Optional | Java 8 Optional-like APIs for everyone
kandi X-RAY | Optional Summary
kandi X-RAY | Optional Summary
Only for API 24 (Nougat) and up. Support for primitive types. Yes, all of them except boolean. Only for int, double, and long. Support for functional use-cases. Yes, including filter(), flatMap(), etc.
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- Returns the value or the value if present
- Returns the value associated with this Supplier
- Returns the contained value or throws an exception if it is present
- Returns the contained value if present
- Returns the value that is present in this supplier
- Returns the value if present or the other
- Returns the contained value
- Returns the contained value or throws an exception if it is not present
- Returns the value that is present on this Supplier
- Returns value if present otherwise returns the value
- Returns the value of the Supplier if present
- Returns the value if present or otherwise
- Invokes the specified consumer if it is present
- Invokes the specified value if present
- Returns the value of this supplier or the one if present
- Checks if the given object is equal to or not
- Invokes the given function with the specified value if present
- Checks if the given object is equal to the given value
- Invokes the specified function if the value is present and if it is present invoke the provided function
- Returns the contained value or throws an exception
- Returns the contained value if present otherwise throws an exception
- Checks if the given object is equal to the given one
- Checks if two OptionalInts are equal
- Checks if the given object is equal
- Checks if the given object is equal to the given object
- Returns the contained value if present or throws an exception
Optional Key Features
Optional Examples and Code Snippets
Community Discussions
Trending Discussions on Optional
QUESTION
I am practicing regular expressions in Kotlin and trying to start with a multiline string. However, I am not receiving any matches. I feel like I am doing it right and can't figure out the problem.
Test lines:
...ANSWER
Answered 2021-Jun-15 at 21:32Here is how it works:
QUESTION
I have timecodes with this structure hh:mm:ss.SSS
for which i have a own Class, implementing the Temporal Interface.
It has the custom Field TimecodeHour Field allowing values greater than 23 for hour.
I want to parse with DateTimeFormatter. The hour value is optional (can be omitted, and hours can be greater than 24); as RegEx (\d*\d\d:)?\d\d:\d\d.\d\d\d
For the purpose of this Question my custom Field can be replaced with the normal HOUR_OF_DAY Field.
My current Formatter
...ANSWER
Answered 2021-Jun-11 at 11:06I think fundamentally the problem is that it gets stuck going down the wrong path. It sees a field of length 2, which we know is the minutes but it believes is the hours. Once it believes the optional section is present, when we know it's not, the whole thing is destined to fail.
This is provable by changing the minimum hour length to 3.
QUESTION
I have been trying to sort the Column values from A to Z which are populated in the List Box.
I have tried with the following but it does not adjust it. Any help will be appreciated.
...ANSWER
Answered 2021-Jun-15 at 18:37You need to sort the range using the Range.Sort method
QUESTION
We have thousands of structured filenames stored in our database, and unfortunately many hundreds have been manually altered to names that do not follow our naming convention. Using regex, I'm trying to match the correct file names in order to identify all the misnamed ones. The files are all relative to a meeting agenda, and use the date, meeting type, Agenda Item#, and description in the name.
Our naming convention is yyyymmdd_aa[_bbb]_ccccc.pdf
where:
- yyyymmdd is a date (and may optionally use underscores such as yyyy_mm_dd)
- aa is a 2-3 character Meeting Type code
- bbb is an optional Agenda Item
- ccccc is a freeform variable length description of the file (alphanumeric only)
Example filenames:
...ANSWER
Answered 2021-Jun-15 at 17:46The optional identifier ?
is for the last thing, either a characters or group. So the expression ([a-z0-9]{1,3})_?
makes the underscore optional, but not the preceding group. The solution is to move the underscore into the parenthesis.
QUESTION
I'm making a POC with Lumen and Vue.JS. For now it just has to send a "hello world" message from the Lumen back-end to the Vue.JS front-end (which works). I have made an event which is triggered upon loading the page like this:
...ANSWER
Answered 2021-Jun-15 at 16:42Fix composer.json
I have created an issue on the PHP package: https://github.com/pusher/pusher-http-php/issues/295
It is true this version is broken, but the fix should be in the composer.json
file. Mine looked like this:
QUESTION
I'm trying to follow the Google Style of docstrings, but I'm not sure how to document a function (and the class itself) when there's functions that add/supdates an attribute. Currently I have something like this:
...ANSWER
Answered 2021-Jun-09 at 00:25There is a general format that can be followed. Although in certain scenarios, it becomes necessary to break away from the traditional style, your situation seems to be fairly basic. Here is a PEP convention guide for docstrings in Python:
QUESTION
Trying to implement Azure WAF policy and associate with http listener the code was working fine until I try to include a new optional parameter called http_listener_ids
Tf code:
...ANSWER
Answered 2021-Jun-15 at 10:40The documentation for the azurerm_web_application_firewall_policy
resource is out of date but http_listener_ids
and path_based_rule_ids
are read only now (as of v2.55.0) so you can't set them and can only read them as an attribute of the resource.
QUESTION
I developed a policy, which allows to login with username and password (B2C user) or using the Microsoft account, connecting the AD as an OpenId Identiy provider. It works fine, but when I login with my Microsoft account, the email is not set:
I guess I have to set something in the following snippet:
...ANSWER
Answered 2021-Jun-15 at 09:10This will not work:
QUESTION
I need to parse a string quote by quote text and @ author and # category delimiters. Author and category come in order, but are optional. Like this:
...ANSWER
Answered 2021-Jun-15 at 08:42Assuming the @
and #
only appear at the end of string in front of the author or category, you can use
QUESTION
I am trying to contribute to a Github Page/Jekyll site and want to be able to visualise changes locally but when I run bundle exec jekyll serve
but I get this output:
ANSWER
Answered 2021-Feb-02 at 16:29I had the same problem and I found a workaround here at https://github.com/jekyll/jekyll/issues/8523
Add gem "webrick"
to the Gemfile in your website. Than run bundle install
At this point you can run bundle exec jekyll serve
For me it works!
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install Optional
You can use Optional like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Optional component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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