java-examples | Java examples - of Java SE features | Runtime Evironment library
kandi X-RAY | java-examples Summary
kandi X-RAY | java-examples Summary
A set of Java examples - of Java SE features (core Java) and techniques. The Java examples are related to the Java tutorials at tutorials.jenkov.com . Many of these Java examples will be hard to understand without the corresponding tutorial explaining the topic and the examples.
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- Main method
- Checks if the lock is involved in a deadlock
- Submits a subAgent to the foreground thread
- Submits an agent to the background thread
- Main entry point
- Do nothing
- Runs the lock
- Tries to lock the two threads
- Main thread
- Try to lock the two threads
- Main entry point
- Entry point for testing
- Continue executing the sub agent
- Main method to run a blocking queue
- Main method for testing
- The main entry point
- Runs the consumer
- The main loop
- Entry point for the application
- Test program
- Entry point for testing purposes
- Runs the main thread
- Run the main thread
- Main method for testing
- Entry point
java-examples Key Features
java-examples Examples and Code Snippets
Community Discussions
Trending Discussions on java-examples
QUESTION
Stream#empty
returns an empty sequential Stream
. From this tutorial, I learnt that an empty stream might be useful to avoid null pointer exceptions while callings methods with stream parameters. However, I am not able to think of an example that can help me understand this statement clearly.
ANSWER
Answered 2021-Apr-11 at 21:34Let's say you have a Stream
with a flatMap
operation containinig some logic, you want the possibility of calling Stream#empty
if some condition is met
QUESTION
Before we start allow me to just say that I know that it is possible to integrate Gstreamer into Android natively using C code as done in the Android Tutorials themselves.
This question is not related to simply just getting Gstreamer running on Android but rather running it on Android using the pre-existing native Java wrapper library gst1-java-core alongside JNA inside of Android Studio in a new Native project. However, if Native C code is the only way do let me know if you have tried and failed what I'm trying to do.
Lets begin.
System Information:
- OS: Linux Ubuntu 18.04
- Android Studio Version: 4.1.2
- Java version: 8
- SDK version: 30 (targetting API 21)
- NDK version: 21 (also tried 23)
- Testing Device: Samsung Galaxy Tab S6 Lite (even though haven't gotten there yet)
Process involved setting up a brand new project in Android Studio and choosing Native C++ as the Project Template followed by keeping everything else default including the toolchain. Once the project was built and finished it's Gradle business I did the usual git init and set it up in Git. Following that I downloaded and added the gst1-java-core-1.4.0.jar from the releases page to the "libs/" directly inside the "app/" folder.
Once I had done so I modified the build.gradle file in the app directory to match this Gradle Gist.
This was then naturally followed by a Gradle sync and when that had completed correctly I went to my MainActivity.java and added two lines of code total. First at the top:
...ANSWER
Answered 2021-Mar-12 at 00:33So it was my mistake not knowing enough about Android and the sub systems to know that even though Android is primarily developed in Java it does not support running Java "natively". This means that JNI is not relevant as according to Wikipedia JNI is:
In software design, the Java Native Interface is a foreign function interface programming framework that enables Java code running in a Java virtual machine to call and be called by native applications and libraries written in other languages such as C, C++ and assembly
So in saying that - because Android does not run a JVM but rather it runs Native C on a Linux Kernel this means that trying to integrate a "java wrapper" through the JNI is not currently possible on Android.
Because of this - the common solution and following Gstreamers official tutorials appears to currently be the only way to use Gstreamer in Android.
I only have myself to blame for thinking that everyone else had just "missed" JNI and gst1-java-core and that I somehow knew better than even the Gstreamer official website itself.
I felt like answering this question though because if anyone else goes down the wrong track I can now officially suggest to following the official tutorials and create an Android App with Native support so that you can compile and integrate the C code directly from Gstreamer and then make your app work like that.
I can currently say that following the above paragraph's advice resulted in me creating a working Android application with a Gstreamer live stream currently up and running using a custom pipeline. I'm not going to say it was easy; because it isn't; especially if you are not great at C programming. But it is definitely doable and the tutorials are good.
QUESTION
There are several comboboxes in my code which I fill with values via
...ANSWER
Answered 2021-Feb-01 at 10:47If you use combobox.setItems(items);
then ComboBox
will automatically create a ListDataProvider
out of those items, which means that you could the following
QUESTION
In my Vaadin (14.4.6) application I've got a CustomField
like this one: https://vaadin.com/components/vaadin-custom-field/java-examples
When I add a @Tag
annotation to my CustomField implementation, the label and error elements are gone.
This is how the HTML is like in Firefox without the @Tag
annotation:
This is how the HTML is like in Firefox with the @Tag
annotation:
Is there a way to set a custom tag name at a CustomField without losing the label and the error elements?
...ANSWER
Answered 2021-Jan-21 at 09:41The CustomField is linked to a webcomponent with the Tag vaadin-custom-field so if you add a tag it will use a different webcomponent, in your case chart-field.
Why do you want to change the tag?
QUESTION
This is the original piece of code:
...ANSWER
Answered 2020-Sep-22 at 13:15Collection::stream
does not return an Optional
, so you should not use flatMap
here. You should keep using map
on the optional.
.map(Collection::stream)
gives you an Optional>
. You seem to be trying to call the stream's map
and collect
methods on this. But you need to first call Optional.map
before you can do that.
You should also use Optional.ofNullable
if registration
could be null:
QUESTION
I try to get a ListView runnng with update after changing the listItems in Kotlin. The simple examples I find here are working as long as I stay inside the activity_main. But trying to change items in a function i do not get the defined adapter.
my code:
...ANSWER
Answered 2020-May-26 at 23:29Move the declaration for the adapter outside your onCreate
function. You should then be able to access it from myfkt()
QUESTION
with Vaadin 14.1.23 TextFields I would like to differentiate visually between red error messages (e.g. "This value is too big.") and yellow warnings (e.g. "System will round your input to two decimals."). And optionally maybe blue info messages.
Therefore I created a TextField with a validator like in this example ( https://vaadin.com/components/vaadin-text-field/java-examples/validation ): When you type "1" into the field with label "Min 2 characters" then the field gets red and shows an error: "Minimum 2 characters".
How about showing a (yellow) warning message like this?
What I tried is this: In the apply method of my validator I created a validation result with ErrorLevel WARNING like this:
...ANSWER
Answered 2020-Apr-26 at 19:44There is a way to achieve this effect.
First you need to create theme for vaadin-text-field
.
Create text-field-theme.css
file in frontend/styles
folder with content:
QUESTION
In Vaadin 8 you could set an icon on a Tab
(of TabSheet
):
ANSWER
Answered 2020-Mar-22 at 10:10That's possible. Use the constructor new Tab(Components...)
or add your icon using Tab#add(Component...)
. The components will be shown in header of tab. For example, you could pass a HorizontalLayout
that contains an icon and a text component.
Have a look at this Vaadin tab component demo, paragraph "Tabs with custom content".
QUESTION
with Vaadin 14(.1.19) comes this Time Picker component: https://vaadin.com/components/vaadin-time-picker/java-examples
This is how it looks like (when it's read-only):
How can I get this Time Picker to show the time centered like this (this is a screenshot of a manual manipulation in the browser (setting text-align:center directly at the embedded input field), not a programmed solution)?
I tried to set the text-align property in the Java code without effect:
...ANSWER
Answered 2020-Mar-18 at 15:54You will need to change the CSS within the shadow DOM of TimePicker
's TextField
value part, we use theme attribute as additional selector in order to not to theme all the text fields:
QUESTION
ANSWER
Answered 2020-Mar-11 at 18:10This has nothing to do with the allMatch
, and everything to do with the fact that all arguments to a method get evaluated before that method is called, under all circumstances. All arguments to Stream.of
, in this particular case, get evaluated before Stream.of
is called.
If you really wanted something different, the closest thing to the behavior you want would look like
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You can use java-examples 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 java-examples 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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