CODEWITHSUNDEEP
javastringversion
Faris Rehman
Faris Rehman

Reputation: 129

Comparing versions (strings)

I'm not sure as to how I'd go about comparing two version strings, and include support for "SNAPSHOT" in the version name.

An example: I have two version strings, "1.9.9" and "2.0.0". I want to return a boolean (true) if the second string is greater than the first string. I've used this: https://stackoverflow.com/a/6702029/1442718

It works perfectly.

However, an example like this won't work with that code: I have two version strings, "2.0.0-SNAPSHOT" and "2.0.0". Obviously the SNAPSHOT is one version behind 2.0.0, but this method won't pick it up and throw a NumberFormatException, instead of returning -1 which implies it is a version below.

Any suggestions? Thanks.

Upvotes: 0

Views: 220

Answers (1)

Turing85
Turing85

Reputation: 20185

You could use something like this:

[...]
boolean isSnapshot1 = str1.endsWith("SNAPSHOT");
boolean isSnapshot2 = str2.endsWith("SNAPSHOT");
[...]
if (...) { // if version-number are equal
    if (isSnapshot1 && !isSnapshot2) { // same versions, but first is snapshot
        return (1);
    }
    if { // same versions, but secont is snapshot
        return (-1);
    }
    // else { Neither or both are snapshots, versions are equals -> cannot distinguish their order
        return (0);
    // }
}
[...]

This should to the job.

Upvotes: 1

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