36,051 Topics
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| | hi james cherril I am doing a voting system application of which I have to hand up today. I am getting a runtime error when I entered a record and try to save it. as I entered one record and when the save button is pressed it give me a … |
 | So when I run my code I get a bug where it doesn't display the name for the person when displaying the scores:  Here is my code, I have been stumped for several hours: import java.util.Scanner ; public class StudentApp { public static void main(String []args) { …  |
| | So I get an error that says "no suitable constructor found for Student(no arguments constructor)" /** * Write a description of class Student here. * * @author (your name) * @version (a version number or a date) */ public class Student { private String name ; private int test1 ; …  |
| | import java.util.Scanner; public class LuckySevens { private int diceLength; private int rolls; private int sides; private int numRolls = 0; public static void main (String [] args) { Scanner reader = new Scanner(System.in); int diel, die2, dollars, count, maxDollars, countAtMax; System.out.print("How many dollars do you have? "); dollars = reader.nextInt(); …  |
| | I am working creating a fully encapsulated, homogeneous singly linked data structure. The Listing class and SinglyLinkedList class that are part of the whole application compile fine, but the problem that I am having is performing different operations such as insert, fetch, update, and delete inside of a do-while loop … |
 | Good day to everyone. I need help. Have to make more of these and need someone to show me how. My code doesn't work the way it should. It would have to * wait for you to click jbutton and then: - disable jbutton - roll die, then start timer … |
 | import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.util.ArrayList; import java.util.List; public class MatrixPath { static List<String[]> obstacles = new ArrayList<String[]>(); static String[] size = new String[2]; static String[] startingPoint = new String[2]; static String[] endPoint = new String[2]; static int sizeOfRow = 0,sizeOfCol = 0; char one = ' '; … |
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 | the code will show you what im trying to do, I hope you understand im new to programming but know the basics of java and im trying to add Object Oriented Programming to my apps so its not procedural thanks , if you need more info to understand just ask … |
 | Hi everyone, I am having some problems with this problem. I know I am almost there but I think I am not quite getting it. I get this error when I run it. Exception in thread "main" java.lang.NullPointerException at Newspapers.Subscribers.main(Subscribers.java:14) Can you guide me to the right direction. Thank you. …  |
| | Hi, I'm doing a simple study planner in java. Obviously I need to do a timetable generator. The program works like this: 1. The user enters the start time of school and the length of each breaks (Done) 2. The user enters the lessons(Done) 3. When the user presses next …  |
 | Yes i do know this have been posted atleast two times before, but i can hardly get anyhelp out of it. So back to my post, trying to figure out what i am doing wrong, and why my class wont compile. So i am not really sure what to do, … |
| | hi I am trying to build a triangle calculator that can tell you if you can form a valid triangle, I have reach the calculation part as yet just the part of the gui and that is the part with the error. something is wrong and i cant seem to … |
| | Hello, so I have this program which should be creating a file called output and appending some content from another file,data.txt, accordingly. Creating file called output works but then the output file is empty. what am i doing wrong? Oh and Im suppose to use method print() but that gives … |
 | Hi, I have an app that worked very fine before Iam enabling the SSL to my domian name, I used an web url Ex: api.domian.com for getting detils to the app like login, result etc. some days before I have added an SSL (lets encrypt) the subdomian name suddenly the … |
| | public class StudentListings{ private String name; // key field private int ID; private double GPA; private int next; private int size; private StudentListing[] data; public StudentListings(){ this.name= name; this.id= ID; this.gpa=GPA; } public StudentListings(){ next=0; data= new StudentListings[Size]; size= Size; } // end of constructor public boolean insert(StudentListings newStudentListing) { if(next>=size) // the structure is full return false; // store a deep copy of the client's node data[next]= new StudentListing.deepCopy(); if(data[next]== null) return false; next= next + 1; // prepare for the next insert return true; } // end of insert method public StudentListings fetch(String targetKey){ StudentListings studentListings; StudentListings temp; … |
 | How to make a program that input 5 names and each names consists of 3 quizzes using array.  |
| | hi james Been a while since I have been here. am trying to do this program for the longest while. I have tried read and writing to a text file in java and i am getting a runtime error. can someone tell me where and why I am getting the … |
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 | I'm using JavaFX 8. Right now I keep getting a NullPointerException for my tables. I have initalized the data and it appears when I click on the button to bring it up. However, when I try to search or delete something from the table it keeps giving me the exception. … |
| | Is this book, <JAVA in a netshell> 4th ed, a good book? [url]http://www.amazon.com/Java-Nutshell-Fourth-David-Flanagan/dp/0596002831/[/url] Has anybody read it? I am a C++ programmer and just want to quickly get started with java for simple JAVA programming. Because I don't have time to read <Thinking in JAVA> at this moment, I just …  |
 | class space { public static void main(String args[]) { int i; for(i=0;i<5;i++) { System.out.print("*"); System.out.print("_"); } } for(i=0;i<5;i++) { System.out.println("*"); } } |
 | I'm a master's student preparing for my master thesis I'm interrsting to be software engineer I need help for topics that will reflect my dream goal as software engineer although my supervisor gave my task to write proposal in natural language processing I dont know if is a good area …  |
 | Help- super stumped on my loop... I need to create a loop so the amount that you input for example 5 students inputted, will corrospond to a grade. I have done the code, I just don't understand how I can get the input to corrospond to the grades. Here is … |
 | So I have the following code contained within a class labeled book. public void setPublication(int bookVersion, String bookISBN, double bookPrice) { bookVersion = pub.setVersion(bookVersion); bookISBN = pub.setISBN(bookISBN); bookPrice = pub.setPrice(bookPrice); It refers to the following class, called publication. //Getter method to get the book ISBN public String getISBN(String bookISBN){ return … |
 | Hey so I am trying to finish up a lab that I did not finish during a class this summer. The goal is to have the computer navigate an ASCII maze on its own. We use left/right hand rule to find our way through the maze. IE. you have your … |
 | I have multiple JSpinner which have items 1-10 , and one JTable. When the JSpinner is clicked, the value will be added to JTable. I want to get the row number so I can use it at setValueAt. But I get error when the JSpinner clicked more than once times. … |
 | Hey everyone, I got bored one day and created this little jem. There are no issues with it, but it may help somone out later on down the road if they have a simple project that needs to be completed. Everything is on one pages and includes elements … |
 | Hi everyone, How to select already drawn **single or multiple shapes** . I want to select shapes when i draw rectangle around it and when i click on blank area it deletects it. I need selection for copy, pase, move and delete operation. I don't know where to start to … |
 | Hi I'm trying to make a website. But I need to make a syntax highlighting program that Categorize commands based on what they do. For example, when i type a code in C/C++ or Java on my site, the colors will become highlighted instantly. One group would be I/O, another …  |
| | hello friends i have a problem with javafx AnchorPane. I have an anchorpane that contains a button i want to set the height and width of anchorpane to zero but it no apply. how to do this .... actually i am working on a sliding panel |
| | /** * Help me to solve this one * * The input for input dialog should appear at right textfield * * ex. your firstname? >>> john * john should appear at the textfield label firstname */ import java.applet.*; import java.awt.*; import java.awt.event.*; import javax.swing.JOptionPane; public class Info extends Applet … |
| | Hi there, I want to implement undo logic which deletes the last drawn shape. To test this logic i had cleared shapes list and redrawn all shapes but still **last** shape does not delete. public void drawAllShapes(Graphics2D g) { //draw all triangles for (DrawTriangle t : newTriangles) { t.drawTriangle(g); } … |
| | Hello eveyone, Please tell me why triangle shape is redrawing on mouse move. It want triangle shape draw only once until mouse release. Here is my code below. Thank you ! public class Triangle extends JFrame { Point startDrag, endDrag, midPoint; private java.util.List<Polygon> triangles = new LinkedList<Polygon>(); Polygon triangle; public … |
| | Hi there, I want to draw a triangle using mouse events like mousePressed(), mouseReleased() and mouseDragged(). But triangle did not show until mouse release. Please tell me what i am doing wrong that triangle is not showing in mouseDrag event. And one thing more, triangle is drawing upside down. Please … |
 | import java.util.*; public class MainClass { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Products p1 = new Products(100,"Genius Keyboard",450.50,10); Products p2 = new Products(200,"Genius Mouse",480.00,10); Products p3 = new Products(300,"Monitor",5000.00,50); ArrayList<Products> list = new ArrayList<Products>(); list.add(p1); … |
 | I am trying to create an HTML form which displays text from a text file, using a Java Servlet. I keep getting the following error: Error instantiating servlet class servlets.ReportServlet. Here is the HTML page: <html> <head> <title>TODO supply a title</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body> <form …  |
| | I am trying to create an HTML form which displays text from a text file, using a Java Servlet. I keep getting the following error: Error instantiating servlet class servlets.ReportServlet. Here is the HTML page: <html> <head> <title>TODO supply a title</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body> <form … |
 | Hey guys, I am having trouble with keypress event for a button that I have. This button is programmed to do logoff operation. Now what i want is the solution or sample program in which if user is scanning the barcode of logoff then logoff event should occur.Please suggest solution … |
 | How to Send Email automatically without opening gmail compose box using Javascript |
| | hi So i made a simple game app, and am implementing music now i have easy and hard mode, and game over, as well as home screen homesecreen now plays music1, loops fine and all...then once player selects to play i want to stop the current music1, and start music … |
 | Hello! I am developing a POS System. I have need to print Sales receipt. I have no physical printer to test my printing but i have print on xps document. I am facing a problem with indentation of my data on Sales receipt. Following is the code which i wrote … |
| | In my Food Tab, I wanted to achieve this [Click Here](https://sfault-image.b0.upaiyun.com/358/064/3580648794-597611aa1f701) But I only able to get this [Click Here](https://sfault-image.b0.upaiyun.com/779/111/779111227-5976120f6955a) How can I increase the width of the JTextField which are in Food Tab ? Below is my code public class FoodOrdering { static private JFrame frame; static private JTextField … |
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| | I want to crop an image manually using the mouse. Suppose the image has some text, and I want to select some text from an image, then for that purpose I want to crop that area by using the mouse.  |
| | Hi all few free tutorial sites for beginners are given below. C PROGRAMMING http://learnermode.com/c-tutorial/ C++ pROGRAMMING http://cplusplus.com Java https://docs.oracle.com/javase/tutorial/ C# https://msdn.microsoft.com/en-us/library/aa288436(v=vs.71).aspx Python https://www.tutorialspoint.com/python/ Java Applets http://learnermode.com/java-tutorial/applets/  |
 | If a table contains field's like name,age tuition fee,bus fee,year, 1,2 When I tried to update 1 year details it is updating but when I try to update the entire fields it's not updating in form of jsp page |
| | Can anyone help me out to create multiple check boxes for attendance purpose |
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| | Can anyone guide me to find a way to convert swing application to Android app. If we just create the gui using xml is it enough to take the working code from the previous swing application to run on Android |
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