Recent questions tagged Java

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java - Fastest way to read huge number of int from binary file

I use Java 1.5 on an embedded Linux device and want to read a binary file with 2MB of int values. (now ... change. (Smaller file for init) 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 - JSF: Accessing Bean from Validator via field

I have a JSF validator that checks whether a Container Number string conforms to the ISO-6346 specficiation. It ... . Much appreciated. D. 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 Library AAR depending on another library

Hi I have a Android Library Project which produces an AAR. All is good but when I use the AAR in another ... AAR as well when generating one? 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 are Integer arrays stored internally, in the JVM?

An array of ints in java is stored as a block of 32-bit values in memory. How is an array of ... every last ounce of performance matters? 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 error when using prepareStatement with interval in query

When running this query SELECT SYSDATE + INTERVAL '7' DAY FROM DUAL; in a prepareStatement like this ... statements together with interval? 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 - Hibernate : org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags

Entity classes Customer @Entity @Table(name="Custumer") public class Custumer implements Serializable { @Id @GeneratedValue ... relations in DB 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 - Generic Array Creation Compilation Error From Inner Class

I'm trying to implement a linked collection using generics, something like the following. public class A<E> { ... and leaves A with E#1. 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 stop editing with DefaultCellEditor when a separate JBtton is pressed

I got a table with a custom TableCellEditor (extending DefaultCellEditor) with a JFormattedTextField as the editor component ... good 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 - Why does worker node not see updates to accumulator on another worker nodes?

I'm using a LongAccumulator as a shared counter in map operations. But it seems that I'm not using it correctly ... I must start the task with? 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 - Eclipse pausing without a breakpoint

While debugging my project in Eclipse, it will (repeatably, at the same point in the code) pause execution ... could be causing this behaviour? 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 TextToSpeech.synthesizeToFile() file is not created

I am trying to implement a pause and play function to some text using tts and MediaPlayer. However, I can't seem to be ... ); } } }); 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 - Adding Schema name to entity in Spring data?

I am getting an error when using an Oracle DB and Spring Data. The error is: ORA-00942: table or view does ... ; //getters and setters etc... 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 program using int and double

I have written a simple Java program as shown here: public class Test { public static void main(String[] ... help me in understanding 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 - Casting node to element giving ClassCastException

here n2 is my NodeList, and i just want to see the first child node of my root element public void ClickMe( ... be cast to org.w3c.dom.Element 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 - Hibernate event listeners for JPA callbacks

How can I enable the Hibernate event listeners, that handle JPA callbacks? Currently I am using using ... ?) Object persist successfully 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 - Running akka with runnable jar

I'm trying to implement akka in java maven project with NetBeans. It runs fine when i run it from NetBeans but when I ... 1" port=10300 } } } } 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 - Better way to find matches in two sorted lists than using for loops?

I have two sorted lists, both in non-decreasing order. For example, I have one sorted linked list with elements [2,3 ... time less than O(n^2)? 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 conditional operator and different types

I have two methods in the Item Class: public void setValue(String v); public void setValue(Double v); and ... of conditional Operator. but why? 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 put component in bottom-right corner with GridBagLayout?

I need to display a single component within a JPanel, and I want to keep that component in bottom right corner ... What am I doing wrong here? 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 - RayCasting in Libgdx 3d

Alright so I've been trying for quite some time too Raycast in libgdx for 3d collision detection based on where ... me in the right direction? 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 - Choosing the correct JRE version in Gradle with Eclipse

I'm using Gradle with the Eclipse plugin to generate project files for my project, but I can't get it to ... such JRE is installed in Eclipse. 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 - SimpleDateFormat problems with 2 year date

I'm trying to understand two things: Why doesn't the following code throw an exception (since the SimpleDateFormat is ... 1.6.0_38-b05 on Ubuntu 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 - Aliases expected length is 0; actual length is 1 on hibernate query cache

String q1Str = "SELECT parent_id FROM meta WHERE st_id = "+childIds+";"; Query q1 = em.createNativeQuery(q1Str); / ... is 0; actual length is 1 See Question&Answers more detail:os...

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

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843 views

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java - XSSFSheet (Apache POI) sorting and filtering

I'm creating an autofilter on an XSSFSheet as follows: sheet.setAutoFilter(new CellRangeAddress(1, sheet.getLastRowNum() ... that? Thanks! Sam 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 - synchronized object not locked by thread before notifyAll()

I want to have a boolean to notify some sections of the system that a specific service started. For some ... locked inside a synchronized block? 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 copy some content in one .docx to another .docx , using POI without losing format?

Suppose I have two .docx files, input.docx and output.docx I need to select some of the content in input.docx and ... fos.flush(); fos.close(); See Question&Answers more detail:os...

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

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425 views

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java - How to set up Maven to override a settings file for another when running a test?

See the following Maven generated project target classes test-classes src main java scripts resources datasource-settings.xml ... get my goal ? See Question&Answers more detail:os...

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

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410 views

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java - What is TestSuite?

I am relatively new to Java and new to JUnit testing. It's absolutely clear to me what the Test class uis, ... explain me what TestSuite is for? See Question&Answers more detail:os...

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

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