i++; } return 0; } }