36,051 Topics
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| | I am confused about composition in java. I am able to write code using inheritance...but have no idea how to turn it into composition...from what my textbook said the two are quite similar has a is a relationship and all. I ultimately would like to write the cylinder code using … |
| | Hello people, I created an innter class like this [CODE] public class OuterClass{ int attribute=0; class InnerClass { public void method1(){ attribute++; } public void method2(){ System.out.println(attribute); } }[/CODE] My problem is when I call method2() in a correct way, it displays 0 and not 1 as I wanted. Can …  |
| | Hey i was wondering if someone could have a look at this and help me figure out why the output is repeating it's self and how I would fix it. I have spent several hours trying to fix this. Thanks in advance. [CODE]/* Author : * Date :02/10/10 * Title: … |
| | how to .class file from another package????? following is run time error when i execute like this.... [CODE] e:\java2>java employee1 Exception in thread "main" java.lang.NoClassDefFoundError: Employee1 (wrong name : com/project/employee/Employee1) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) at java.lang.ClassLoader.defineClass(ClassLoader.java:616) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14 1) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at …  |
| | i am making a chat server in jsp. i want to insert the message entered by a user in a table but i don't want to use any button to enter the message. can anyone suggest me a method to insert the message in the table when the user writes … |
| | [CODE] private int [] minValues; private int count = 0; String[] tempString ; tempString = line.split("-"); System.out.println(tempString[0]); [/CODE] but when i try to add the store into array's code, [CODE] private int [] minValues; String[] tempString ; tempString = line.split("-"); minValues[count] = tempString[0]; <-- it say incompatible types System.out.println(tempString[0]); count++; … |
| | I would like to write a program which asks the user for a number and prints off the tree, For example 7. Program prints something like that then. If user put 3 tree will start from 3. I think you should get the idea. [CODE] "Enter a number: 7" 1 … |
| | I'm working on a project and want to open the window to the position the same as last time the window was closed, and open the window the same size as last time was closed also. The rough script is as below: When user open the window and resize it, …  |
| | Here my code [CODE] public static String modele; public static String supplier; public static int height = 180; public static final String[] COLORS = { "RED", "BLUE", "GOLD", "ORANGE", "PURPLE", "PINK", "NONE" }; public static String description; public static boolean withSnow = false; public static boolean sale = false; public … |
| | I want to fill a Drop-downlist with a list look heres my list code [CODE] public List ListaEmpresas(){ SessionFactory factory = HibernateUtil.getSessionFactory(); Session session = factory.openSession(); Transaction transaction = null; transaction = session.beginTransaction(); Criteria crit = session.createCriteria(Empresas.class); List empresas = crit.list(); List list = new LinkedList(); // Doubly-linked list list … |
| | Hello everyone in this activity i should use if, else if, Boolean, for loop, do while loop ok here is the OUTPUT i must do: GRADING SYSTEM! 96-100 =1.00 94-95 =1.25 92-93 =1.50 90-91 =1.75 88-89 =2.00 86-87 =2.25 84-85 =2.50 82-83 =2.75 80-81 =3.00 78-79 =3.25 75-77 =3.50 74-below … |
| | Can anybody help mi getting the area so that I display it on a message? Here is the driver: import javax.swing.JOptionPane; public class Driver { public static void main(String[] args) { Rectangle tennisCourt = new Rectangle(); { JOptionPane.showInputDialog(null," Enter Lenght: " + tennisCourt.setLength() ); JOptionPane.showInputDialog(null," Enter Lenght: " + tennisCourt.setWidth() …  |
| | [CODE] public List<SelectItem> getAnalysisList() throws ProjectContentServiceException { selectItems1.clear(); if (getTreeTable() != null && this.rootTreeNode != null) { this.rootTreeNode.accept(new TreeNodeVisitor() { public void visit(TreeTableNode node) { TreeTableUserObject obj = node.getUserObject(); if (obj.isLeaf()) { List<String> aa = new ArrayList<String>(); Map<String, Object> attributes = obj.getAttributes(); if (attributes.containsKey("selected") && ((Boolean)attributes.get("selected")) == Boolean.TRUE) { lis … |
| | hi everyone. i am writing a small caeser cipher program in java for a lab is my cs class. I am sure that most of it is generally okay, but when i run the program it will not return the newly encrypted or decrypted code. Why??? is there something wong … |
| | Google don't crawl my javascript link.. [CODE] <td><span>1</span></td><td><a href="javascript:__doPostBack('grdCompany','Page$2')">2</a> ........ [/CODE] How i crawl these link in Google??  |
| | I would like to build a simple highlighter program. The idea is to set an image to change the cursor so that it will look like a highlighter. And then, when we move the cursor, it will trace a line along with our movement. The requirement here is to be … |
| | I have installed MySql here already, now i need to connec it because I am going to make a project which it needs a Database, but my problem is that I don't know how to set the connector/j/ I don't know how to install it/I don't know how to put … |
| | How do I set a new salary and a new department for the emp1 object class using a setPosition method. Everything works except that for some reason I just can't show the results on Message. Here is the Driver: import javax.swing.JOptionPane; public class Employee { public static void main(String[] args) …  |
 | Hello All, I need to create a java code for auto numbering. A value will be mentioned in a table in database eg 10000. The java file has to retrive the database value and start the auto numbering from that particular number. It should increment by 1 for the next … |
| | I have this try-block [CODE]try { FileReader textFileReader = new FileReader(filename); BufferedReader textReader = new BufferedReader(textFileReader); String post = textReader.readLine(); int weeknumber = Integer.valueOf(post); if (weeknumber != weeknmbr) { System.out.println("Wrong weeknumber."); return false; } post = textReader.readLine(); while (post != null) { insertPost(post); post = textReader.readLine(); } textReader.close(); }[/CODE] but … |
| | I'm working on a simple encryption/ decryption program for class. When I try to compile, I get a number of "expected areas" directed towards the following segment of code: [code] public static char encrypt(char c, String k) { String fullcrypt = (k + "abcdefghijklmnopqrstuvwxyz"); for (int i = 0; i … |
| | [code]import java.util.*; import javax.swing.JOptionPane; import java.text.*; class playGames{ public static void main (String [] args){ Fermi fermi; fermi = new Fermi(); int num1 =fermi.fermi1(); int num2 = fermi.fermi2(); int num3 = fermi.fermi3(); boolean playGame = true; int firstGuess; int secondGuess; int thirdGuess; String inputStr; inputStr = JOptionPane.showInputDialog(null, "Enter the First … |
| | Filename is "htb.java". Here is the code:- import java.io.*; import java.util.*; import java.lang.*; public class htb{ public static void main(String[] args) throws Exception{ File f= new File("dyna.txt"); BufferedReader in = new BufferedReader(new FileReader(f)); String[] line = new String[40000]; line[0] = in.readLine(); int i=0; while(line!=null) line[++i] = in.readLine(); String[] mem_add=new String[100000]; … |
| | Hy , I am using netbeans to create an app. I wanted to eliminate the windows buttons (minimize , maximize , exit) so i could have full control on the exit button , and i used setUndecorated(true) in the PuppetApp.java (main app that netbeans creates). Now i created a exit … |
 | here, there are two functions in branchpredictor class namely predictor and trainer. [B]what i have pointed out is that predictor is working fine but trainer is not updating the variables of the above class. is it that only first function can access the variables. [/B] if not, can any one … |
| | Hi, I m writing code to map single key(Integer) with array of values. But, its not giving the correct output. Here is the code: [CODE]import java.io.*; import java.util.*; class MapDemo{ public static void main(String args[]){ TreeMap<Integer, Object[]> tMap = new TreeMap<Integer, Object[]>(); Object[] vals = {"tree", "map", "sorted"}; tMap.put(1, vals); … |
| | the following code is used to get the contents of an excel document and pint it to console - will eventually filter and write a new excel file, but that will come later. [CODE]/** * */ import java.io.*; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.swing.*; import java.awt.*; import java.awt.event.*; … |
| | hi, im trying to create a program that records the amount of times a number was rolled using input from the user. currently it is only printing 1 number and i need it to print 6. i am only beginning to study java so im lacking knowledge a bit. any …  |
 | hi I came up with this code to help me convert a string into an integer array but i keep getting a null exception when i run it and i am not sure how to fix it. [CODE] import java.io.*; import java.lang.reflect.Array; public class test { static String message; static … |
| | Hi all, I'm new to java programming but finding it rather fun and interesting. Right now I have [CODE]for(String name : chkNms) { JCheckBox checkBox = new JCheckBox(name); checkBox.setMnemonic(KeyEvent.VK_C); checkBox.setSelected(false); // checkBox.setActionCommand(name); add(checkBox); checkBox.addActionListener(this); }[/CODE] to create all the check boxes I need, roughly 30 or so. The last line … |
| | Hello guys, I've been trying to make a program that takes the IDs from a file and make them into a 1D array. The input file looks like this : 201053420 201052456 201488540 201384345 And it should be working even if there's more than 4 IDs. [CODE] import java.util.*; import … |
| | Hi, [CODE] package guiInt; import java.awt.*; import javax.swing.*; import javax.swing.tree.*; public class Init { public Init() { } void buildFrame() { JFrame window = new JFrame(); window.setTitle("Pos Setup Tool 0.1 Alfa"); window.setSize(800, 600); window.setResizable(false); JPanel sidebar = new JPanel(new GridBagLayout()); sidebar.setPreferredSize(new Dimension(250, 600)); sidebar.setBackground(Color.black); JTree tree = buildTree(); JScrollPane sidebar_placement … |
| | This is the instruction: Mrs. Rogers, the owner of "Jus' Right supermarket", has asked your consulting firm to design a program for a simple cash register system which will allow the cashiers at the shop to total the price of the items being bought by a customer, calculate the tax … |
 | So I have this small program that draws circles of different colors depending on "velocity" Below is my code, btw I haven't actually implemented velocity yet. When I run it, I get these"[CODE]Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException at Mouse.paintComponent(Mouse.java:35) at javax.swing.JComponent.paint(Unknown Source) at javax.swing.JComponent.paintChildren(Unknown Source) at javax.swing.JComponent.paint(Unknown Source) at javax.swing.JComponent.paintChildren(Unknown … |
| | hi i'm having some trouble with objectinputstream. i wanted to know if it is possible to validate whether the contents are string or integers then i also wanted to ask how i could convert the contents to int []. For the latter i tried converting it to char [] first … |
| | I have two strings like so: [CODE] String a = "on matt to"; String b = "onomatopoeia"; [/CODE] I've been trying to do... [CODE] if (a.contains(b)) return true; [/CODE] It returns true in this case since the character sequence "mat" matches the "ono[B]mat[/B]opoeia". I want it to return true only …  |
| | Hello programmers, can anyone tell me how to add or set alternative name for certificate to the keystore? I am trying to create web service client using netbeans and when it trying to get wsdl description from site it gives me: java.security.cert.certificateexception no subject alternative names present Site is under … |
| | Hi there, I usually feel really bad posting a whole bunch of code, but might any of you have an idea of why I'm getting an output of 105553 for 55555*66666? I'm supposed to use the A La Russe algorithm for multiplication: n*m m if n = 1 (n/2)*2m if … |
| | Please can you help me to solve an exercise in Java ? Here is the exercise : Create e program in Java that shows an image in a panel. The program let the user to make 2 clicks repeated ( make first click and immediately make the second click. ) …  |
| | i actually learned java only a day ago and we have to submit assignment after two days. i wanted to figure out what i did here with class and function definition is correct. if correct can you help me out with the compilation error. in fact all are similar. it … |
| | i dont know whats wrong with this program...the compiler compiles the program but when i run it it shows: j[B]ohnrambo@ubuntu:~/Desktop$ java lora Exception in thread "main" java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:443) at lunda.l2read(lora.java:24) at lora.main(lora.java:124)[/B] [CODE] class lunda{ String[] la=new String[2048]; String[] lb=new String[2048]; int[] lvalid_a=new int[2048]; int[] lvalid_b=new int[2048]; int[] … |
| | can anybody help me what is wrong in syntax of following [CODE]ihex=Integer.parseInt(s5,16); String bin=Integer.toBinaryString(ihex); System.out.println(bin); if(bin.length()-10 > 0) String orgpc=bin.substring(bin.length()-10); else String orgpc=new String(bin);[/CODE] this is what compiler shows [B]nchy@ubuntu:~/Desktop$ javac bpbc.java bpbc.java:61: error: Syntax error on token "orgpc", delete this token String orgpc=bin.substring(bin.length()-10); ^^^^^ bpbc.java:63: error: Syntax error, insert … |
 | [CODE]import java.awt.*; import javax.swing.*; import java.awt.event.*; public class ClientProgram implements ActionListener{ //static FilmCollection collection = new FilmCollection(); static boolean condition = true; static int memberPassword = 123; static JButton button1, button2, button3; public static void main(String[] args){ int mPassword; JFrame myFrame = new JFrame("Member Login"); //window's title myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//perform exit when … |
| | I am writing a Java program, a MP3 Manager, but I have problems to work with buttons, TextFields, and TextArea. Here are the problem descriptions. Create a class MP3 with instance variables for: artist, song, album, track length (in seconds). Provide a constructor, get/set methods, and a toString. method. The … |
| | I have this assignment where I have to make an xml that has movies names and info. Then i have to make a StAX program that locates the xml file and reads it. The program should also be able to count the number of movies in the decade. Thats the … |
| | hello guys im tryingg to write a program which will generate an aeiou grid...if the program finds two consecutive vovels in a sentence then it will thake the first vowel as the row and second one as the column reference ...and do a +1 in that location i seem to … |
| | Hello, I have Googled this for days, but couldn't find a suitable code/tutorial. I need to write a simple java webservice that would return a XML/JSON file as its output. For example say there's a button, and when i click on it, it should run a SQL [CODE]select * from … |
| | Hey all. I am completely stuck here. I want to implement a round robin based service capable of load balancing http requests. ATM I have a thread with an infinite loop which listens for TCP connections. When it finds a connection, it runs another thread which will process the request. … |
| | I know this is an OLD thread, but i"m having the same problem. a Runtime error when trying to "OPEN" a file. [CODE]public void actionPerformed( ActionEvent evt) { //filterMap.put(evt.getActionCommand(), ((JCheckBox)evt.getSource()).isSelected()); if(evt.getActionCommand().equals("export")){ String file2Read; file2Read = fileIN.getText(); //file2Read = "NotConverted2.xls"; new BPSepcExporter().BPSReader(file2Read); } //If to check if Open button was hit … |
| | Hi, Does anyone know a method or some code to find out whether two numbers have at least one common factor? I currently have a gcd method that finds the greatest common divisor between two numbers however an arithmetic exception is thrown if the two numbers have no common divisor. … |
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