Recent questions tagged java

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java - Detect Socket is closed after remote application is closed forcibly

I'm having some trouble with Java Sockets. I have a pair of applications that establish a connection between ... other side is forcibly ended? 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 Excel and get the row number and file extension for embedded objects

I am using Apache POI with Java 1.8 in my application. In my application, I try to read Excel and get the ... resolve this will be very useful. 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 - Nosql model structure

How would you structure your Cloud Firestore db. I have collections of Teams, Arenas and Games: public class Team { ... ? (or any nosql db) 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 - NullPointerException in JPA

I am creating a Java EE application using jpa. I am getting the following error when the code is run on ... reason for this error could be. 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 - First unique character in a string using LinkedHashMap

Given a string, find the first non-repeating character in it and return its index. If it doesn't exist, return -1. ... , but I want to print 3. 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 - RMI lookup works but method invocation not

UPDATE: The problem is, that i'm using a kind of 2-way connection. On client side, this works: String a ... what could be the problem? regards 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 - Gnuplot and Sierpinksi Triangle

Question: I have a code, which hopefully makes a Sierpinski triangle, and I am wondering how can I output a data file that ... + y) / 2; } } } 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 - Gui blocked when starting Thread from button clicked event

This may be a basic question but one that I am stuck on. I would like some more understanding on ... becoming unresponsive when running threads? 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 - Passing reference to javafx.application.Application

Consider a non-fx existing application, let's call it Business. Business exposes a Model object, which in turn ... approaches ? Best practice ? 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 do I apply a color to a single bar of my single series graph?

I am new to JFreeChart and I am trying to see what action do what. In my chart I only have one series, and I ... do I apply that to my chart ? See Question&Answers more detail:os...

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

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789 views

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java - How to get ordinal Weekdays in a Month

hi i want to make a program in java where days,weekNo is parameter ..Like First Friday of the month or second ... ..and it returns the 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 - Use Enter Key Act Like Tab Key on jTable

I'm stuck from 2 days in my project i cant implement how to make the ENTER KEY act like TAB KEY i tried ... need you help. 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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java - The point of origin in my GUI is off by about 25/26 pixels

My point of origin (0,0) on my GUI is moved up by about 25/26 pixels. So the very top-left corner of my GUI ... (Graphics g) { paint(g); } } 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 - Non repeating random number array

I need to make a typical integer filled array with 10 random non repeating numbers from 0 to 20. Also, I need to be ... 20. How can I do 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 - How to Parse the JSON String Android

I'm trying to Parse the below JSONString [[{"0":" ","title":" Technical Support Analyst in Noida"," ... Parse title,CompanyName,Category Etc... 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 - Cygwin "git clone" gives "remote end hung up unexpectedly" against Ubuntu 10.04.1

I am in the process of figuring out how to get Eclipse (Windows 7) working against our freshly git-migrated CVS ... to know to make this work? 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 - for loop gets error "illegal start of type"

so im trying to create a program in java which will create a 10 by 10 matrix, with each element displaying ... an error quite like this one. 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 - "Integer too large" for a small compile time constant

I have this: switch (account){ case 08120: // Savings deposit interest rate return null; case 13100: // ... What on earth is going on? See Question&Answers more detail:os...

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

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874 views

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java - Prevent file channel from closing after reading xml file

For more detailed information regarding the motivation behind this goal (and my efforts to solve it) view my ... would be great! 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 - hibernate multiple schema mapping

I have a Hibernate project, and multiple entities. Each entity needs to connect to several database. (table1, ... age; //getters setters } 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 program locks/freezes whilst running

I'm trying to create a JavaFX program, which is working - but I am trying to get a progress bar to ... to update whilst it processes? 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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890 views

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java - Use of SwingWorker to do complex tasks in background

I am having a GUI of login screen. Whenever i press the login button the user name and password is checked ... use SwingWorker for my purpose. See Question&Answers more detail:os...

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

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810 views

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java - Want to open a eclipse xml file in code and navigate to a specific line number with reference to its IFile

I have a reference to an xml file in eclipse IDE through its IFile instance. I know want to add an action on ... ideas on how to go about 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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727 views

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java - How to remove the Border of jSlider

I`ve customized an jSlider facing a little problem- After changing values, on my custom jSlider is a border shown. ... Color(255,255,255); } See Question&Answers more detail:os...

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

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924 views

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java - How to get Spinner Selected Item in Android

I am making a currency converter with two spinners. I want to make an "if" function using the values of the ... appreciated. Here is my LogCat: See Question&Answers more detail:os...

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

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1.2k views

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java - Vaadin 8.5.1- Refresh grid after row update

I am using Vaadin 8.5.1 Grid to display 1000's of rows. Once a row is updated with change in it property, ... on how to solve this problem TIA See Question&Answers more detail:os...

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

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840 views

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java - Android: Parsing JSON string inside of double quotes

I am normally using the following code to parse JSON strings: JSONObject jobj = new JSONObject(message); strmsg = ... way to deal with 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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956 views

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java - Regular Expression check length

I have been trying to make a regular expression for my mobile phones but I can't seem to get it to ... mobile number 0991234567 || 09912345 See Question&Answers more detail:os...

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

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