Recent questions tagged Java

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java - Private constructor to avoid race condition

I am reading the book Java Concurrency in Practice session 4.3.5 @ThreadSafe public class SafePoint{ @GuardedBy("this ... what's the trick 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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java - Hidden performance cost in Scala?

I came across this old question and did the following experiment with scala 2.10.3. I rewrote the Scala ... the scala version? Many 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 - cannot start jstatd due to permission error

I try to run jstatd jvm monitoring tool on linux machine jboss@hostAddr:/usr/java/jdk1.6.0_18/bin> uname -a Linux ... 20.1-b02, mixed mode) 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 lazy-load application design

I tend to use Hibernate in combination with Spring framework and it's declarative transaction demarcation capabilities (e ... and sorry for WoT) 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 - ObjectInput and Output streams are not being accepted by client/server

I have one program with two serverside processes. One server just sends an ArrayList to client. The other server first takes ... .exit(1); } } } 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 maps static map polyline passing through lakes, river, mountains

My program uses google maps directions for web Services to find a route between two points. The ... 2276606&zoom=13&size=1024x1024&sensor=false 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 - Creation of QName takes default namesapce prefix rather than the provided parameter

I am using the JaxB Marshalling to create the XML. My XML I have few custom fields which I am creating ... JAXB Annotations Dependencies END --> 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 - testEquals(), testHashCode() and testToString()

I prepared short Java class. Could anyone show me how write voids: testEquals, testHashCode, testToString for this code in ... " + voted; } } 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 - Read special symbols from file

I am trying to read file using Java and the file also containing special characters also. I am trying to ... to read special character 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 - int [] cannot be converted to int

I want to use a 2D array for a gradebook method, where it has the student names, then the exam scores. In ... int[] cannot be converted to int. 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 text from dynamically added jPanel

I am adding dynamically subPanel to jPanel1 (with jTextField and jButton). Some of part code was borrowed from ... will be 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 - Show JDBC ResultSet in HTML in JSP page using MVC and DAO pattern

I'm implementing MVC using JSP and JDBC. I have imported a database class file to my JSP file and I would like ... HTML. How can I achieve 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 - The method finalize() from the type Object is not visible?

I tried the following code in a main method of a class that I wrote: public static void main(String[] args){ .. ... its own? Am I wrong anyway? 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 - Oracle 10g accepting 5 digit year in a Date

I managed to enter the date 21-Feb-12017 (I know it's not a correct date) in Oracle 10g into a date column ... Feb-21019 instead of 21-Feb-4581. 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 - App freezes after PreferenceSwitch in settings Android Studio

I made settings activity from Android Studio, not manually. I want to make a switch that applies a dark mode in the app ... .getClass())); } }); 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 - PDFBox Pdf to Image losing QR Code "ColorSpace Pattern doesn't provide a non-stroking color"

Similar to this SO PDFBox - PDF to Image losing barcode The PDF in question: https://drive.google.com/file/d/ ... an image using Java or PDFBox? 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 - Auto Populate a jTextField with NetBeans

I have created a jFrame using NetBeans that opens when a button on the main GUI is clicked to add a new ... populated with the current date. 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 adding color to row based on column value

I need to add color to row and column based on pnl value. How can I change the color of the row and how do ... .setScene(scene); stage.show(); } 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 - Is there a way to use a single example file for all cucumber test?

We are currently using multiple examples but they all contain the same examples. We are looking for a way to use the ... .getMessage()); } }; } 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 - Formatting the output of arrays, into a column

I just needed some assistance on formatting the output into a specific fashion. I satisfied all the requirements of the ... " "); } } } 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 - add scrollbar to JFreeChart 3DBarChart

Can I add a scroll bar to the JFreeChart that allows me horizontally move the bar ? JFreeChart chart = ChartFactory ... sample code. Thank you! 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 - Large table in table cell invoke page break

I have single PdfPTable with single column. One page fit 50 rows. If I add some text data to table (for an example ... ps itext version - 2.1.7 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 Arabic Letters Are Not Inserting In Database?

I am helping to one of my friend. He is creating web-application using JSF 2.0 & mysql. While creating ... someone help what is going ODD? 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 - Set component at center of the page

How can I set a component (say button) at center of the panel? I used Flowlayout with layout constraint as ... -center position of the panel. 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 - KeyListener not working

public class KL implements KeyListener { public static void main(String[] args) { final JPopupMenu popup = new ... comes up on the console. 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 - parse recursive nested field using jackson

I have a below JSON and from which I need to make a Map<String, String>. In the below JSON, I have only three ... <String, 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 - How can I update JPanel continuously?

I've got a slight problem, I'm writing a gps tracking app to track several objects at once. The data ... help would be 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 - Replace all method throws PatternSyntaxException

look at the following code: String comment = "1)FCR pick up in Hong Kong2)Local charges will be paiy in Hong ... string doesn't seem to appear. See Question&Answers more detail:os...

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

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