35,618 Topics
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| | hi i have a method which display a list of customer id's. the method is customerService.getAllCustomersID() how do i check whether this method returns a null list or list or customer id's appreciate a reply thanks |
| | I tried to understand for loops but still not getting it....? please help me with its dry run i know its syntax etc but still not getting it i know it is used for multiple execution...until condition is satisfied please help me understanding in making patterns |
| | Hi! Lets say i have this expression I10I20I-3++ which should give me 27. I just cant seem to find a way of removing those I's or if it is any other letter from the string. Not forgetting i have to then evaluate the expression. I tried using regex but no … |
| | **My assignment:** Write a program that extends the example that we have done in class. Create a class called Trapezium, which is determined by two parallel sides “a” and “b” and the height “h” between them.The area of the trapezium can be calculated as Area = (a+b)h/2 The perimeter = …  |
| | I'm sure everyone has seen this at one time or another. I'm having trouble with the selection sort class. It should take this input: apple Apple Zone apple And return it as: 1:a:Apple 0:a:apple 3:a:apple 2:z:Zone I'm getting it as #0,1,3,2. here is the snippet I'm working with. Thanks for … |
| | HI i have a entity class vehicle and a entity class Customer. A customer has many vehicles, so in the vehicle entity class is as below @Entity @Table(name = "VEHICLE") @XmlRootElement @NamedQueries({ @NamedQuery(name = "Vehicle.findAll", query = "SELECT v FROM Vehicle v"), @NamedQuery(name = "Vehicle.findByMiles", query = "SELECT v FROM … |
| | Hi, i wanted to install maven in my windows 7 laptop.so i downloaded maven bin.zip file from maven website.then i extracted it to the program files as they have said.then i gave the relevant environment variables.but when i'm trying to check that the maven has successfully installed by running the …  |
 | whenever i try to install plugin in eclipse ... from help->install new software... when i give the download link in the workspace it gives the error of multiple problem and says "unable to read repository" .. what that mean ? any solution ? |
| | I need idea for some basic java program based on some real life examole using encapsulation,inheritance and polymorphism. Can you just give me outline and I will code the problem statement..? |
 | According to new research from Kaspersky Lab, in the form of a report called [Evaluating the threat level of software vulnerabilities](http://media.kaspersky.com/documents/business/misc/Kaspersky_Lab_Report_Software_Vulnerabilities_final.pdf), 72% of Java users haven't switched to the latest, safest, version despite highly publicised vulnerabilities and resulting security exploits.  And it's not just Java, the report also …  |
| | Error I get when compiling using Xlint is: where E is a type-variable E extends Object declared in class JComboBox waring: [unchecked] unchecked call to addItem("blank") as a member of the raw type JComboBox c1.addActionListener ( new ActionListener() { public void actionPerformed(ActionEvent e) { if(c1.isSelected()) { fillSF2MC(); c3.setEnabled(false); playBtn.setEnabled(true); faceCombo.removeItem("Blank"); … |
| | Hi, I am new to php. I have copied one php application from one linux server to other linux server after copy application is working fine but the applet to view image in that application is showing two error messages. error is : java.lang.NullPointerException at com.primeleaf.viewer.manager.DocumentManager.setDocument(DocumentManager.java:123) at com.primeleaf.viewer.manager.CommunicationManager.init(CommunicationManager.java:76) at com.primeleaf.viewer.DocumentViewer.init(DocumentViewer.java:67) …  |
 | I've been working on this project for the past couple of days. I can get the code to run, however, i'm suppose to be able to drop the java if I type -1 into the spot. I don't know how or where to place it. Here is the assignment and … |
| | create a console application that compute the area of triangle, and ask the user if he want to repeat the program. but i haved an 8 error saying cannot find symbol in line 19,23,26,27. import java.util.Scanner; public class Area3 { public static void main(String args[]) { Scanner input = new …  |
| | Hello world ! I have two arrays (max 100 characters) that I want to align, and add an "-" when there is disparity I found the Needleman–Wunsch algorithm, which is based on dynamic programming, and the Smith–Waterman algorithm is a general local alignment method also based on dynamic programming but … |
| | I can't figure out how to make a portion of the text bold in the below line(and others). This text is output into a popup dialog. Prefer the first portion "trimmed/squeezed" to be bold. I even tried inserting html code lol. Tried setBold and everthing else I've found on the …  |
| | Hi I'm working on the implementation of a boolean method to check if an expression has balanced parentheses using recursion. I cant figure out how to check if two elements of a given expression match i.e ( ). I was able to finish it without a problem using stacks, but …  |
| | Hello, I am trying to display text(JLabel) above a 3 x3 tic tac toe grid. The JLabel is not displayed. Only the grid shows up. I would be grateful for any help. Thank you! import java.awt.*; import javax.swing.*; import java.applet.Applet; public class Game extends JApplet { LayoutManager layout; private JPanel … |
 | I have created email account in my website(ex: info@mywebsite.com) to use it for sending clients feedback.please guide me in jsp code to solve problem.. |
 | Hello, I have tried making a merge sort method, but I am getting an `Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1 .` How do I fix this error, I have tried but I can not find the error: public class MergeSort{ public static int[] merge_sort(int[] b){ if(b.length <= 1){ return b; … |
| | I am using GUI in netbeans to create a combo box. I want to import all data of a column from database dynamically not manually to a combo box.  |
| | I'm making a paddle and ball game, a bit like pong but instead of another paddle im using the top of the frame, plan to make it into a football sort of game eventually with a bit of work, I have been able to add the ball to the frame … |
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| | hello everyone I learned jsp and servlet, now i wanted to develop a project which not only i shows as major project in my college but also want to learn real time development. If it possible for you give me an idea/ specification(contains Jsp, Servlet/Spring or more..) then i shall … |
| | I have a jsp page where I have embedded a video.Now I want a link to appear ,(after the video is played at least once) for the user to navigate to another jsp page. How will I do it? I have used <EMBED> tag to add the video to the … |
| | Going back to the grocery line queue. At the end of the program, it will output how many total customers I serviced, and it is supposed to output my maximum line length during the simulation. I think its obvious that I will use an "if" statement, but how do you … |
 | Hello everyone, I am working on a program that takes an input from a user and then tests whether it is a binary number or not. If it does not contain only 0's and 1's it prints out not a valid binary number. The part I am confused about is … |
| | Hello, I want to convert a plain text string to binary data so that the readable text is no longer visible, however certain programs can interpret the binary data properly. Something like when we compile a program into a class, the code is no longer readable, but JVM can still … |
 | Hello everyone! I'm currently having a problem with my program it doesn't loop properly please help me with it. The code is below. Thanks in advance! import java.util.Scanner; import javax.swing.JOptionPane; import javax.swing.*; public class Wewe{ public static void main(String[]args){ Scanner inp = new Scanner(System.in); boolean tryAgain; do{ System.out.print("\nInput username: "); … |
| | I want to count the number of times the button is clicked using GUI. I did this code: private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { int clicked = 0; clicked++; System.out.println(clicked); } But it showing the output "1", each time I click the button. I want every time I click the button … |
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