Efficient way to compare version strings in Java [duplicate]

Answer 1

Split them into arrays and then compare.

// check if two strings are equal. If they are return 0;
String[] a1;

String[] a2;

int i = 0;

while (true) {
    if (i == a1.length && i < a2.length) return -1;
    else if (i < a1.length && i == a2.length) return 1;

    if (a1[i].equals(a2[i]) {
       i++;
       continue;
    }
     return a1[i].compareTo(a2[i];
}
return 0;