Input: version1 = "0.1", version2 = "1.1" Output: -1
  
Input: version1 = "7.5.2.4", version2 = "7.5.3" Output: -1

public int compareVersion(String version1, String version2) {         String[] levels1 = version1.split("\\.");         String[] levels2 = version2.split("\\.");           int length = Math.max(levels1.length, levels2.length);         for (int i = 0; i < length; i++) {             Integer v1 = i < levels1.length ? Integer.parseInt(levels1[i]) : 0;             Integer v2 = i < levels2.length ? Integer.parseInt(levels2[i]) : 0;             int compare = v1.compareTo(v2);             if (compare != 0) {                 return compare;             }         }           return 0;     }
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