Hello Buddies.
Sharing a small but useful piece of code, that can help you in handling version strings and comparisons in day-to-day coding.
Many a time, we struggle while comparing and transcoding the versions, which might take some time and can be frustrating as well.
So for my reference, I am keeping this snippet handy, and so is for you.
Check out the full project here, OR you may refer to the code shared below.
Happy Coding!
OUTPUT:
Sharing a small but useful piece of code, that can help you in handling version strings and comparisons in day-to-day coding.
Many a time, we struggle while comparing and transcoding the versions, which might take some time and can be frustrating as well.
So for my reference, I am keeping this snippet handy, and so is for you.
Check out the full project here, OR you may refer to the code shared below.
Happy Coding!
package versionCheckDemo;
/**
* @author namit
* @version 2.0
*
* re-checking-in for testing develop branch
*
* */
public class VersionTester {
public static void main(String[] args) {
System.out.println("Part 1 - Generalize the version numbers to a standard format - a.b.c");
String input = "1.1";
update(input);
input = "1.1.1";
update(input);
input = "1";
update(input);
System.out.println("Part 2 - Get the main digit representing the version number ");
input = "1.0.1";
findVersion(input);
input = "54.1";
findVersion(input);
input = "100";
findVersion(input);
input = "100.c.c";
findVersion(input);
input = "100.cc.&@!#$$";
findVersion(input);
System.out.println("Part 3 - Comparing the versions, under the format a.b.c ");
String versionX = "2.3";
String minVersion = "2.5.5";
checkVersion(versionX, minVersion);
versionX = "2.7.9";
minVersion = "2.5.5";
checkVersion(versionX, minVersion);
}
/**
* Method to update the version numbers to a uniform pattern
* */
private static void update(String input) {
System.out.println("incoming >> " + input);
int occurence = countMatches(input, '.');
if (occurence == 0)
input += ".0.0";
else if (occurence == 1)
input += ".0";
System.out.println("outgoing >> " + input);
System.out.println("---------------");
}
public static int countMatches(final CharSequence str, final char ch) {
if (null == str) {
return 0;
}
int count = 0;
char[] arr = ((String) str).toCharArray();
for (char c : arr) {
if (c == ch)
count++;
}
// likewise you can go for
// org.apache.commons.lang3.StringUtils.StringUtils.countMatches(str, ch)
// for saving time of writing the count logic
return count;
}
/**
* Method to find the main version number
* */
private static void findVersion(String input) {
System.out.println("Incoming >> " + input);
String inputWithoutDots = input.replace(".", "");
if (inputWithoutDots.matches("[0-9]+")) {
int version = 0;
String[] arr = input.split("\\.");
version = Integer.valueOf(arr[0]);
System.out.println("Success! outgoing >> " + version);
} else {
System.out.println("error!");
}
System.out.println("---------------");
}
/**
* Method to compare the given version with a minimum accepted version
* */
private static void checkVersion(String versionX, String minVersion) {
String minVersionFormatted = String.format("%-4s", minVersion.replace(".", "")).replace(' ', '0');
int minVersionNum = Integer.valueOf(minVersionFormatted);
String formattedVersion = String.format("%-4s", versionX.replace(".", "")).replace(' ', '0');
int versionXNum = Integer.parseInt(formattedVersion);
System.out.println("Min Version - "+minVersion);
System.out.println("You provided - "+versionX);
if (versionXNum >= minVersionNum) {
System.out.println("Version Accepted!");
} else {
System.out.println("Version Rejected!");
}
System.out.println("---------------");
}
}
OUTPUT:
Part 1 - Generalize the version numbers to a standard format - a.b.c
incoming >> 1.1
outgoing >> 1.1.0
---------------
incoming >> 1.1.1
outgoing >> 1.1.1
---------------
incoming >> 1
outgoing >> 1.0.0
---------------
Part 2 - Get the main digit representing the version number
Incoming >> 1.0.1
Success! outgoing >> 1
---------------
Incoming >> 54.1
Success! outgoing >> 54
---------------
Incoming >> 100
Success! outgoing >> 100
---------------
Incoming >> 100.c.c
error!
---------------
Incoming >> 100.cc.&@!#$$
error!
---------------
Part 3 - Comparing the versions, under the format a.b.c
Min Version - 2.5.5
You provided - 2.3
Version Rejected!
---------------
Min Version - 2.5.5
You provided - 2.7.9
Version Accepted!
---------------
