3,319 Unanswered Topics
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| | My Java application crashes with a NullPointerException when trying to access an object property. Here's the problematic code: public class Test { public static void main(String[] args) { String text = null; System.out.println(text.length()); // NullPointerException here } } How can I properly handle this scenario? |
| | if i provide you with my project OOP java can you transform him for me to GUI |
 | Describe prototypal inheritance in JavaScript. How does it differ from classical inheritance in other programming languages? |
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| | Hello guys! Sorry newbie here. I get an error in Netbeans while trying to add an Icon to a J label. The error is: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null After importing all of the images I used for my project. I still get … |
| | Jackson does not provide a tool for generating Jackson classes from XSD or JSON, as JAXB does for a specific XSD. The JAXB class generator was used to generate a set of classes for the specified XSD schema. For polymorphic types, for example, JAXB provides the following annotation to identify … |
| | Hello, I am developing android java filemanager app.. I used checkbox to check 1/file.mp4 2/folder(files+sub folders) . How can i add copy paste feature for checked 1, 2 file folder fully at same time ?like -google filemanager app.. Advance Thanks |
| | import net.proteanit.sql.DbUtils; import javax.swing.*; import javax.xml.transform.Result; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.*; public class EmployeeRegistriation { private JPanel Main; private JTextField txtName; private JTextField txtSalary; private JTextField txtMobile; private JButton saveButton; private JTable table1; private JButton updateButton; private JButton deleteButton; private JButton searchButton; private JTextField txtId; private JScrollPane tabla_1; public … |
| | I'm trying to manage Splunk with Chef and ran across a problem when using Chef to programmatically start/stop/restart the Splunkforwarder service: The request did not respond to the start or control request in a timely fashion. - ControlService: The service did not respond to the start or control request in … |
 | Is there a way to print out numbers for pre-order, post-order and in-order traversals of trees using just recursion and a number. The trees are binary and n is the number of nodes from the parent to al children. Can anyone help me write the function to print the numbers … |
| | I have a problem with a DnD program, so when I add 2 or more images and apply a filter to one of the images (using a right click), it only appears on the last image added. I think i have to store the image in an Array while waiting … |
| | Hi All, I have a list of claim ids, and I want to add previous and next button in the jsp . 1. ClaimSerachResults page have the search list of claim ids. (Proposed claim/Generated Claim). After clicking on any claimid it display the full record details. Then user can modify … |
| | How to draw this cat with: Rendering fill Suitable primitives Aligned texture  |
 | Hi Am new at programming . I ask about how I but button that onclick it's guide me to form this form had submitted page I need to make this form when fellup the data that the user it's sind to my java SQL . Can any one help me … |
| | Hi everyone, I need ideas on how to initialize a new program in which a class GeometricSequence will extend Sequence. It has to implement public void generate ( ), which generates the sequence via 𝑎𝑖 = 𝑎0∙generator𝑖 (𝑖 = 0, 1, …, numTerms−1) and puts it into a double []. … |
| | Create a class named SavingsAccount and provide a method called deposit to allow a customer to deposit to his savings account, another method called withdraw to allow a customer to withdraw from his savings account, ensure that the debit amount does not exceed the savings account balance. If it does, … |
| | Hello. Can anyone please answer and explain the question from the image here. Thank you!  |
| | Hi, I am new to this forum and also new to android programming using Android Studio and am stuck on a coding problem so i am not sure this is the right forum but any help is much appreciated: I am trying to get some some code via the processing-core … |
| | I am student of Java and working freelancer for different companies. I am intrested to work with project enviroment. Please support for practical work in developer backend |
| | <LEGEND ><b><%=pagetitl%>:-</b></LEGEND> <div id="container"> <div id="dynamic"> <table cellpadding="0" cellspacing="0" border="1" class="display" id="example" style="width:98%;" > <thead > <tr style="background-color:#E6E6FA;border-color:#a7c9de;"> <th style="border-color:#a7c9de;" >File ID</th> <th style="border-color:#a7c9de;" >Title</th> <th style="border-color:#a7c9de;" >Name</th> <th style="border-color:#a7c9de;" >Last Refresh Date/Time</th> <th style="border-color:#a7c9de;" >Refresh Now</th> </tr> </thead> <tbody> </tbody> </table> |
 | hi there i have an XML file wich contain some music information in a node and i would like to insert more i would like to add more node on demeand when i do i receive this error HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is … |
 | I came across a KMeans implementation in Java. The number of clusters generated by the code is 3. But when I tried to change it to 2, I am getting the error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 Any help is much appreciated. Here is the code: public class KMeans … |
| | import random money = 100 Ask user if they want to play or "QUIT" (.upper()) while game != "QUIT": 2 dice generate random numbers 1-6 on each (generate random numbers inside while loop) Every roll cost $3 Win $5 if total is 7 Win $10 for snake eyes Else display … |
| | I am writing a Mastermind program in Java. So the user has to enter the number of pegs and colors and a code will randomly be generated and the program will do its thing and tell them if they got the code or not. I have a bunch of IF … |
| | Java is necessary in every field. |
| | Hello, I have been using the JDoddle online IDE for Java programming: https://www.jdoodle.com/online-java-compiler/ I am unable to increase the font of the Java output terminal. Can that be done? Thank you |
| | Dear software developers, We are researchers aiming to understand developers' knowledge needs and program comprehension. Our intention is to support practitioners in selecting tools that can facilitate developers' tasks. Moreover, we hope that our research results in the development of new tools that are customized to the actual needs of … |
 | I am taking a class on RN with Kotlin and got stuck on this assignment. When I try to pass an array of integers from JS to Kotlin, I get the error java.lang.RuntimeException: Got unknown argument class: int[]. Calculator.kt @ReactMethod fun getSum(values: IntArray, callback: Callback){ var total = 0; // … |
| | As one of the most powerful tools in Excel, PivotTable has the ability to calculate, summarize, and analyze data, which allows us to see the comparisons and trends of our data more intuitively. In addition, PivotTable also has the ability to sort and filter data, and it can meet our … |
 | I have the following Java code snippet: Map<String, List<String>> phones = new HashMap<>(); phones.put("User1", Arrays.asList("0502324547", "0651634767")); phones.put("User2", Arrays.asList("0977634321", "0697654221")); phones.put("User3", Collections.singletonList("0970011223")); Map<String, String> map = phones .entrySet() .stream() .flatMap(e -> e.getValue().stream().map(v -> new AbstractMap.SimpleEntry<>(v, e.getKey()))) .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); Using it I'm converting Map<String, List <String>> to Map<String, String> and then passing … |
 | Hello, I am working a program that starts at a direction and goes to the destination and reverse. I have reversed the list and used a if statement for the switching the directions from R (Right) and L (Left) but it doesnt want to work properly. My question is how … |
 | Hello , in working on java program And i made 4 classes with main So they want me If the class if ( convener ) they want me to enter the id to dsplay the 1-allocate method 2- drop method 3-print report Dont know how to do it |
| | Hi, Question. How does UserDetailsService catch the username that I have submitted in the custom login page which I have created? TIA :) |
| | Connect your website you must first access HTML content on your website and add the icon. • Copy the pre-authorized icon in HTML content for your website • Then, go to your main page for AdSense to confirm the completion of this step. Copy this icon and paste it << … |
| | import java.awt.Canvas; import java.awt.Color; import java.awt.image.BufferStrategy; import java.awt.Graphics; import java.lang.Runnable; import java.lang.Thread; import javax.swing.JFrame; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.IOException; public class Game extends JFrame implements Runnable{ private Canvas canvas = new Canvas(); private RenderHandler renderer; private BufferedImage testImage; private Rectangle testRectangle = new Rectangle(30, 90, 100, 100); public Game() … |
 | Hi all, I have an application which saves data (books details like book title, author and location) to a mySql db and performs CRUD operations. I thought I'd use hibernate to take care of the ORM side of things and everything was OK when it came to create a record, … |
| | Hi , i have two jsp forms ,one is student1.jsp and student2.jsp in student1.jsp name ,fathername,mothernames are input fields and student2jsp brothername and sistername's are there one database student(name ,fthername,mothernames,brothername ,istername's) what i want is to store two forms data into onedatabase . is it possible?then how?. |
| | The question is compPickInt will now be a 0,1, or 2. Use an ‘if-else if’ structure to convert the numbers to a char variable with the value of R or S or P and Prompt the user to enter R for Rock, S for Scissors or P for Paper. Use … |
| | hai all, i have 2 tables 1)state state contains stateid,statename here stateid is primary key. city contains cityid,cityname,stateid stateid is foreign key. 2)city now state contain 1 ap,2 tamilnadu,3 banglore. city contains chittor 1,madanapalle 1,tirupati 1 katpadi 2 ,kanchi 2 mysore 3 ,chintamani 3 when i select the ap city … |
| | iam using oracle11g and jsp ,i have one task there i want use isActive how to use that. i dont know atlease what is isActive please explain. |
| | hai all , iam using the jsp in that i have small dought , DBtable: id,description,created by ,create time,modified by ,modified time ,isactive Jsp: i want to store that values in databse using the jsp;here id is auto increment,description is user enter ,created by created by ,create time,modified by ,modified … |
 | i've been tried some code : a.html : <div class="content"> <a href="howto_google_maps.asp">Google Maps</a><br> <a href="howto_css_animate_buttons.asp">Animated Buttons</a><br> <a href="howto_css_modals.asp">Modal Boxes</a><br> <a href="howto_js_animate.asp">Animations</a><br> <a href="howto_js_progressbar.asp">Progress Bars</a><br> <a href="howto_css_dropdown.asp">Hover Dropdowns</a><br> <a href="howto_js_dropdown.asp">Click Dropdowns</a><br> <a href="howto_css_table_responsive.asp">Responsive Tables</a><br> </div> b.html (1st trial), i got this from w3schools : <html> <head> <script src="js/jquery-3.3.3.min.js"></script> <script> function includeHTML() … |
 | Hi developers! I have made a POS software. I have added the functionality of "priniting to Thermal printer" and "barcodes". Firstly I added the functionality of Reciept printing which worked perfectly. Then I added the functionality of barcode scanning. As you know barcode reader device automatically scans the barcode and … |
| | Hi developers! I have made a POS software. I have added the functionality of "priniting to Thermal printer" and "barcodes". Firstly I added the functionality of Reciept printing which worked perfectly. Then I added the functionality of barcode scanning. As you know barcode reader device automatically scans the barcode and … |
| | Hi all, How to store data in two different tables when we click the button. Suppose I have a 2 tables named as team1 and team2. In table team1 have 2 fields teamid,teamname In table team2 have 3 fields team2id,team2name,teamid here teamid is foreign key. So when i click on … |
| | Hi all, How to store data in two different tables when we click the button. Suppose I have a 2 tables named as team1 and team2. In table team1 have 2 fields teamid,teamname In table team2 have 3 fields team2id,team2name,teamid here teamid is foreign key. So when i click on … |
| | hello everybody who can help with this task Now I will talk little about monoalpahapit cipher This is cipher is based on substitution the characters with another characters So in the encrypt.java file it counts how many the characters appeared in the cipher text , so in the picture that … |
 | my project is sort score of Student using Linked List and sort algorithm can i coding loop for input from user and save value to node in linked list and export or sort value like this ? Thanks for help or discuss or give any idea (any code is idea … |
 | Hello everyone, I am having trouble in displaying the multiple images on jsp. I am using servlet to pull the image from the database. Following code, will always display single image multiple times on my jsp page. Can anyone please help me in rectifying the error in the code. I … |
 | I want to print the username on jsp page"**success.jsp**" from "**home.jsp**" i have used **hibernate** to save data in table . "home.jsp" <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <center> <h1 ><font … |
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