Compare Version Numbers, Java

Compare Version Numbers

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
/*
Input: version1 = "7.5.2.4", version2 = "7.5.3"
Output: -1

Input: version1 = "1.0.1", version2 = "1"
Output: 1
*/
class Rextester
{  
    public static void main(String args[])
    {
        System.out.println(compareVersion("1.2.1","1.3.5"));
    }
    public static int compareVersion(String version1, String version2) {
        String[] one = version1.split("\\.");
        String[] two = version2.split("\\.");
        
        int index=0;
        while(index<one.length && index<two.length){
            if(Integer.parseInt(one[index])>Integer.parseInt(two[index]))
                return 1;
            else if(Integer.parseInt(one[index])<Integer.parseInt(two[index]))
                return -1;
            else
                index++;
        }

while(index<one.length){
            if(Integer.parseInt(one[index])>0)
                return 1;
            index++;
        }
        while(index<two.length){
            if(Integer.parseInt(two[index])>0)
                return -1;
            index++;
        }
        
        return 0;
    }
}


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