Recent questions tagged java

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java - Encrypting and decrypting a file using CipherInputStream and CipherOutputStream

I've been trying to write an encrypted file in AES and decrypt it subsequently by using Cipher Streams provided ... help point out the problem? 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 wrong with this clone()?

I have written this clone method for when the parent of the Employee class is abstract and the clone() method in the ... ex) { return null; } } 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 different cards in a CardLayout?

I looked at a code example that used this code: cl.show(cardPanel, "" + (currentCard)); But when I use show ... ); frame.setVisible(true); } } 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 - Loading from JAR as an InputStream?

Is there a ClassLoader implementation I can use to load classes from an InputStream? I'm trying to load ... InputStream into a new ClassLoader. 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 - Basic code to display a pdf in an existing JPanel?

I have an existing interface that has a JPanel for displaying pdf files. It is important to display the pdf ... code (libraries) if possible? 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 - Inserting national characters into an oracle NCHAR or NVARCHAR column does not work

When inserting strings in an oracle database, some national characters are replaced with question marks, even ... inverted question mark. 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 - Joda time - all mondays between two dates

I am using Joda time api in a Spring 3.0 project for the very first time. Now I have a start and ... vague due to little experience with joda. 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 keyword internal implementation

How does JVM make sure threads acquire a lock after entering synchronized method of an 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 synchronized method - how does it work

I think I know this, but would like it confirming. Obviously the synchronized blocks other threads from ... it being synchronized. 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 - making jfilechooser show image thumbnails

I wanted to create a JFileChooser with thumbnail view of image files.So I subclassed FileView and in the method which ... if this is image } 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 jsoup handle meta refresh redirect

I have a problem using jsoup what I am trying to do is fetch a document from the url which will ... may use meta refresh redirect methods 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 - Linking thirdparty libs (libs.a) with NDK

I'm building an Android apk who uses some native libraries of a third party, these libs are in Static Object ... the native.c file compiled. 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 optimal number of Threads for parallel processing of data

Let's say I have a task with processing 1 million sentences. For each sentence, I need to do something with it ... at once, to be incorrect? 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 does Collections.binarySearch work?

I am trying to understand how Collections.binarySearch work in Java. I don't quite understand the output I get ... clarify the output I receive? 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 define index by several columns in hibernate entity?

Morning. I need to add indexing in hibernate entity. As I know it is possible to do using @Index ... references an unknown table: house 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 command-line argument for passing files to a program

How can I receive a file as a command-line argument? 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 - Log4j failing to send an email when logging an error

I enabled logging in my application, and I want to send logs error by email (gmail account). I: Set up a java ... any idea about that topic ??? 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 - Generating Custom Color Palette for Julia set

I need an algorithm or a method to generate a color palette to Color the Julia set images. When using the escape time ... Y,color.getRGB()); } } 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 Security SAML + HTTPS to another page

I created a project with Spring Security SAML. I need to write a code ... artifactResolutionProfile = new ArtifactResolutionProfileImpl(httpClient());...

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

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java - How to draw a continuous line with mouse on JavaFX canvas?

The code below results in a JavaFX Canvas that can be drawn on with the mouse pointer but skips some points, ... speeds as we go down. 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 - Recursive JSON view of an entity with one-to-many relationship in REST controller

I'm using SpringBoot and JPA to build a REST interface. Now, I have a strange JSON returned for the list of ... .. 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 - Log4j - Have multiple appenders write to the same file with one that always logs

I have a log4j appender defined like: log4j.logger.com.example = DEBUG, filelog log4j.appender.filelog=org.apache ... two different log 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 - How to wrap a List as top level element in JSON generated by Jackson

I am running into a problem where I am trying to include a List as the root node, but I can't seem ... me with a more elegant solution? 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 - Google Play Game Services: strange sign in behavior

Recently I've added Google Play Game Services support in my app (added BaseGameActivity and GameHelper), and it sign- ... can be wrong? 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 - JavaFx 8 - Scaling / zooming ScrollPane relative to mouse position

I need to zoom in / out on a scroll pane, relative to the mouse position. I currently achieve the zooming ... the ScrollPane that is easier? 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 - Control the classpath ordering of jars in WEB-INF/lib on Tomcat 5?

I have a legacy web app running in Tomcat 5.0. This web app has two jars in WEB-INF/lib, let's say Foo-2 ... for jars in WEB-INF/lib in Tomcat? 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 @OneToMany does not work with inheritance in Hibernate

@Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) public class Problem { @ManyToOne private Person person; } @Entity ... setup...) 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 memory and CPU usage

I would like to get the total physical memory, the CPU usage, and and the amount of memory being used. I ... free memory for the whole system. See Question&Answers more detail:os...

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

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