36,051 Topics
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| | Hi, I have to read and store 70 millions of Double objects in a Vector. The problem is that it seems that Java will allocate 40 bytes of memory for each Double object and the memory amount we need to store such number of Doubles object is approximately 2.8 GB. … |
| | Hi I'm making the mastermind game but using numbers instead of colours. The one part that I'm stuck on is when the right number is guessed but in the wrong position, it seems to count it too many times. for example; generated number: 4234 guess: 2122 real answer should be …  |
| | Hi everyone! i am trying to find the average from an arraylist conatining database values. My database table have 9 columns and has 168 rows. Now i need to find the average at an interval of 12. My database table has time as 1 column and 8 other columns with … |
 | Hi. i am using java launcher from 1 year. its a freeware. it says that the edition is expired. i tried re-installing it but it says the same how to fix?? |
| | I want a user to enter the query: "select * from books where price > 24.99 and price >= 25.00" for example, but since the statement doesn't need price >= 25.00, I want to rewrite the query to just "select * from books where price > 24.99" and give the … |
| | i was just hoping to get help on an assignment i've been racking my brain over for the last couple of hours. i'm asked to program a database of houses using object oriented programming. i'm suppose to do this by writing a house class, an address class, and a third … |
 | Hey here's my code for functioning like MS Paint. But JLabels are just not visible. Please Help. [CODE] import java.awt.event.*; import javax.swing.*; import java.awt.*; import java.awt.image.*; public class MSPaint { JFrame frame; JPanel panel; Painting paint = new Painting(); public MSPaint() { frame = new JFrame("MS Paint"); frame.setSize(1024,768); panel = … |
| | Hi i'm creating a GUI and i have a couple menu items set up with options within those menus. What I'm looking to do is use those items inside the menus to open up more menus kinda like when you go down to all programs in your start menu and …  |
| | hello i use eclipse when i add action listener for button it marks as redline iam using swing component what is the problem ?what is the actual problem in that |
| | hello I developed a chatting application with GUI. when the TextArea is full and if any new text is added, the JScrollBar will not scroll down automatically. I struggled a lot to make it scroll automaticaly but ended with dashing hopes how to make the JScollBar to scroll down automatically. …  |
| | I am trying to change the background color of the JPanel every 3 seconds (3000 ms) when I click START button till I press STOP button. [CODE] import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.Random; class TimerBackground implements ActionListener { JFrame frame; JPanel panel; JButton btnStart; JButton btnRed; JButton btnGreen; … |
| | I'm need to set up teams based on how many wins the team has inside this text file : [code] UNCC 30 NCSU 28 GT 25 USC 20 GSU 19 UVA 15 UGA 2 UNC 1 [/code] For example the output of the program should be: [code] UNCC VS UNC …  |
| | for (count=1; count<=10; count++) { number1= randomNumber.nextInt(10)+1; number2= randomNumber.nextInt(10)+1; Help correct= new Help(number1, number2); switch(choice) case 2: if (number1 > number2) { System.out.print("What is the answer to this problem? " + number1 + "-" + number2 + ":"); ans= keyboard.nextInt();//stops at 2 problems!!!!!! a= correct.getSub(); if(ans == a) { System.out.println("The … |
| | i am having a problem to write the code for a project that i have i need to get the label to the picture attached to count how many oval and rectangle are in the picture i have the code for the rest i just cant figure how to arrange … |
| | I compiled this program with no error, but when I run it give me some kind of problem where I have: idNumber = inFile.nextInt(); //student ID number. Appreciate any help. Thanks [CODE] /* *Description: Writing own method, Switch Selection Control, String,Accumulating, *Counting method, array base on last reviews from previous … |
| | What are the drawing functions in Java If possible explanation of these functions:icon_rolleyes:  |
| | hello guys am new to jsp and struts i have an issue in jsp struts consider there are two jsps 1 is genmenudetails where it contains the buttons (getdetails,add,delete) 2 is another jsp which consists of genmenudetails jsp initially delete button was not enabled then i went to businessdelegate of … |
| | consider a instance jtextfield t=new jtextfield(); jtextfield t1=new jtextfield(); jtextfield t2=new jtextfield(); i want to get the values of textfield t and t1 and display in t2 like i want to add values of t and t1 and store in t2 |
| | Hi, I have checked examples and tutorials but never seem to get a direct answer to a couple of questions. When using a Gui with a JButton (Netbeans)where does the code for the array go in order to be displayed? Here is the code for the array and I just … |
| | I want to create a file by entering its name at runtime through command line argument..But i am not getting any idea about how to do that?? Please provide some help.. THANKS |
| | I have made two programs in servlet....one for setting attribute and another for getting that attribute.... Here are those programs... /* For Setting Attribute */ [code=Java]import javax.servlet.*; import java.io.*; public class SettingCntx extends GenericServlet { ServletContext ctx; public void init(ServletConfig cfig) { /*Obtain the ServletContext object*/ ctx = cfig.getServletContext(); } … |
| | import java.lang.reflect.*; import java.awt.*; import java.lang.*; class SampleField { public static void getField(Class c) { //Class c= Class.forName(s); Field f[]=c.getFields(); for(int i=0;i<f.length;i++) { System.out.println(" "); Class type=f[i].getType(); System.out.print(type.getName()); System.out.print(""+f[i].getName()); } } public static void main(String... s1) { try{ Class c= Class.forName(s1[0]); getField(c); }catch(Exception e){System.out.println(e);} } } I have written the … |
 | [COLOR="red"]when i tried to register the remote object with rmi registry i got following[/COLOR]: J:\prgs\my>start rmiregistry J:\prgs\my>java -classpath .. my.Register java.rmi.ServerException: RemoteException occurred in server thread; nested exce ption is: java.rmi.UnmarshalException: error unmarshalling arguments; nested excep tion is: java.lang.ClassNotFoundException: my.MyServer_Stub ---------------------------------------------------------------------------------- [COLOR="red"]here is the code of Register.java[/COLOR] [CODE]package my; import … |
| | [CODE]import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public abstract class login extends JFrame implements ActionListener { public static void main(String[] args) { JTextField firstField = new JTextField(10); JPasswordField middleField = new JPasswordField(10); JButton b1=new JButton("ok"); JLabel firstLabel = new JLabel("username", JLabel.RIGHT); firstLabel.setDisplayedMnemonic('F'); firstLabel.setLabelFor(firstField); JLabel middleLabel = new JLabel("password", JLabel.RIGHT); … |
| | hey, i have been working on my final year project, the program is finished and now i have do the testing. i have finished black box testing but i have no clue how to do white box testing. i have looked around the web but there is only definition of … |
| | //servlet [CODE] if(rs.next()) { String s1 = rs.getString("pname"); String s2 = rs.getString("remarks"); String s3= rs.getString("cnt"); String s4 = rs.getString("bsponsor"); String s5 = rs.getString("bprowner"); String s6 = rs.getString("priority"); list.add(s1); list.add(s2); list.add(s3); list.add(s4); list.add(s5); list.add(s6); } session.setAttribute("list",list); RequestDispatcher rd=getServletContext().getRequestDispatcher("/project.jsp"); rd.forward(request,response); [/CODE] //jsp page [CODE] <% ArrayList arr = (ArrayList) session.getAttribute("list"); String myString=""; …  |
| | What is the difference between an abstract class and an interface?give me an example? |
| | Is there a way to create a program to rewrite a query in an optimal form. If so, how? I already connected MYSQL to Java. I just need ideas on how to implement it. Thanks. Rewrite: SELECT EMPOYEE.EMPNO, POSITION FROM EMPLOYEE E, JOBHISTORY J WHERE E.EMPNO = J.EMPNO AND STARTDATE … |
| | I found a link to javadoc for JXSE 2.7 from [url]http://jxse.kenai.com/Tutorials/Tutorials.html[/url] which provides a link to javadoc on kenai.com but either the link is broken or the java doc is moved elsewhere. If anyone know working link to JXSE 2.6 or 2.7 please let me. Thanks |
| | NOTHING HAPPENS AFTER EXECUTING THIS CODE, BUT IT COMPILES AND RUNS SUCCESSFULLY [code]import java.io.IOException; public class Runx { public static void main(String args[]) { try { String x="cmd /c dir"; Process p=Runtime.getRuntime().exec(x); } catch(IOException e) { e.printStackTrace(); } } }[/code] Please help.......................  |
| | Hey; I'm trying to do a hang man game in Java. I newly learned some stuff about programming some GUI using Swing and AWT, but I'm not still clear with it. The problem is that all the drawing is done by a single function paintComponent() from the JPanel that I … |
| | steps 1.I create a java project. 2.in the same java project i ll create a main class(say sample). 3.i ll call a function(say sample_function()) inside main class. question is: where should i implement the function(sample_function()) i.e should i have to create a new class in the same project or i … |
| | Seem tangle myself up with coding here and couldn't solve much of problem after many long try. I need your fresh set of eyes. Below is my errors. Thanx /* *Description: Writing own method, Switch Selection Control, String,Accumulating, *Counting method, array base on last reviews from previous labs. *prepare a … |
| | Hey I have a question about running an application that uses a .jar file. If I have a file outside called Tester.java that uses a jar file, let's call it myJar.jar, and let's say the classes are packaged as myPackage.myClasses. I imported all the classes I needed using [code] import … |
| | After following above program i still have tons of error on my list what step i could have missed... I really need to get it to work before i could start on my project... [url]http://integratingstuff.com/2010/10/18/writing-code-that-captures-videos-on-android/[/url] |
| | Sorry if this is posted in the wrong section. But I came across this question on a test: Which of the following will evaluate to true only if boolean expressions A, B, and C are all false? (a) !A && !(B && !C) (b) !A || !B || !C (c) … |
 | Hi my problem is that i'm making a mobile app and i need to seperate the following string: ChrisHunter21 into: Chris Hunter 21 What is the easiest way to do this in J2ME ? i had a look at the Ostermiller one but didnt understand it. Thanks Chris |
| | I've tried many time to solve this problem...but still not successful, I'm newbie..so anyone of guys can help me check this problem... [LIST] [*]Button "Back" is big as frame [*]Seems no TextField for NoOfTicket [/LIST] [CODE]import javax.swing.*; import java.awt.*; //import java.awt.event.*; public class ticketReservation extends JFrame { private JLabel jlbWelcome, … |
| | Hello, i have a class "Die" and a class "PairOfDice" pair of dice extends die. i need to instance variables of type die in pairofdice constructor... i think. here are constructors for die and pairofdie.. we learned all of this earlier this semester but apparently i didn't learn it well … |
| | Edit: Never mind I figured it out. I used Math.pow(base, exponent) to figure it out I'm creating a calculator and I can figure out how to the power of two doubles. This is what I have: [CODE] public Power(Double base, Double exponent) { result = base ^ exponent; //result is … |
| | I know this is a very common program that has been discussed, and I have searched through all the previous posts about it but still having problems. It's a program for an airline seating reservation. Consists of 12 seats total, 1-4 is First Class, and 5-12 is Economy. I have … |
| | My assignment: develop a limited application to track the statistics of sports players. For each player, track first and last name, points scored, assists made, and penalty rate. Design and implement an object capable of recording this info. Implement this object as Player. Must allow user to enter new player … |
| | i have an error of line 40 illegal start of expression and line 73 class interface,or enum expected. im making a 10 random numbers display them determine the largest and the smallest number of 10 random numbers thanks.. [CODE]import java.util.Random; /** Generate random integers in a certain range. */ public … |
| | I have to create a Pizza GUI that shows pizza size choices and topping choices for pepperoni and mushrooms and then calculate the total. I'm having trouble constructing the GUI. Down in the createCenterPanel method Eclipse is tell me that radioButtonPanel, checkBoxPanel, and pricePanel cannot be resolved to a type. … |
| | [B][COLOR="Red"]final[/COLOR][/B] members are used to specify that it can not be [I]revalued[/I] or [I]overriden[/I]. :icon_lol: [U]Explain [B]logically,[/B] [I]why[/I][/U] a [B][COLOR="Green"]static[/COLOR][/B] method can not [B][I]override[/I][/B] comparing it with an [I]instance method[/I]. May a [B][COLOR="Green"]static[/COLOR][/B] variable be [B][I]revalued[/I][/B]? :icon_exclaim: If, [B][COLOR="Green"]static[/COLOR][/B] also serves the same purpose at this point as [B][COLOR="Red"]final[/COLOR][/B], then … |
| | Hi , I have a problem. I am inserting 5 rows into a table. Before inserting i disabled the auto commit(conn.setAutoCommit(false)). And after i have not at all commited the transaction. And i used rollback for every exception in catch block. But, The transactions are saving up to the exception. … |
 | Hello, I'm currently looking for a book the covers "how to develop a game". I have basic knowledge of Java. I know: arrays,classes,GUI,basic animation with Timer class,basic graphic. I want to move on and start learning threads, collitions, keyboards and mouselistener and all other game related topic... I was wondering … |
| | Hello I have Java application that runs under unix and has console for user imput. I would like to perform something like this - If I enter "edit config" I would like to vi pop up with config file loaded (with java still running in background" and after user is … |
| | code above would print first month correct. but from the second month days or not in order.[code]import java.io.*; public class calendertest { public static void main(String[] args) { int months=12; int days=0; int i=0; for(months=1;months<=12;months++) { System.out.println("----------------------"); if(months%2==1) { for(days=0;days<=31;days++) { if (days%7==1) System.out.println("sunday-"+days); else if(days%7==2) System.out.println("monday-"+days); else if(days%7==3) System.out.println("tuesday-"+days); … |
| | I would like to know how i can replace an outputline with a write to a log file? Ive tried searching but no luck. |
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