Recent questions tagged java

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java - How does AWS Lambda serve multiple requests?

How does AWS Lambda serve multiple requests? I want to know is it a multi-thread kind of a model here as ... be created and how many threads. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Create URL from a String

It is a very basic question. But i am unable to find an answer in Java documentation and unable to test it as ... already in some class or not. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Set Value of Private Static Field

I want to set the value of a private field using reflection for unit testing. Problem is, that field is static. Here' ... didn't turn it up... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What's the point of package annotations?

I understand the purpose of class annotations, thanks to How and where are Annotations used in Java?. What is the ... of things could you do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the difference between creating a locale for en-US and en_US?

I have all my ResourceBundle values in a table and formatted as per requirement. I have to change the languages on ... correct way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Auto size height for rows in Apache POI

I am inputting values into a spreadsheet using Apache POI. These values have newlines, and I was able to use ... are always the correct height? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I include a dependency's test jar into a Maven project's deployment?

I have two projects, foo and foo-web under the com.example group. foo-web depends on foo. To be ... multiple times with different classifiers. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - get all (derived) interfaces of a class

java.lang.Class.getInterfaces returns all directly implemented interfaces ie doesn't walk the class tree to get all ... this already, any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring RestTemplate and generic types ParameterizedTypeReference collections like List<T>

An Abstract controller class requires List of objects from REST. While using Spring RestTemplate its not mapping it ... , any other solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Header in the response must not be the wildcard '*' when the request's credentials mode is 'include'

I'm using Auth0 for my user authentication to only allow logged in users to access a Spring (Boot) ... Control-Allow-Origin gets set: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Get XML only immediate children elements by name

My question is: How can I get elements directly under a specific parent element when there are other elements ... project is using. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Where is hex code of the "EOF" character?

As far as know in the end of all files, specially text files, there is a Hex code for EOF or NULL ... ?" Appreciate your time and consideration. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

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java - Failed to crunch file - Android studio (app:mergeDebugResources)

i am currentyl trying to implement Google ActivityRecognitionApi. However i get following errors: Error:Failed to crunch ... copy some files... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Are Locks AutoCloseable?

Are Locks auto-closeable? That is, instead of: Lock someLock = new ReentrantLock(); someLock.lock(); try { // ... } ... ... } ...in Java 7? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - NewStringUTF() and freeing memory

Should I free the allocated string after passing it to NewStringUTF()? I have some code similar to: char* test; ... free it. I'm confused. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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211 views

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java - Picasso image load callback

I want to use Picasso to load three consecutive images one on top of each other in a listview. Using the ... a situation using Picasso? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Setting the from name in a javax.mail.MimeMessage?

Currently, our application uses a javax.mail to send email, using javax.mail.MailMessage. We set the From headers ... the header name would be. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - how to show query while using query annotations with MongoRepository with spring data

I'm using MongoRepository in spring boot to access mongo: public interface MongoReadRepository extends MongoRepository< ... could somebody help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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197 views

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java - What is the significance of @javax.persistence.Lob annotation in JPA?

When should I use @javax.persistence.Lob annotation in JPA? What datatypes can be annotated by this annotation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Make private methods final?

Is it beneficial to make private methods final? Would that improve performance? I think "private final" doesn ... final Result doSomething() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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292 views

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java - How to make eclipse automatically add braces to an IF statement?

In Java the following is completely valid: if (x == null) Y(); else Z(); I personally don't like it at ... it add the braces to IF statements? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Wait until boolean value changes it state

I have a thread which wait for a boolean value to change like this: while(!value) { Thread.sleep(1000) } ... the boolean value changes it state? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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260 views

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java - What's the difference between String.matches and Matcher.matches?

What's the difference between String.matches and Matcher.matches? Is there any difference in terms of performance or other things? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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107 views

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java - Avoid NoSuchElementException with Stream

I have the following Stream: Stream<T> stream = stream(); T result = stream.filter(t -> { double x = getX ... null if there is no value present? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Kotlin calling non final function in constructor works

In Kotlin, it warns you when calling an abstract function in a constructor, citing the following problematic code: ... part of the super class. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Enum values().length vs private field

I have enumeration like this: public enum Configuration { XML(1), XSLT(10), TXT(100), HTML(2), DB(20 ... the fastest and more elegant solution? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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498 views

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java - SwingUtilities.invokeLater() vs EventQueue.invokeLater()

Are there any differences between EventQueue.invokeLater() and SwingUtilities.invokeLater()? Or is that the latter is ... the sake of design? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to test if a double is zero?

I have some code like this: class Foo { public double x; } void test() { Foo foo = new Foo(); // ... -by-zero exception in the future. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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