Recent questions tagged java

0 votes

200 views

1 answer

java - Creating a Christmas Tree using for loops

I am trying to make a christmas tree using for loops and nested for loops. For me to do that I need to be able to make a ... *** ***** ******* See Question&Answers more detail:os...

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

0 votes

291 views

1 answer

java - is getter method call to access variable better than direct variable access within a class

I am just curious to know if it advisable within a class instance to access the class variables using getter ... be generated in the jvm. See Question&Answers more detail:os...

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

0 votes

244 views

1 answer

java - How to detect if a variable has changed?

I have found myself wanting to do certain things in my programs only if a variable has changed. I have so ... better/simpler way of doing this? See Question&Answers more detail:os...

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

0 votes

251 views

1 answer

java - Send and receive serialize object on UDP

I am trying to send a serialized object from a server process to a client process in Java using UDP. The ... cannot receive the packet itself. See Question&Answers more detail:os...

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

0 votes

285 views

1 answer

java - FileInputStream and FileOutputStream to the same file: Is a read() guaranteed to see all write()s that "happened before"?

I am using a file as a cache for big data. One thread writes to it sequentially, another thread reads it ... . See also this related discussion. See Question&Answers more detail:os...

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

0 votes

188 views

1 answer

java - Setting time and date in JUnit test fixture

As part of Java code some task needs to be done tomorrow in JUnit. For example there are 3 tasks: task1 - done ... 's date as tomorrow in Java. See Question&Answers more detail:os...

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

0 votes

103 views

1 answer

java - Reducing JVM pause time > 1 second using UseConcMarkSweepGC

I'm running a memory intensive app on a machine with 16Gb of RAM, and an 8-core processor, and Java ... or advice would be greatly appreciated. See Question&Answers more detail:os...

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

0 votes

209 views

1 answer

java - Finding factors of a given integer

I have something like this down: int f = 120; for(int ff = 1; ff <= f; ff++){ while (f % ff ... I go about assigning variables to said factors? See Question&Answers more detail:os...

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

0 votes

135 views

1 answer

java - Android service android.os.BinderProxy error

I have been trying to get this android service working but I can not figure out why I am getting this error. 05 ... idea what I am doing wrong? See Question&Answers more detail:os...

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

0 votes

147 views

1 answer

java - ClassNotFoundException: org.eclipse.jetty.util.component.AbstractLifeCycle running inside jetty

I am having an issue running a servlet in jetty on Ubuntu 13.04. The server is installed using apt-get and ... am out of ideas? Thank you. See Question&Answers more detail:os...

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

0 votes

209 views

1 answer

java - Retrofit post using Firebase

Please any one please help. This is My API method @POST("/user/new.json") Call createUser(@Body User user); This is my call ... ................ See Question&Answers more detail:os...

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

0 votes

151 views

1 answer

java - How to keep HttpClient Connection Keep-Alive?

I am working HttpClient POST method. I need to create HttpClient once and should use Keep Alive Connection. But I ... out(1529): res a4 response See Question&Answers more detail:os...

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

0 votes

88 views

1 answer

java - Overriding interface's variable?

As I read from various Java book and tutorials, variables declared in a interface are constants and can't ... materials and understand it now. See Question&Answers more detail:os...

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

0 votes

171 views

1 answer

java - Unable to create the directory error

I created a new subdomain and uploaded the WAR file into its directory, but the server returns following ... .catalina.startup.Bootstrap start See Question&Answers more detail:os...

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

0 votes

135 views

1 answer

java - How to map custom collection in JPA?

I have problems in mapping custom collection with JPA (Hiberante provider). For example when I am using object ... Thanks for your attention! See Question&Answers more detail:os...

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

0 votes

94 views

1 answer

java - What exactly does comparing Integers with == do?

EDIT: OK, OK, I misread. I'm not comparing an int to an Integer. Duly noted. My SCJP book says: When == is ... ); Nope. It's false. What gives? See Question&Answers more detail:os...

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

0 votes

208 views

1 answer

java - Is there a helper to know whether a property has been loaded by Hibernate?

I need a helper to know whether a property has been loaded as a way to avoid LazyInitializationException. Is it ... .isLoaded(p.getChildList()); See Question&Answers more detail:os...

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

0 votes

243 views

1 answer

java - Is the defining classloader of a class level annotation always a parent of the initiating classloader of that class?

Suppose the following: @SomeAnnotation public interface Foo { } I would like to know if it is always the ... SomeAnnotation.class.getName())); See Question&Answers more detail:os...

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

0 votes

84 views

1 answer

java - JSch logger - where can I configure the level

How can I configure the level of JSch logger? Is it like Log4J configurable via XML? See Question&Answers more detail:os...

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

0 votes

94 views

1 answer

java - Create new log file daily using log4j

I want to use Log4j in my java project, which configuration should I provide in configuration file that every night ... me. Thanks in advance. See Question&Answers more detail:os...

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

0 votes

305 views

1 answer

java - Automatically size JPanel inside JFrame

I have a JPanel subclass on which I add buttons, labels, tables, etc. To show on screen it I use JFrame: ... of window even if it was resized? See Question&Answers more detail:os...

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

0 votes

365 views

1 answer

java - no enclosing instance of type... in scope

I investigate java inner classes. I wrote example: public class Outer { public Outer(int a){} public class ... explain me this situation? UPDATE See Question&Answers more detail:os...

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

0 votes

306 views

1 answer

java - what is the JDBC driver class name for mongodb?

Like com.mysql.jdbc.Driver in the case of mysql, what would be the JDBC driver class for mongodb? In java ... requires JDBC driver class name. See Question&Answers more detail:os...

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

0 votes

151 views

1 answer

java - Write RDD as textfile using Apache Spark

I am exploring Spark for batch processing. I am running the spark on my local machine using standalone mode. ... hook called Regards, Shankar See Question&Answers more detail:os...

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

0 votes

324 views

1 answer

java - How can ‘protected static’ variable of superclass be accessed in the subclass, where subclass resides in different package..?

Here is the slightly elaborated version of the same question. We cannot access protected variable (of the superclass) ... is this possible...? See Question&Answers more detail:os...

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

0 votes

168 views

1 answer

java - How to view/change socket connection timeout on Linux?

When creating a Socket in Java: new Socket(host, port); The Socket constructor will try to connect to host: ... this setting on Linux? Thanks See Question&Answers more detail:os...

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

0 votes

323 views

1 answer

java - JList - deselect when clicking an already selected item

If a selected index on a JList is clicked, I want it to de-select. In other words, clicking on the indices ... it. Is there a better way? See Question&Answers more detail:os...

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

0 votes

225 views

1 answer

java - How to change icon of a JLabel?

I have a jlabel to show a generated image. But it only works the first time. After that, imageicon of the ... . What could be the problem? See Question&Answers more detail:os...

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

Categories

Just Browsing Browsing

Most popular tags