35,618 Topics
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| | Hi My issue is i cant get the arrys correct,with abstract class.Can some one highlight to me the error in class Example1.I want to create 2 extra pets (iguana & hamster) but i am getting it wrong. below are the errors from my complier 23.java:37: error: constructor GoldFish in class …  |
| | hi, i read through a few website ,gone through a few examplebut i am still getting 01 error in my code? Error message: goldFish.java:11: error: cannot find symbol void perform(){System.out.printIn(this.action); ^ symbol: method printIn(String) location: variable out of type PrintStream 1 error abstract class Pet { abstract void perform(); } …  |
| | I made a custom JTextField that only accepts numbers into the textfield. I used insertString to do this. Tt works pretty well except it allows oddly only the letter e. It accept e only after a number is inputted first. And once e has been entered the textfield does not … |
| | Hello, I am writing a simple program for my Java class and I keep getting this annoying error that after reading the code over and over again, I just can't see where the error is originating from. Anything obvious sticking out? Here is the error: Exception in thread "main" java.util.InputMismatchException … |
 | hi all , I develpoed java application i java swingss, I need tocreate two versions linced version and trail version, Trail version should experied in 20 days,once user gives the serieal key the application shold work , where shold I store registration key, How could I protect my application could … |
| | Hi all, I have a slight problem when checking if a "Token" is in my StringTokenizer string. My code: import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.lang.String.*; import java.util.*; public class TextAnalyser { public static void main( String args ) { StringTokenizer stringTokenizer = new StringTokenizer("You are tokenizing string"); System.out.println("The … |
 | Okay, I am going to go through ALL my steps thus far just so that this process can be sped up hopefully. I have done this before, but it was awhile back and I forgot how, but I know it is possible. 1. I made a Neatbeans created Java Application. … |
| | hello everyone, I am developing an application for my project... My application works correctly when I run it on applet viewer...But when i try to run it with the help of html page ..the code does not run and gives an erron java.security.accessdenied exception.... Actually i have loaded an image … |
 | As I mentioned in an earlier post of mine that I have my computer exam on th 26th March 2012.. So I was just wondering if anyone could provide me with some programming questions for my school level which I could practice on my own. If anyone is posting me …  |
| | **Hey, Hi all! I'm a bachelor student, new to Java. Following code is giving error in PrintDetails() What parameters should I define in it?? Kindly check and tag out my mistakes in the following code.. Thanks ^_^** class student { String a;String b;char c;double d; student(String name,String rollno,char gender,double gpa) … |
| | Could anyone tell where is the error in the program? There is a compile-time error... When I hit compile it shows error in the 40th line saying that 'r' might not have been initialised.. I can't get that.. Pease could anybody help?? import java.util.Scanner; public class Customer_Account { public static … |
| | I need to take arguments and change the extensio of the file for writting but I get java.lang.ArrayIndexOutOfBoundsException: 1 Why? Is there any better way? // change file name for saving the output file int dot = inputFile.lastIndexOf('.'); // check for the dot String baseName = (dot == -1) ? … |
| | Open the project space in greenfoot and study the codes of the classes Space and Asteroid. 2. Modify the constructor so that the space world paints 300 stars. To paint a star you write the following code: GreenfootImage star = getBackground(); star.setColor(Color.WHITE); star.drawOval(50,50,2,2); this will draw a small white star … |
| | Hi. I have problem adding text box after each label ID Code, Weight, Rate, Price Charge, it does not show when i run the code. Also, how do i add the $ sign when display the price charge. the ouput should be like this: Fee Calculator ID Code: [Text Box] … |
| | Hey, all I'm working on a homework assignment which includes the creation of an insertion sort method to go through an Array List of basketball games. The basketball games are formatted: public Game (String homeTeam, int htScore, String opponent, int oppScore) { this.homeTeam = homeTeam; this.htScore = htScore; this.opponent = … |
| | I'm developing an Intrusion Detection System program....right now, I have written some of the code, but I'm having a lot of difficulty testing it, because I don't have any virus infected systems to test the code on....is there any way I can develop a worm just for testing purposes?...or is … |
| | Hello, I am trying to create images from files in a Java ME program, but sometimes the Image.createImage("filename") is returning null without throwing an exception. It works fine for some images but not for others. I've even renamed a non-working image to the same path as a working one, and … |
| | hi, I installed NetBeans IDE 7.0 but when I tried run it this message keeps on appearing"see no.1." I tried to uninstall it but an error message also pops-up "no. 2". I tried changing the conf. but it keeps on saying access denied. please guys I need your help >.< … |
| | Modify the constructor so that the space world paints 300 stars. To paint a star you write the following code: GreenfootImage star = getBackground(); star.setColor(Color.WHITE); star.drawOval(50,50,2,2); this will draw a small white star at location (50,50) with dimensions 2x2. Draw 300 stars with the same dimensions but at random locations. … |
| | I have been using some open source software, like weka/mallet to fulfill certain data analytics works. I know how to use the APIs of these softwares and write customized code under Eclipse. Right now, I would like to learn how to make this type of data analytics work as a … |
| | I want to create a java application where you can build simple logic circuits (just started learning java recently and it was just a random project idea I got off the net) Ultimately I want the gates as icons on a pane that users can drag and drop onto a … |
| | I have problem , I only get program to write the frist line but how to write the whole string? When I print that string I get correct ouput? It has 10 lines String fileName = "System.err"; File newFile = new File(fileName); try { if (newFile.exists()) { FileWriter fos = … |
| | I have a problem with writting this program I need to read a csv file and write it to binary then read it again. I has to be written in this way: Field name Data type Name First Text Name Last Text Birth Day Whole number Birth Month Whole number … |
| | This is the instructions Program converts American football plays into scoring points Touchdown – 6 Extra point after touchdown – 1 Field goal – 3 Touchback – 2 Program reads play-name and uses “if-statement” to decide how many points to award Program does calculations in a loop to allow more … |
| | So ive been trying to get an average of this array needed, and I seem to be having trouble with it. So far, my current code just adds the numbers up, but doesnt really average them out at all: [CODE]import java.util.Scanner; import java.util.Arrays; public class Grades { public static void …  |
| | import java.util.Scanner; public class EventFrequency { /** * main method: * ask the user for the average number of events per time interval * (lambda) and the number of time intervals to observe * draw a horizontal and vertical histogram of the number of heads */ public static void main(String[] … |
| | This was the assignment: Write a class with methods to help you balance your checking account(an object class-main method is not in this class). The CheckingAccount Class should have at least two instance variables: the balance and the total service charges, along with methods to get and set each instance … |
| | Hi Why am i getting error i the below code. abstract class SuperHeroes { abstract void perform(); } class IronMan extends SuperHeroes{ String action="Blowing bubbles"; IronMan(String action){ this.action = action; } void perform(){System.out.printIn(this.action); } } |
| | I'm making a connect 4 like game in Java and everything I choose a column to drop the piece it goes where I want it to however, when I want to drop a piece on top of that I, my program throws an error and makes me select another move. … |
| | Hello, I was looking for a way to post multipart/form data to a servlet using java standalone application. Any information would be helpful. |
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