Java Forum

Hello, I am a new Java learner. I would like to develop one model by using Java. In that model, there are many files to read. I want to write a method in Java to read a file and store the data in array(s). Later, I just only call that method to read other files. Would you please help me to write a code to read the data in the following formats: ...

I hope I can get some pointers about multiple precision integers in here. My lecturer has given us a task about using java big integer class. I use calculator to calculate 2 to the power of 128 and result is this: 3.4028236692093846346337460743177e+38 What does this 'e+38' mean? How multiple precision numbers are being processed in a...

Hi everyone, Please help me accomplish the following : 1. how can i copy a file in java then paste it in a desired location 2. how can i run a .jar file run by just double clicking on it.... I need to know the answer asap... please reply asap... thanks.

I found this example on a web page Enumeration enum=v.elements(); while(enum.hasMoreElements()) { String elemento=(String)enum.nextElement(); if(elemento.equals("tres")) { System.out.println("Encontrado tres"); break;

sum of two varaibles without using mathematical operators.

First of all I'm new to this site but it certainly looks like a place that i will be visiting more often! Onto my problem. I am creating a Hotel Bussiness project in java using BlueJ The classes are as follows: Hotel - Deals with the major functions of the hotel (i.e guests booking in, finding rooms etc.) Room - Used to decide whether a...

Hi all, I was rather suprised to find that the String java api doesn't contain String.contains(char aChar) method. It has a similar method for a charsequence but not one for what i need. So unless someone tells me im wrong I ve come up with a another way. If i have a char aChar = 'x' then a String aString = "test"

hi i have one dropdown control on my jsp form and want to retrieve the value of mysql database field. "Country_Id1 = rs.getString("Country_Id");" using i get that value <select name="countryId" > <option selected="" value="1"> India </option> . .

I am doing an assignment and following is part of the question: A program is to be devised for a university to work out whether or not, a student or a professor, is outstanding. The criterion for a professor to be outstanding is to have over 120 publications. The criterion for a student to be outstanding is to have a Grade Point Average of 3.3....

Hey, I just started programming this September and I have an assignment in which I am supposed to create a hangman game. This is my first post on this forum so forgive me for any "noob" mistakes Now I'm still learning Java so this will be a basic program running in the console window (no GUI) using strings loops, arrays, etc but hopefully nothing...

I need the program to prompt the user to input an odd number between 3 and 79 and then the output will look like this: for example if they input 5: * ** *** **** ***** or 9:

Hi, I am working in JSP code.A Menubar is displayed in JSP page.It's working fine in IE. But in case of firefox the very first menuitem is not working.If i move that menu item as second means it's working fine.Can anyone help me on this. XML code used: <menubar key="menubar_home" url="Home.do"/>Home

Hi,This is my problem which my work want me to solve: This system is intended to provide the school timetabler with information to support his/her timetabling activities. Please note it is not expected to schedule classes. The information required are the programmes, the core and option modules for each programme, the activities (lecture,...

Hello, I am teaching myself java and am completely stuck. I am using the java development kit and vista command prompt to compile and interpret programmes. I am getting error codes which don't make sense because they refer to a code that seems all right to me. Here is the code: class calculator { public static void main(String arguments)...

Does anyone know how to compare contents of two ArrayLists? I want to compare them to see if they match up. Do you have an example or could you point me in the right direction. I know I need to loop through it with an if statement a for loop somehow or both, but I am not sure how. thanks for any help you can provide-

I need to display the sum and the average without initializing num and num2. I can't figure it out and it's killing me. I can't seem to get the sum or average displayed without assigning the varables values. Any help? -------------------------------------------------- import java.io.*; import javax.swing.*; class Numbert

Hi Everyone. Need some help. I have no ideal how to start this. my arlist is as followed static ArrayList arlist; arlist = new ArrayList<ticket>() I do not know where to go after this how do I compare a value with a class method??? ie empid it does not work, it tell me I can not because its static Here is what I have so far

hi! I am from india .I am new to Java.Presentlly i am working on project in which i need to use mysql. I had set up an development env.for the same .I had installed mmsql jdbc driver also. i am using apache-tomcat-jsp-mysql. but when i ran an servlet which includes mysql db it gives error like "Access denied for user 'root'@'localhost'...

Today I came across a thing, is it possible to change the Standard Output Stream? Then I immediately went for assign the System.out variable. System.out = new PrintStream(new File("some_file_name")); Then I got a message, the final variable not to be updated. Then I came to know that I have to take help from API,

why can't we just extend the class that will be using the clone method in order to be able to use it without overiding?

i created and ejb in deploytool then added web content to it i added index.jsp in file refs as a welcome file i added ejb refs but when i deploy it i get 404

So I have my Algorithms class tonight and I want to get the lab done before or during the class. I have write a recursive method that takes an int as a parameter and also returns an int. It has to REVERSE the int. What the heck. I'm not allowed to convert it to a string or anything, it says that I will not get credit if I do. So could someone...

I am looking for a Java Decompiler... preferably free. Any suggestions. Ease of use isn't a problem as long as it does a fair job.

Friends, I need some inputs about my java program. My program is supposed to store 3 information into an ArrayList so-called arrayOne at each runtime: 1. Unique ID 2. Boolean Value 3. data. Let's assume I give first input a = 5, compile & run: Result - arrayOne. Second Input a = 24, compile & run: Result - arrayOne. Aim: To compare...

hi frnds, im doing a project in struts... my project specifications- struts1.1,tomcat5.5.23,eclipse3.2. the situation--> i have a form where i have a html <select> attribute in the <option> tag,inside the option tag is supposed to have the value of the string say s3..when i select the value from the select attribute and click submit the...