Java Definition and 572 Threads

Hi. I'm completely new to Java, but I'm taking a course at a local university. I was wondering if someone could help me with this. I need to create a program that counts change (pennies, nickels, dimes, quarters). I've only been taking the class for about a week and am still very...

Can anyone help me with a site where I can learn java programming language? I really need it, I'd be very grateful

I was wondering if I would be able to handle Intro to Java if I go in without any programing experience. I have experience in Calculus up to vector calculus and differential equations, electricity and magnetism physics course, but no programming. You guys think I can handle it?

Hello everyone. I was wondering if anyone has any suggestions. Well I should be graduating this spring if every went to plan. But of course it didn't. I started going to school in 2003 as a Software Engineering major, got hurt took a year off for recovery, went back to school as a computer...

Is there any way to get color from RGB value? for example If I give some random RGB value like r=221 g=255 b=123 then how do I get the color associated this RGB value? Thanks in advance.

Here's what I wrote , but there's no output.. It is suppose to read a line typed from the user and enter whatever the input was with the letter after the ones inputted. please help import java.util.Scanner; class ProblemS2 { static Scanner sc=new Scanner(System.in); public static...

I have a window here and I want it to close the whole program when the user clicks on File>>>Close. I just need to know waht to put inside the method to close the program. I mean, how do you terminate the program in java?

Hey, I'm working on a project with RoboJDE and java and I have a few quick questions. What I'm supposed to do is write code so that the camera will find the coordinates of a swatch of color and move accordingly as the swatch changes positions. The robot is supposed to move from side to side...

I am creating a class that will transform a basic arithmetic expression from infix to postfix (Reverse Polish Notation (RPN)). Then after then, it will evaluate the postfix expression and give the answer. I have having a little trouble with the operators (+,-,/,0*, and %). Like, I have to...

I may be taking control of the running of some seismology equipment, which is run via C code. I know very very little about C code. Would it be better for me to spend the time to thoughroughly learn C, or could it be possible for me to convert the software to Java. I have a pretty god...

Build a GUI to accept integers (when the ENTER key is depressed) into an arr ay of 15 int; have a button called AVERAGE; when AVERAGE is selected, there is a display of the count and the current average; have a button called CLEA R; when CLEAR is selected, count is set to 0 and so are all...

Hey I'm new to this java stuff, I am taking my first class in it at the university of pittsburgh, and for my homework I need to write code to make a thing that will generate 10 random insults from a list of words. I have this outline to it and I was wondering if someone could help me fill in the...

I have to put a bunch of Java files (written in jGrasp) into one zipped folder and send it by email. The problem is that all programs work perfectly well when they are in an unzipped folder, but, when I convert folder into a ziped one, programs don't work. For example, I have user defined class...

Hello. I am writing a program, but I can't figure out how to do something. I want to do something like this: Sample input: abcdeft 01234567 asfgSample output: The length of line 1 is: 6 The length of line 2 is: 7 The length of line 3 is: 3

How come when I exectue this program, I get the follwing error. Just to let you know, what i am trying to do is, check if ever digit in a number is a prime number. import java.lang.Math; public class PrimeNumbers { public static void main (String[] args) { int[] test = {546513, 77777...

Please, I am in desprate need of soemoen that knows java. I need to turn in an assigment in 2 hours and I am trying to figure out something that I don't udnerstad. We are currently doing input and output stuff. I am trying to figure out how to count the numerb of lines, words, and chars in a...

I have built a program to answer the follwoing question. What is the smallest integer x >2006, such that x^7 and x terminate in the same five digits. The answer I get is 75800. But when I punch in 75800 in the calculator, for some reason, the last 5 digits for this number and 75800^7 are...

Hello. I have an assignment that asks me to create a program that asks a customer of a store to type in their name, and an amount of money they spent. Then the program calculates a dicount they get according to the amount of money they spend. And print the discount to the screen. But it...

In programming in Java I've frequently wanted to plot functions, meaning I've had to convert a double array of function values (and a corresponding array of their domain values) to integer arrays of coordinates to plot. I've always found this to be a pain in the neck, especially if you're trying...

the purpose of this thread is to be a placeholder for discussion about the performance of Java in Numerical Computations. Started as a discussion between CRGreathouse and me about weather or not Java can be used effectively in doing computations. The plan we have: Phase 1: Solve a...

I would like to be able to detect a click anywhere on the screen, not associated with any particular screen component, and in fact inside another program's window. I don't know if I can use the listener framework to do that--if I can, I don't understand how. Can I get a whole screen object to...

In Java, I am looking for a collection that will test if a given element is in a set, using the equal() method defined for the element. If it is in the set, I need the collection to give me the actual occurrence of the object from the set. Vector will do this for me via the indexOf() method...

I have a java animation- a ball flying up and down. Please help me to turn it into a movie because I want to see how it is played in winmedia player

I have only 1 day to work on my lab. Hope someone could help me as soon as possible. My problem is I don't know how to count how many objects are created in a class. The first assignment is write a Java class, Student, that has the following instance variables: name (String), age (int), gpa...

Greetings, Does anyone know a website with a java applet for a Single or Double-slit experiment? I'd like to mess around with the variables to learn the intricacies of how it works. Variables I'd like to mess with include: slit width slit thickness slit distance from screen incident...

I was curious if anyone knows if there are any methods to do the following in java. I'm writing a terminal based program in java, and it will be doing incremental updates. I want to output to the terminal the percentage done, but to replace the last output. For example: $>java jprog...

I need java to read a string and count how many characters are in it. I know there's some class that can do this. What is it?

I'm trying to create this program that allows the user to create and manipulate trees. For example, a user might create a new tree with a node containing "words" as its data, then create nodes containing "nouns", "verbs", "adjectives", etc. as their data. The problem is I don't know how to...

I'm on ubuntu linux. I've installed java 1.5 but at the command line, when I type java -verion I get 1.4. So then I type: export PATH="/usr/lib/jdk1.5.0_06/bin/:$PATH". I type java -version and get 1.5, but then when i close the command prompt and open a new one, it's back to java 1.4. Any help...

I'm interested in learning foreign languages. I plan maybe to study japanese linquistics in college. I'm learning spanish and japanese, but more japanese for now. I signed up for a yahoo account on yahoo chat on video games, but I keep getting very strange errors and it won't let me type in...

Hello all. I have never taken a programming class, but this next semester I am taking two. One teaches you Java, and the other is C. Will it be hard to learn both at the same time. I am very dettermined, and a very hard studier and hard worker. Has anyone else here learned two languages at...

Hi, I just updated to 5.0 and changed the java version from the java preferences as instructed in the installation instructions. However, from the terminal if I type java -version it shows that the 1.4 is still the default. Can someone tell me how to set 5.0 as the default from the terminal...

I want to lear Java MIDP which can allow us to create an mobile applications . Did anyone know where I can find the tutorial for free at the Internet ?

:redface: Is there a way to convert a character representation of an integer into an integer (with integer representation :rolleyes:)? *for example (I'll add 8 to a certain digit in an integer), String nmbr; //where I enter a number int pst; //an integer representing the position of that...

Java's "Scanner" Hello, I own a Macintosh and was trying to write a simple Java program for one of my classes. However, I quickly discovered that it appeared that the Mac does not have the Scanner ability. I get an error on the "import java.util.Scanner" line saying "cannot find symbol...

I want to start learning python. Lots of people I know say it's a very good language. Right now I know Java and a little bit of C++, but I'd like to experiment with some other languages, specifically Python. Right now I've got Python 2.4 installed on my PC, now I need to know what to do from...

What does an " ')' expected " error signify? How did I not use parentheses correctly? The error is in this line: System.out.println(num1 + " " + num2 + " " + num 3 + " " + num4 + " " + num5) ; What possible mistake can there be in parentheses?

I'm writing a program that likes to test for equality simply by checking identity: IOW, a.equals(b) iff a == b. Now, I think I would like to use HashMap's and stuff... so I would like to be able to use the appropriate accompanying hashCode method... that is, the default implementation of the...

http://www.falstad.com/mathphysics.html I cannot begin to estimate the love affair I will have with this site. This just seems like an invaluable tool for students, and anyone at all who is even passively interested in math and physics. (I apologize if it has already been mentioned...

hi, i know there are 7 ways to declare main in java as 1.public static void main(String args[]) 2.static public void main(String args[]) but what are the other ways? but only change first two keywords i.e. public and static and use the required keywords. this is the question...

Your task is to create a Java program with the name that asks the user for 5 integers in the main method that are between 0 and 9, inclusive. You should then write a method called “permutations” which accepts these 5 integers and prints all possible permutations for those numbers. (Hint: You...

Hello. please tell me how can I download java applet in my computer from any website. thanks

Computer Science Java Programming Help! Determine whether or not an integer given by the user is a prime number. You may assume that the number is greater than or equal to 2. You may conditions that are in the form “if x is divisible by y” when writing your algorithm. HINT: One way of...

hello everyone, thanks for taking ur time reading this po i need help with something to do with java, designing an application to read sentences & words from a txt file, and create a new txt file, with all the words (in single) from the original txt file, next to each word, containing the...

Hey I hava a java programming assignment for my intro to java class... I've written my program but I don't know how to make the "new balance" my balance for the second time it runs and so on.. Q)Save the programs as ccard1. Take a credit card balance of $500. Calculate the 5 months the...

Hi, I'm working through the "Building an Application: Part 2: Introduction to Inheritance, Panels, and Layouts" on java.sun.com and the code I've written compiles fine, but the images that are supposed to appear in the JPanel aren't there. jl = new JLabel("Java Technology Dive Log", new...

Alright, I did the whole Hello World! thing, but I got stuck on one part. I downloaded the Sun.Java thing, but now when I go into the command prompt and to try and compile it... the computer does not recognize the "javac" command. What's going on? Is there another program?

Next semester I plan on taking a comp science class, and my school seems to mainly teach java. I always considered the standard language to be c++, I think it was a few years ago here, but I guess they recently switched over. My questions are: Are there any major differences...

So, I have to create a program that makes a new array with 20 slots, then it asks you to enter a value into each index, which I have here: import java.io.*; class ArrayLoop { public static void main (String[] args) throws IOException { int[] array = new int[20]; for (int i...

In terms of enterprise web development why would you choose Java over Python/Perl/PHP? I ask this question because I've done significant web development with both Python and PHP and have recently been dabbling with jboss/tomcat/j2ee and have found that Java is very cumbersome. Not only is it a...