Recent questions tagged Java

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java - Solving a Linear Diophantine Equation(see description for examples)

Let me start off by clarifying that(before you guys dismiss me), this is not a homework problem and I'm not ... code will also do. Thanks much. 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 - Using Jena to create a SPARQL query on DBpedia

Im trying to create a SPARQL query using Jena to query DBpedia. The query is working when I use it with ... ideas what I'm 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 - what is the best way to edit csv file

I have a incomplete csv file that needs to be accurately updated, so there is csv file like this : one,two, ... don't know how to program 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 - Can we enable or disable Aspect based on value of any flag or through configuration file?

I have added following dependency in pom.xml <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</ ... How can I 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 - `if` condition efficiency

I'm working on improving the performance of a Java program. After I've improved the data structures and the ... the second is less readable) 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 - ListView using custom cell factory doesn't update after items deleted

I'm learning JavaFX and i wanted to create a cell factory which is working properly until i want to delete ... Any help is greatly appreciated. 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 delete older rolled over log4j2 logs, keeping up to 10 files?

What I want is: Maximum of 10 log files, in total Each log file, not more than 50MB in size. Thus the ... /Configuration> 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 - Jfreechart - Refresh a chart according to changing data

I would like to know how to refresh a chart if we want to change "in live" some piece of data. I ... and to rebuild the whole chart. 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 is 1000 times slower than sql query

I have this setup @Table(name ="A") EntityA { Long ID; List<EntityB> children; } @Table(name ="B") ... to native SQL query through Hibernate. 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 - Fatal Exception: android.view.WindowManager$BadTokenException Unable to add window -- token is not valid; is your activity running?

I know this question is discussed several time but believe me i never got any answer working. In my Main ... 7 Device states 4% background 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 - jpa constructor expressions with multiple SELECT NEW statements

Is there a way to have multiple SELECT NEW statements in a jpql query (Hibernate)? This works for me: @Query ... >,List<ItemServiceDTO>>> map; 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 swapping integer variable by XOR doesn't work in a single line?

I want to swap the value of two integer variables in java using the XOR operator. This is my code: int i = 24 ... zero! What's wrong with Java? 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 get view for an item in listview in android?

Is it possible to get an item view based on its position in the adapter and not in the visible views in ... relative to the visible items. See Question&Answers more detail:os...

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

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438 views

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java - Hibernate 4: persisting InheritanceType.JOINED discriminator column values

I have a simple JOINED hierarchy of documents: CREATE TABLE Documents ( id INTEGER NOT NULL, discriminator ENUM(' ... as a regular column. 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 tell a Client where the new Redis master is using Sentinel

Ok, I feel like I'm missing some crucial piece of information. Locally I have 1 master and 1 slave redis ... code know this and auto switch? 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 - Recurring AsyncRequestTimeoutException in Spring Boot Admin log

I'm currently running Spring Boot Admin on my local machine for testing purposes and I'm getting the following error nonstop ... ) [na:1.8.0_40] 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 - Firebase android proxy setting

I have made an android app https://play.google.com/store/apps/details?id=com.confesco.maggi which works with ... this problem.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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264 views

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java - Jersey Async ContainerRequestFilter

I have a Jersey REST API and am using a ContainerRequestFilter to handle authorization. I'm also using ... for proceeding still welcome. 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 - LogBack default charset for LayoutWrappingEncoder?

The Logback 1.1.3 LayoutWrappingEncoder documentation doesn't indicate what the default charset will be if the ... specified a charset? 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 tell number of rows changed from JDBC execution

I'm uncertain as to how to get the number of rows affected from a SQL execution. I do like this: boolean ... of this SO question. :-( 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 - Create a Timestamp without timeZone

How can I create a java.sql.timestamp without timezone (i′m getting 2007-09-23T10:10:10Z and I pretend 2007-09- ... of 2007-09-23T10:10:10 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 boot Jpa: hibernate as default?

if one uses the spring-boot-starter-data-jpa dependency and extends repository classes by org.springframework.data. ... What is the difference? See Question&Answers more detail:os...

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

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299 views

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java - JAVAH can't find class( android ndk)

I need a help in javah and android-ndk. I tryed to generate H-file for my native method, but javah said ... . Could anybody help me, please? 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 read all bytes together via Bluetooth?

I have an application that uses the bluetooth to receive some data (bytes) from other device. everything is going ... all the bytes together?! 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 - Postgres Exception : No results were returned by the query.

I am trying to insert some rows in to a table... I am using postgressql-7.2.jar. I get the following exception ... some one help me out in 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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287 views

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java - Ensure minimal coverage on new Subversion commits

We have a massive project with almost no unit tests at all. I would like to ensure from now on that ... , or something equivalent. Thoughts? 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 - Copying one class's fields into another class's identical fields

I have this question. But it will be difficult for me to explain as I don't know exact terms to use. Hope ... a way to achieve this. 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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641 views

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java - no grouping separator char for DecimalFormat

DecimalFormat uses ',' as the default grouping separator character. What is the correct way to tell ... any grouping separator char? See Question&Answers more detail:os...

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

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