Recent questions tagged java

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java - Why is "a^=b^=a^=b;" different from "a^=b; b^=a; a^=b;"?

I tried some code to swap two integers in Java without using a 3rd variable, using XOR. Here are the two swap functions I ... =b; b^=a; a^=b; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the MariaDB dialect class name for Hibernate?

In Hibenate I am using MariaDB but I couldn't find the dialect class name of MariaDB . In Hibernate, MySQL5 ... dialect class name for MariaDB? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - VideoView black flash before and after playing

I have a VideoView which I want to use to play a movieclip. I use it like this to play it and it works. ... if it dissapears it will be okay. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Will a static block execute without the main method?

I'm trying to run the below code on my machine, but it didn't execute anything nor showing any errors. public class ... way, I'm using Java 7. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Total Number of Row Resultset getRow Method

Read the Following Code: public class selectTable { public static ResultSet rSet; public static int total=0; public ... is empty. Update me! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Stop a periodic task from within the task itself running in a ScheduledExecutorService

Is there a nice way to stop the repetition of task from within the task itself when running in a ... null in the reference.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Replacing unicode punctuation with ASCII approximations

I am reading some text files in a Java program and would like to replace some Unicode characters with ASCII ... /should I replace this?) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to convert buffered image to image and vice-versa?

Actually i am working on a image editing software and now i want to convert the buffered-image i.e : BufferedImage ... ? If yes, then how?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is List.iterator() thread-safe?

In Java: Is List.iterator() thread-safe, i.e. does the returned iterator reflect the current state of the list ... at the time of its creation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Running JavaFX application with JDK 11+

If I understand Oracle's announcments JavaFX won't be included to the JDK beginning with JDK 11 and will be ... be OpenJDK available via Gradle? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using request.setAttribute in a JSP page

Is it possible to use request.setAttribute on a JSP page and then on HTML Submit get the same request attribute in the Servlet? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What code is generated for an equals/hashCode method of a case class?

I have some Java code which I'm translating to Scala. The code consists of some immutable classes which would fit ... and equals to your class. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I run .class files on windows from command line?

I'm trying to run .class file from command line. It works when I manually move to the directory it's stored in, ... t the one I'm looking for)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why can I override a protected method with public method?

The Java compiler doesn't complain when I override a protected method with a public method. What's really ... method has lower visibility? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why is it legal to re-throw a Throwable in certain cases, without declaring it?

I would expect the following code to raise a compile-time error on throw t;, because main is not declared ... obscure corner-cases like this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do you programmatically configure hazelcast for the multicast discovery mechanism?

How do you programmatically configure hazelcast for the multicast discovery mechanism? Details: The documentation only supplies an example ... :54436 Dec 12, 2013 12:03:32 PM com...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to create an infinite Stream<E> out of an Iterator<E>?

Looking at the following class I've made: public class FibonacciSupplier implements Iterator<Integer> { private final ... should it be done? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to use the browser's (chrome/firefox) HTML/CSS/JS rendering engine to produce PDF?

There are nice projects that generate pdf from html/css/js files http://wkhtmltopdf.org/ (open source) https: ... browser to produce good pdfs) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to set a Spring Boot property with an underscore in its name via Environment Variables?

I want to set hibernate.format_sql in a Spring Boot app. I want to set it using environment variables. ... translated to hibernate.format.sql? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Calling equals on string literal

I just was tidying my code a bit and there was this piece: String saving = getValue(); if(saving != null ... though it makes the code shorter. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can PreparedStatement.addBatch() be used for SELECT queries?

Imagine that I have 100 SELECT queries that differ by one input. A PreparedStatement can be used for the ... database using their JDBC driver. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Changing cell color using apache poi

I'm using Apache POI to read data in a spreadsheet of part numbers. I look up the part number in our database, if ... e) { throw e; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Where to add .ebextensions in a WAR?

Scenario: AWS Elastic Beanstalk Java application .ebextensions currently placed in src/main/resources/.ebextensions ... a Java application? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to use TimerTask with lambdas?

As you hopefully know you can use lambdas in Java 8, for example to replace anonymous methods. An example can be ... any way to make it nicer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why is a serializable inner class not serializable?

The following code: public class TestInnerClass { public static void main(String[] args) throws IOException { ... the transient keyword exists. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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592 views

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java - context:component-scan" is not bound

Am new to spring and I know this question has been asked many times, but I had to ask it again. I guess,I have ... ="org.sri.proj"/> </beans> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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330 views

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java - How do I investigate the cause of a JVM crash?

One day ago, after a few months of normal working, our java app starts to crash occasionally with the following ... //www.wuala.com/ubear/public See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - spring: set property of one bean by reading the property of another bean?

Is it possible to set the property of one bean by reading the property of another bean? For instance, suppose I ... dependent List, not on B. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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