[java] Forum Topics

a ball have radius 20 when i press a button once the radius increase by 5 subsequent clicks have the same effect until a max radius of 30 is reached after this the effect of click is to reduce the radius by 5 until it reach 10. after this a …

I have just started using netbeans4.0, and there is no option to mount filesystem, so how can i import and use the elements package?

A method i have to write finds and prints "magic squares" which are numbers that are perfect squares and a sum of consecutive numbers (1+2+3,etc.) Ex. the first 2 magic squares are 1 and 1225 it seems simple, but what i have doesn't work and i don't know y or …

I keep getting a null pointer exception with this code: It's suppose to load a text file into a textArea. [Code] JFileChooser chooser = new JFileChooser(); int returnVal = chooser.showOpenDialog(this); String getFile = chooser.getName(); if(returnVal == JFileChooser.APPROVE_OPTION) { try { FileReader filegetter = new FileReader(getFile); BufferedReader br = new BufferedReader(filegetter); …

WHAT IS WRONG HERE?WHY WON'T THIS SORT? public class bubble { public static void main (String[] args) { boolean Finished; int[] intRand = new int[11]; int[] unSorted = new int[11]; int intStore; int i; Finished = false; i = 1; while (i < 11) { intRand[i] = (int)(java.lang.Math.random() * 100); …

I'm having a bit of trouble working out what sort of loop to use in a program I'm writing. Basically, I have a file with 2 lists of numbers separated by ";" e.g. Name ;Magnitude 2713.0;21.546 2713.0;19.564 2713.0;20.102 2713.0;20.959 2714.0;22.031 2714.0;18.46825 2714.0;15.323 2715.0;22.808 2715.0;19.345 2715.0;21.357 2716.0;21.473 on so on up …

I found a cool site to do a few programming assignments for me. My teacher is probably the worse programming teacher on the planet. It's cool because they help teach you in the code they write. I didn't feel like they were just "doing my homework". [url]www.imalamecheaterd00d.com[/url]. Check it out. …

can anyone help with this i have to do a project and im running into alot of problems i have to write a discrete simulation to experiment with the performance of this strategy under different timeslice lengths and different dispatcher overhead times [dispatch latencies]. Do this by writing a simulation …

I am having trouble compiling the following piece of code, it keeps giving me an error talking about an possible loss of precision. I know i could replace the one line to: private float someNum = 0; but i don't like that becuase it is assigning an int to a …

I'm programming a GUI and some frames require images to be displayed on them. How do I go about importing a simple jpeg onto a Jpanel within the GUI frame?

the code that is attached it what i have done so far but dont seem to be able to get the test file to get it to display the informationthe code i have is shown below import java.io.*; import java.util.*; public class league{ private static final int MAX_TEAMS = 50; …

:!: Please look at all my message it is not long as it seems. My question is at the end and thank you in advance. Here is a small class called Record that is a utility class for the InventorySet class. final class Record implements Comparable { /** * The …

I guys and girls - im a MrScruff and found your forums when searching for some java problems. It looked like a nice place so i decided to join up! Heres my first java question which has had me perplexed for 2 days considering im sure it should be simple. …

[QUOTE]P = R*P*(1-P) Input: R (growth rate parameter) Double values between 0 and 10. Input: P (population) Double values between 0 and 1. Output: P (New population) on the console in rows of five numbers the exit conditions are the population becomes extinct or stable. Extinction occurs when the new …

Hello everyone, I am wondering what is the most effective approach of retrieving key by value in a Java build-in Hashtable. Can anyone provide sample source codes? Thanks in advance, George

Hello everyone, Using join can control how much time will we wait for a specific thread to accomplish its execution. I am meeting with a new scenario, which is a little different. My requirement is that I want my main thread starts several threads at the same time, which will …

[COLOR=Navy]hello everybody i developed a player using JMF in java. it is unable to play MPEG4 format. any one help me how to make my player to play MPEG4 format files[/COLOR]

Hi I have this html page in the same directory as the ilookpano.zip file as well as the int.caddy.jpg, why is it not working? I would be most gratefull if some one can help. I found this applet on someone else's site and just downloaded the .zip file which has …

Hello EveryBody, I ve Created a JMF supported Audio/Video Player, now i want to set presets like Rock,Jazz,etc. for my player using JMF API. Can anyone help me out in this regard.

I'm having a problem with a GUI i'm building. I have a separate class called Calculations.class which does nothing except hold certain variables and do calculations with them. One of my classes requires a user to enter numerical data, and when a button is pressed, these variables are set in …

I have to add to an exisitng Java program the code for the DSW algorithm to balance a binary tree. I am relatively new to programming so I dont know where to start. Does anyone know where I can find an example of the code? Thanks Joey :-|

Hi i have written a program to identify all the vowels in a sentance and need to output the number as Stars. at the moment it is outputting the number how would i tell the program to output 5 stars instead of the number 5 this is what i have …

i have a public class named as clsbanking using JFrame, and then this frame has a menubar, that has FILE menuitem in it. the FILE menu has an Exit option which will actually close the whole frame for termination, unfortunately my codes doesnt work, what should be my code then. …

OK here is the deal...ive looked and looked at my java book...i am in oracle 2 this year this will be my 1st year...i am doing allright in it...as long as the book can help me...but see i cant find these answers...i have found 1, 2, 3 but not the …

i have been asked to write a program to detect 3 classes of virus worm etc.. and remove them in any language of my choice but i do not have an idea how to do this and would much appreciate if some one please advise me!!!!

Hello. I have made a program that rolls a pair of dice and then calculates the percentage of time a number has come up (see output on image). I am having a problem getting the percentages right...mostly because I calculate the average...how would I get the percent??? However, the main …

Need help with making this work. I can't get the System.format (prepayment) to work. class Mortgage { static NumberFormat fmat = NumberFormat.getCurrencyInstance(); public static void main(String args[]) { String input_amt = JOptionPane.showInputDialog("Enter loan amount: "); double loanAmount = Double.valueOf(input_amt).doubleValue(); String input_rate = JOptionPane.showInputDialog("Enter rate: "); double interestRate = Double.valueOf(input_rate).doubleValue(); String …

:confused: Hi, I have this homework to do and I have to solve a method called: public Collection toCollection(). Here is what i solved so far: final class InventorySet { private Map _data; int thesize; InventorySet() { // TODO _data = new HashMap(); } /** * Return the number of …

i need to a sub class for the boat rental but i am not sure how to do it i will give the code and it needs to inherit to the parent class can somw help out

hia, the below program is a Simulation of Producer-Consumer Problem using Race Condition.Please can anyone help me to finish this program in java language.Thanks a lot lux melxxx Producer/Consumer code int BUFFER_SIZE = 100; int count = 0;   void producer(void) { int item; while(TRUE) { produce_item(&item); if(count == BUFFER_SIZE) …