java8 | java8 in action | Continous Integration library
kandi X-RAY | java8 Summary
kandi X-RAY | java8 Summary
java8 in action
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Top functions reviewed by kandi - BETA
- Demonstrates how to run an async API
- Sequences a list of CompletableFutures .
- Filters the apple list from the inventory .
- Returns a string representation of this object .
- Parses a quote from a string .
- Sleep for 1 1000 seconds
- Print a hello message .
- apply a discount
- Test whether the apple is less than 50 .
- The main method .
java8 Key Features
java8 Examples and Code Snippets
Community Discussions
Trending Discussions on java8
QUESTION
I am trying to lambda Java8 lambda expressions, Wherein I came across this example. I am unable to understand the program flow,
The the below example when the factorialTailRec(1, 5).invoke() statement is called the program flow is as shown below:
The program first goes to the factorialTailRec method and once and checks if the number value is equal to 1. In the first iteration, it's not so it goes to the else part.
In the else block the flow is redirected towards the call method inside the TailCall class which will return the same object.
Now the invoke method is called and then the Stream object tries to iterate through the result. I am not getting how the factorialTailRec is called again? They say its because of the below statement,
...
ANSWER
Answered 2021-Jun-15 at 08:49The below code
QUESTION
I'm getting the following error running observeAsState
on a LiveData object after I upgraded Jetpack Compose to 1.0.0‑beta07.
ANSWER
Answered 2021-May-19 at 22:23Your runtime-livedata
dependency is outdated:
QUESTION
The maven build of our project fails with this error:
...ANSWER
Answered 2021-Jun-08 at 14:52Those Yubico guys uses version ranges:
QUESTION
I have a string like "name = mita and salary> 10000" . Out of which I need to get only name and salary attribute.I am going to have dynamic string on which i need the attribute before operator only. Like here I need to fetch name and salary attribute which r before = and > operator. I can have multiple condition of same type in the string. I can anyone please feasible way to fetch string before operator in Java8 Please find the example strings and expected output as below:
...ANSWER
Answered 2021-Jun-06 at 13:06You can make use of split
method of String
class and Regex
:
QUESTION
I'm trying to create BDD tests for a spring boot application that is written in java11, and using junit5 for tests.
I'm trying version 6.9.1 of cucumber and my dependencies for this part are:
...ANSWER
Answered 2021-Jan-16 at 12:15It's worth reading the introduction to JUnit 5. You are making a common mistake in thinking that JUnit 5 is a monolith. Rather:
https://junit.org/junit5/docs/current/user-guide/#overview-what-is-junit-5
Unlike previous versions of JUnit, JUnit 5 is composed of several different modules from three different sub-projects.
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage
Like JUnit Jupiter, Cucumber is a test engine using the JUnit Platform. Extensions are a concept from JUnit Jupiter and don't carry over to Cucumber.
Without a single example I could find in the cucumber documentation.
You'll not find anything in the main documentation until the JUnit 5 integration is feature complete. Until that time it is perfectly possible to use Cucumbers JUnit 4 integration with JUnit Vintage.
However if you're more experimentally minded you can use the documentation with the source code:
https://github.com/cucumber/cucumber-jvm/tree/main/junit-platform-engine
@CucumberOptions - there is an interface CucmberOptions which I can implement and return all required properties, but this feels like a step back from the parameterized annotation.
The Cucumber JUnit Platform integration defaults to scanning for glue and features on the class path root. If you follow the conventional maven/gradle/java project layout no additional configuration is needed.
So step definitions go in src/test/java/com/example
and features in src/test/resources/com/example
.
If you have a more complicated setup you should either wait and use JUnit4/Junit Vintage or simplify your setup.
QUESTION
I'm using java8
, SpringBoot 2
, and JPA2
and I'm run in a strange problem. Suppose the following code:
ANSWER
Answered 2021-Jun-01 at 13:13This is clearly mentioned in this post
Lets walkthrough your code.
QUESTION
Here are a few lines of code which I wrote to test hashmap's performance in a multi-threading environment. I know that hashmap may cause deadlock with java8, but I am using java 11. It does not throw any exception, and never stop. Can someone help me to understand why? Thank you.
Response is a very simple entity class.
...ANSWER
Answered 2021-May-27 at 18:54Java 11 implementation has not introduced thread-safe implementation of java.util.HashMap
.
In the JDK documentation, it is clearly stated that access to Hashmap
is NOT synchronized, so the behavior in a multithreaded application is unpredictable, and deadlock situation is indeed a possible side effect.
In addition, it is also said that if you want to have synchronized access, you MUST provide synchronization policy by using static method Collections.synchronizedMap
, this is the piece of code to realize that:
QUESTION
I am running the following tests to parse time in HH:mm am/pm format all 3 tests pass in Java 8 (1.8.0_282) but 2nd and 3rd test fail in latest Java 11_0_11 version, only the very simple test (first test without am/pm info) passed in Java 11. Also i am running Oracle JDK 11 as well as AdoptOpenJDK 11 with same results.
- My Main Requirement
I have incoming JSON payload containing (as strings) before and after times with am/pm information. I need to parse Local Time out of them and then compare the local times against each other to see if one is before the other.
...ANSWER
Answered 2021-May-26 at 17:21There are two problems in your code:
- You haven't used
Locale
withDateTimeFormatter
which is aLocale
-sensitive type. Never use SimpleDateFormat or DateTimeFormatter without a Locale. - You have used
H
instead ofh
for 12-hour format. The symbol,H
is used for 24-hour format.
Demo:
QUESTION
I am trying to data bind my project but I am getting this error in my Gradle file I am a beginner so let me know which files you need or what other information do you need more?
Data Binding annotation processor version needs to match the Android Gradle Plugin version. You can remove the kapt dependency androidx.databinding:databinding-compiler:7.1.0-alpha01 and Android Gradle Plugin will inject the right version.
build.gradle (:app)
...ANSWER
Answered 2021-May-25 at 12:52You need to delete this line of code kapt'androidx.databinding:databinding-compiler:7.1.0-alpha01'
and recompile. According to Google's open databinding document, the way to open databinding is:
QUESTION
I’m trying to integrate spark(3.1.1) and hive local metastore (3.1.2) to use spark-sql.
i configured the spark-defaults.conf according to https://spark.apache.org/docs/latest/sql-data-sources-hive-tables.html and hive jar files exists in correct path.
but an exception occurred when execute 'spark.sql("show tables").show' like below.
any mistakes, hints, or corrections would be appreciated.
...ANSWER
Answered 2021-May-21 at 07:25Seems your hive conf is missing. To connect to hive metastore you need to copy the hive-site.xml file into spark/conf directory.
Try
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Install java8
You can use java8 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 java8 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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