Recent questions tagged Java

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java - DataInputStream.read() vs DataInputStream.readFully()

Im making a simple TCP/IP Socket app Whats the different between doing this: DataInputStream in = new DataInputStream( ... its the same thing? 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 - Getting 'Attempt to mutate notification' exception

My goal is to implement blue coloring of keywords written by user into JTextPane. This is how my ... something other than DocumentListener? 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 - HttpClient NoClassDefFoundError

I am trying to run a sample application from HttpClient 4.0.1. It is the file ClientMultiThreadedExecution.java ... in advance for your 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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java - Android: unable to start service intent: not found?

I know, I am not the first onbe with this problem, but I tried so many solutions, I have found ... course without this comment </application> 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 access model attribute in Javascript

I want to access a model attribute in Javascript. I use the following code: model.addAttribute("data", ... alert is displayed Error : 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 - Extending ByteBuffer class

Is there any way to create class that extends ByteBuffer class? Some abstract methods from ByteBuffer are package ... about 4 times faster. 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 - Should we always override equals?

When writing one's own classes, is it always necessary to override equals(Object o)? If I don't, will it ... variables point to the same object? 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 - FileFilter for JFileChooser

I want to restrict a JFileChooser to select only mp3 files. But, the following code allows all file types ... = fileChooser.getSelectedFile(); 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 - Why does DecimalFormat allow characters as suffix?

I'm using DecimalFormat to parse / validate user input. Unfortunately it allows characters as a suffix while parsing. ... input like "12abc"? 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 - Mockito object is not an instance of declaring class

I haven't touched Mockito for a while, and I have never used it extensively. But today in some new code ... mock(ResourceI18nConcern.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 - Difference between StandardTokenizerFactory and KeywordTokenizerFactory in Solr?

I am new to Solr.I want to know when to use StandardTokenizerFactory and KeywordTokenizerFactory? ... and KeywordTokenizerFactory? 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 - IllegalStateException within method with Response paramether

I wrote a simple class to test response reading entity method (if it works as I expect). But it didn't worked ... ; } What am I doing wrong? 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 - Transactional annotation error

When I put "@Transactional(readOnly=false)" annotation in my Service class I get the following error Description: The ... What is causing 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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288 views

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java - Setting up M2_REPO classpath

I have a few questions corresponding to this. What is M2_REPO? What does this command do? mvn -Declipse.workspace=< ... we need to do the above? 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 month number from month name

I have this. BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String monthName = br. ... monthName variable? 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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380 views

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java - Iterate through multiple collections in the same "for" loop?

I wonder if there's such a way to iterate thru multiple collections with the extended for each loop in java. So ... // do something ... 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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248 views

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java - Initializing array with values - should I explicitly instance the class or not?

I often see arrays being initialized like this: String[] array = new String[] { "foo", "bar", "baz" }; ... find anything about this in the web. See Question&Answers more detail:os...

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

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242 views

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java - Error in velocity and log4J

I built a webapp that works perfectly fine in my localhost (tomcat). But when I tried to deploy, velocity ... .core.StandardService.start(StandardService.java:448) at org.apache.ca...

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

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358 views

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java - How do I map different values for a parameter in the same @RequestMapping in Spring MVC?

Suppose I have: @RequestMapping(params = "action=nuovoprodotto") public ModelAndView nuovoProdotto( @RequestParam(value ... value combination? 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 we can get JPA EntityManager Flush work

my question is why flush doesn't work : public void ejbService(){ Customer c = em.find(Customer.class,1); c. ... .None); but still not work RGDS See Question&Answers more detail:os...

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

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279 views

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java - How to access the private variables of a class in its subclass?

This is a question I was asked in an interview: I have class A with private members and Class B extends A. I ... with the same value in class B. See Question&Answers more detail:os...

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

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386 views

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java - Android WebView Playing HTML5/h.264/mp4 Video, How to get at the MediaPlayer

I have an Activity which is a WebView. I have a WebChromeClient inside it. Inside that, there are several ... be helping. Thanks in advance. 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 - Jersey/Jackson: how to catch json mapping exception?

I would like to catch json mapping exception in my restful service in case input json is not valid. It throws ... want to catch this exception. See Question&Answers more detail:os...

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

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446 views

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java - error with serialization with protobuf

I'm trying to serialize a structure with protobuf. after many hours trying to figure out what I'm doing ... overridden by subclasses." 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 - How to enable query logging in Spring-data-elasticsearch

I use spring-data-elasticsearch framework to get query result from elasticsearch server, the java code like this: ... 't log the query. See Question&Answers more detail:os...

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

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465 views

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java - Button ClickListener is not working in LibGDX game

I am developing an Android game using LibGDX. There are 4 buttons in a menu screen, but the ClickListener of these ... of a button in LibGDX? See Question&Answers more detail:os...

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

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470 views

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java - Determine Number of Decimal Place using BigDecimal

I was interested to have the following getNumberOfDecimalPlace function: System.out.println("0 = " + Utils. ... "1" as result. See Question&Answers more detail:os...

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

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559 views

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java - Does the finally block execute if the thread running the function is interrupted?

If I have a function with a try/finally section, and the thread running it is interrupted while in ... before the interruption actually occurs? See Question&Answers more detail:os...

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

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