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public int compare (String version1, String version2) {
        
		String[] str1 = version1.split("\\.");
		String[] str2 = version2.split("\\.");

		int len1 = str1.length;
		int len2 = str2.length;

		int len =len1>len2?len1:len2;

		for(int i=0;i<len;i++){
			int val1 = i<len1?Integer.parseInt(str1[i]):0;
			int val2 = i<len2?Integer.parseInt(str2[i]):0;
			if(val1>val2){
				return 1;
			}else if(val1<val2){
				return -1;
			}
		}
		return 0;

    }