32,204 Topics
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| | I'm in the process of writing a 2D physics engine in Java, and am trying to figure out the algorithm for the most basic of all physics tasks: Object collision. Detecting collision between two circles is easy: check if the distance between their centers is less than or equal to … |
| | I tried searching and couldn't find anything, so I'm sorry if this has been posted before. I need help aligning output at the command line. I want to make even columns, but can't figure out how to do it. Attached is a screenshot of my current output. I want the … |
| | Write a program HollePrinter that switches the letters "e" and "o" in a string. Use the replace method repeatedly. Demonstrate that the string "Hello, World!" turns into "Holle, Werld!". |
| | In the following method: [CODE] public boolean isMemberAlive(String userSsn) throws SQLException { boolean isMemberAlive = false; Connection c = null; Statement s = null; ResultSet rs = null; String strSQL = "SELECT Count(*) AS RecordCount " + "FROM crs.memmst " + "WHERE memmst_ssn = '" + userSsn + "' AND …  |
| | hi, so im new to java, fresh off the c++ shores (what a nightmare programing is :p) and i have what should be a really simple assignment 1. The electicity accounts of residents in a very small town are calculated as follows: * If 500 units or less are used …  |
| | hi I need somebody to tell me how I can package my java code for distribution and installation |
| | The following program works well.But it cant identify any null values present in the csv file. For Example if csv file contains "Suren,Java,Dojo,Hibernate,,Spring,SOA" .I reads first four strings properly but for fifth string instead of reading the null value it reads the sixth string. Pl. help. import java.io.DataInputStream; import java.io.FileInputStream; … |
| | Hi all, I need to subtotal the amount for all employees using extended data table...If there is any possibilities,.,. |
| | I'm having some trouble getting the times to show up correctly. inputTime is running fine, but neither displayStandardTime nore displayMilitaryTime is displaying. I've been playing with this for a couple of hours and can't figure it out. I'm probably missing something small, but it's driving me nuts in a big … |
| | I'm toying around with Java trying to familiarize myself with the basic GUI stuff. I can't get my program or my text field inside of it to center on the screen. For the Simple... file, I've tried using the [code]theTextArea.setLocation(15, 30);[/code] and [code]//theTextArea.setAlignmentX(CENTER_ALIGNMENT); //theTextArea.setAlignmentY(CENTER_ALIGNMENT);[/code] seperately. When I have either of … |
| | What is the best approach of writing java code in following 2...... ? What happens at jvm level in each case ? 1. [ICODE] for(int i=0;i<10;i++) { MyClass m = new MyClass(); m.doSomething(); } [/ICODE] 2. [ICODE] MyClass m; for(int i=0;i<10;i++) { m = new MyClass(); m.doSomething(); } [/ICODE] |
 | Hello guys. After some time searching around the forums for a thread about an e-book for crash course from C++ to Java and no luck I decided to post a thread about it. So my question is,does anyone has or knows such book? Thanks in advance.  |
| | Hello :) I've been trying to compare to array lists with the following code: [CODE] final VideoObj v1 = new VideoObj( "A", 2000, "B" ); final VideoObj v2 = new VideoObj( "B", 2000, "B" ); ArrayList<Record> list = new ArrayList<Record>(); list.add(new Record(v1,1,0,0)); list.add(new Record(v2,3,0,0)); ArrayList<Record> list3 = new ArrayList<Record>(); list3.add(new … |
| | I wrote this small program for a class im taking, and its supposed to take an int n and a radix (int between 2 and 16) r and give me the number converted to the new base. It only has to go from decimal to other radix's. I run my … |
| | Hello, I don't even if memlocs/offsets are the correct terms for such thing. but I'll try to explain as much as I can. What am trying to figure is; is there a possible way that I could read information off other applications running? For example, I want to make a … |
| | i created a table with a files with auto number in mysql. i added 15 raws of data i deleted some added data (say 6-15) when i add data again, auto number starts with 16. how can i make it 6? (i hope u get the point) |
 | this is a while loop structure.... the output is this .....* ....*** ...***** ..******* .********* *********** supposed to be... this must be a perfect triangle... the dots represents blank spaces my code was this [ICODE=JAVA] public class stars{ public static void main(String args[]){ int stars=5, space=5; while(int i=1; i<=stars; i+2){ … |
| | Hi, The following code works well but the problem is it does noy reads the null values.For Example if csv file contains" Surendar,Java,maths,science,,history,english " Here the program reads the first four strings properly and for fifth string instead of reading null value it reads the next string. Please Correct the … |
| | hello, I'm a beginner and I'm trying to create a mortgage GUI and I'm having some trouble trying to figure out why the variables in my ActionListener are not read. can someone assist? here is my code: import java.awt.Container; import java.awt.Font; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import … |
| | I am working on a coilgun, for a more in depth explanation of how it works PM me ;). Basically it uses electricity to launch a projectile I need to output pulses of varying lengths to precisely regulate the on and off times of some circuits. So basically I need … |
| | Here's my program: import java.awt.Rectangle; public class RectangleTester { public static void main(String[] args) { Rectangle r1 = new Rectangle(0, 0, 100, 50); Rectangle r2 = new Rectangle(0, 0, 100, 50); r2.grow(10,20); System.out.println(r1); System.out.println(r2); } } No error compiling but when I run this is the output 2009-09-14 16:00:29.174 java[414] … |
| | I have question on how to detect an action invoked by a component in some class by the other class. Say: [CODE] public class C1 extends JPanel { JButton button; C1() { button = new JButton(); add(button); C1Action h = new C1Action() button.addActionHandler(h); } public void doSomething() { // code … |
| | This gives a compilation error " missing return statement".. there is no sql error or such...where to put the return.??? private boolean checkpword(){ pasWd = pword.getText() ; try{ /*this works ok...>>>*/ResultSet pwrd = c.getData("Select Pword from users where userNm = '"+uname.getText()+"' "); while(pwrd.next()){ if(pasWd.equals(pwrd.getString("Pword"))){ return true; } else{ return false; … |
| | please can anyone help me doing this example. Add to the text editor's GUI a menu that lists these font sizes: 12, 14, and 16. When the user selects one of the sizes from the menu, the text displayed in the text area changes to the selected size. SNIP  |
| | hii frndz...i want to make a all in one key generator wid d help of java....plz help....... |
| | I have the log file blackjacksample.txt $10000 3 [2H, 4C, KC, 5D] $10 [QS, QD] $5 [AC, 3C, 4D] $25 [10H, 5C, 7H] [7C, 5C, 10H] $20 [JH, 3C, 8H] $15 [3H, 6D, JC] $5 [AH, KH] [9C, JS] $40 [5C, 7H, 3D, KS] $30 [9C, 10D] $50 [AD, 10C] … |
 | Hey all I have an assignment for university where we have to write a program to simulate an IDS. Basically how it works is the user enters a code and the program displays a relevant message. If a specific code is entered, an e-mail must be sent to the adminsitrator … |
| | hi all ! Long time no see :-) I have a small question regarding communication between applications. I have a project where I have to let 2 java applications communicate between eachother. These 2 java applications reside in one vm. Right now, because of the deadline, I use textfiles, al … |
 | Hi everyone am new to java-ing i cant seem to create a class for my first application my "Hello World" when i type javac helloworld it returns that javac is not a in the path and i have created a path for java. Please help me. |
| | I created a table in mysql db. it has a column with auto increment value. i checked inserting data through mysql console putting jst ' ' to the place of the auto increment value in the query. it worked ok. but when i do it through my java application (using … |
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