Recent questions tagged java

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java - Why does one arraylist change when a copy of it is modified

Its probably a very simple one but its' still confusing me! import java.util.ArrayList; public class Sample ... happen with primitives though! 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 - Calling an action using Ajax URL in Struts 2

I am trying to connect to my action class by using URL as below in Ajax. But its not going into my action ... >selecttag.jsp</result> </action> 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 - setRetainInstance not retaining the instance

I'm trying to use setRetainInstance() but it seems not working for me! =(. I simplified the problem to the ... How can I solve it? 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 - PrintWriter to print on next line

I have the following code to print a string(from a ResultSet) to a text file: PrintWriter writer = new PrintWriter( ... row2 row3 row4 row5 ... 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 - Maximum size of an array - Type mismatch: cannot convert from long to int

I see that the maximum size of an array can be only maximum size of an Int. Why does Java not allow an array of ... = new int[no];//error 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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252 views

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java - Use a ContextLoaderListener in accordance with DispatchServlet

I want to use both ContextLoaderListener (so that I can pass Spring Beans to my servlet) as well as DispatchServlet ( ... I do to avoid that? 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 display multiple lines in a JTable Cell

I would like to create a JTable like the below picture: Which java class will be used and possibly how? 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 - unable to refer library project android on updated adt

I want to integrate facebook library project to my project ... Steps i followed: 1.Imported facebook library ... from existing source" ); 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 - JFrame inside another JFrame

I have a game of chess. I have written 3 classes. 1st if for game. (chessboard, pieces, and so on) And ... app by JFrame. How to do that? 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 access environment variables from JSP page

How can I access environment variables from a JSP page? Does one of the implicit objects give access to ... ="${myEnvironment.machineName}"> See Question&Answers more detail:os...

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

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293 views

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java - Hadoop Pseudo-Distributed Operation error: Protocol message tag had invalid wire type

I am setting up a Hadoop 2.6.0 Single Node Cluster. I follow the hadoop-common/SingleCluster documentation. ... etc/hostname: marta-komputer 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 - Does a correctly synchronized program still allow data race?(Part I)

There are two conclusions from JLS: C1: If a program is free of data races, then all executions of the program ... give me such a code segment? 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 - Convert 16 bit pcm to 8 bit

I have pcm audio stored in a byte array. It is 16 bits per sample. I want to make it 8 bit per sample ... t important for the algorithm - right? 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 secure database connections usually implemented in JAR files?

I'm not a Java developer, but my client has hired one to update some JAR files on their site. Prior to doing so ... to run it, it will fail. 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 properties not @Autowired

I am trying to get a Spring-boot application going and I am not sure what I am doing wrong here. I ... not being populated in my Controller? See Question&Answers more detail:os...

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

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319 views

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java - How to make the ball bounce off the walls in JavaFX?

I am new to Javafx and I am creating a simple program. What I'm trying to achieve is get the ball to bounce ... (); } I appreciate the help. 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 - Apache Kafka LEADER_NOT_AVAILABLE

I'm running into an issue with apache Kafka that I don't understand . I subscribe to a topic in my broker ... after an error ? 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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606 views

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java - non-static method toString() cannot be referenced from a static context

Don't want any code, just want some sort of guidance. Would like to keep my academic integrity in tact ;) I keep ... " + Room.toString()); } } See Question&Answers more detail:os...

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

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139 views

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java - How to render a checkbox in a JTable?

This is my code to render a JTable and change the color of rows, but it doesn't show a checkbox in column 6, only ... ));} } } here is my screen 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 - Understanding Android Tight loops / Spin-On-Suspend error

I am developing a game on android, 'Space RPG' - currently only seeing this error pop up on most Galaxy ... remaining _AI.Ship.Velocity = vel; See Question&Answers more detail:os...

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

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164 views

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java - how to process in parallel and synchronously in spring integration?

Is it possible in Spring integration to keep the channels synchronous (get acknowledgement after sending the message) but ... , if so, how? See Question&Answers more detail:os...

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

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93 views

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java - How to close a ChromeDriver when running on Grid?

I am currently running my tests with RemoteWebDriver with Selenium Grid 2 through TestNG suites. This works fine with ... . But not for chrome. See Question&Answers more detail:os...

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

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98 views

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java - how to bind ArrayList to JList

i have a JList and an ArrayList.How to bind the datas in arraylist to the jlist.Are the any alternative methods? ... Now the code give an error. See Question&Answers more detail:os...

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

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101 views

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java - Is there a GCM registrationId pattern?

/** * @author Sebastien Lorber <i>([email protected])</i> */ public enum EnumDeviceType { ANDROID { ... or any other information... 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 improve image segmentation using the watershed?

I am developing an application to detect the lesion area, for this I am using the grabcut to detect the ... use watershed instead of grabcut? See Question&Answers more detail:os...

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

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183 views

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java - Putting an image in to a JFace table Cell is causing gap for image to appear in first column

So I have a problem, when I add an image to any column of a JFace table the first column also behaves like ... imageData); } return 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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154 views

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java - JSF tags not rendering - FacesServlet not working maybe?

I am just getting started with JSF 2.0 and I'm stuck on a problem at the very beginning. JSF tags are not ... true 06.Oca.2012 22:27:00 org.apache.myfaces.shared_impl.config.M...

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

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105 views

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java - How to get @WebMvcTest work with OAuth?

I just had hard time to get my controllers unit tests working because, IMO, what is in Spring doc is not ... please feel free to provide better. See Question&Answers more detail:os...

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

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