JSP :: How To Return List Of Data From Java Class To File
Jan 2, 2015i'm using eclipse Kepler to create J2EE project.i created student class which return list of information. how to access list in JSP page??
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Using Data From One Class In Another In Single Java File?
Apr 20, 2015I am trying to create a second class in a single java file (first time trying this) and want to use data from the first class in the second class but I am not able to do it. What am I missing :
package simplecommissioncalculation;
import java.util.Scanner; // import java.util.Scanner
public class SimpleCommissionCalculation {
public static void main(String[] args) {
[Code] .....
List Interface Class That Has Operations For Linked List And LList Class
Oct 6, 2014I have this ListInterface class that has operations for my linked list and a LList class. The Llist and ListInterface classes are perfect. My job is to create a driver, or a demo class that showcases these operations. That being said, heres the driver so far:
import java.util.*;
public abstract class DriverWilson implements ListInterface
{
public static void main(String[] args)
{
LList a = new LList();
[code]....
Sort Linked List Through The Nodes Of List - Data Of Calling Object
Feb 14, 2014I have some class called sorted to sort the linked list through the nodes of the list. and other class to test this ability, i made object of the sort class called "list1" and insert the values to the linked list.
If i make other object called "list2" and want to merge those two lists by using method merge in sort class. And wrote code of
list1.merge(list2);
How can the merge method in sort class know the values of list1 that called it as this object is created in other class.
Swing/AWT/SWT :: Java GUI With Separate Class For JList - Adding Items To The List?
Sep 19, 2014I am trying to create a GUI interface in swing which consists of four classes: a GUI class, which creates a main JPanel, a label, and a JList, which it takes from the second class, a MovesList class that contains a JList and the stuff needed to interface with it. It also has a main class, which basically just creates an object of the GUI class for the main window, and an Other class from which I would like to be able to add an item to the JList. I created methods in the MovesList class to get each component (like getMoveslist, or getMovesListScrollPane), which I then used to create the JList in the GUI class. I also created an addMove method so that I can add an item to the JList from any class through a MovesList object. However, this addMove method only works when called from the GUI or MovesList classes -- it does nothing when I collect from the Other class.
Here is my code:
//Main class
public class TestProject {
public static void main(String[] args) {
GUI mainWindow = new GUI();
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
[Code] ....
When I run this code, I get a window with a JLabel that says "Moves," and a JList that contains five elements -- test 1-test 5, but not a sixth "test from other class." ( using the add move method ) However, when I click on the window, the addMove method is also called, and successfully adds "test 6" to the list.
How To Share Data Between Java Class And Servlet
Jan 22, 2014I'm trying to share an hashmap(or any other stuff to share data) between a java class and a servlet. The hashmap has to be filled into the servlet with some data and then I have to get those data from the java class.
What is the best approach? I cannot use a DTO because I have several concurrent requests to my servlet.
Java Class Person - Adding Data To Text
May 5, 2014Your Tester class main method must use an array or an ArrayList of Person objects. It must be populated from a text data file, friends_data.txt. Add the following data to your text file,
Michelle, 12/20/2008, Camilla
Bryan, 3/8/2007, Tom
Camilla, 6/7/2005, Michelle
Tom, 10/15/2007, Bryan
Charlotte, 3/2/2008, Michelle
Each line has the meaning:
-Person name, Person date of birth (MM/DD/YYYY), name of best friend
-Write a Java program that reads in the data from the friends_data.txt file, allocates a new
-Person for each and then stores the newly created object in either an Array or an ArrayList.
-Next print out a report showing the following information for each Person,
1. The Person's name
2. Their popularity counter
3. Their age on May 1, 2014
4. The name of their best friend
5. The age of their best friend on May 1, 2014
Finally, print the name of the most popular Person and the name of the oldest Person.
Person Class
import java.util.ArrayList;
public class Person {
public String personsName;
public String personsFriend;
public String personsBirthday;
public int personsPopularity;
public int popularity = 0;
[code]...
I keep getting this error from the compiler:
System.out.println("Popularity : " + personsOfInterest[i].getPopularityNumber());
"method getPopularityNumber in class Person cannot be applied to given type:
Required: java.lang.String[]; found: no arguments; reason: actual and formal argument lists differ in length.
How To Load XML File Inside Of Java Class File In Netbeans Project
Feb 26, 2015try {
File configFile= new File("C: Documents and SettingsstudentMy DocumentsNetBeansProjectsCDASsrcconfig.xml ");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("config");
[Code] .....
This code is working properly but i have use path like this
File configFile= new File("srcconfig.xml");
Instead of system directory path i have to use path inside of project but i am getting an error-cannot find the specified file...
Java - Getting Data RFID Serial Rs232 In JFrame Class
Apr 14, 2014**Getting data on from rfid scanner as Serial rs232 port in JFrame**, in this case I have made a JFrame form and I have a JTextField for storing data rfid as a String. Actually, I found a class from internet that read the RFID reader as byte, now How To get data from my RFID Class to my JTextfield Jframe in my main class as String?
Here my RFID class :
package view;
import java.util.*;
import java.io.*;
import javax.comm.*;
public class ListPorts implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;
[Code] ....
Is it possible that my RFID class merge with my Main class ?
Using JAVA Scanner Class - Manipulate And Generate Data Dictionary Add Cards For Each
Feb 24, 2015I have a string of variable tags (tag) filled with variables, and using a Scanner (scan) to manipulate and generate data dictionary add cards for each. The variables are delimited with new line character, and the variables are structured such that the actual name of the variable contains info as to its data type, size, etc. What I need to do is move the scanner to a particular point into the string then use .nextInt() or similar. I don't want to do this to the whole variable, just where I start it from. How can I do this?
E.g..
/* variables in String tag...
ANS_s20Tx12VDstr
ANS_:Tx67MSvis
ANS_zRx11MSctr
...
..
*/
Scanner scan = new Scanner( tag );
int ptr = tag.indexOf( "_" );
ptr++;
if ( Character.toLowerCase( tag.charAt( ptr ) ) == 's' )
// then start at the "_" character and grab the nextInt()
How To Write Java Data To Pdf File
Apr 9, 2014how to write java data to pdf file
View Replies View RelatedAccept List Of Integers As Parameter And Return Number Of Times Most Frequently Occurring Integer
Nov 20, 2014Write a method maxOccurrences that accepts a list of integers as a parameter and returns the number of times the most frequently occurring integer (the “mode”) occurs in the list. Solve this problem using a map as auxiliary storage.
If the list is empty, return 0.
Java Code Removed Data From XML File
Jul 16, 2014I tried working with XML today, since that's what my book teaches. First, I read some data about Product objects that are suppose to represent products with a code, description, and price. That worked fine. Then, I tried creating a writeProducts(ArrayList<Product> products) method, and man it did not go well.
How it works is that there is an ArrayList instance variable in the class that keeps track of all of my products after the readProducts method returns that ArrayList from the XML file. When I ran the method I had a lot of stack traces printed. I then checked the file on a web browser and an editor, and saw it was completely empty. Here's the code:
import java.util.ArrayList;
import java.io.*;
import javax.xml.stream.*; // StAX API
public class XMLTesterApp {
private static String productsFilename = "products.xml";
public static void main(String[] args) {
System.out.println("Products list:");
[Code] ....
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds) mh_sh_highlight_all('java');
On a side note, is it normal if almost everything I writer has to be debugged?
Comma Separated Data Set - Return Values In ArrayList
Feb 18, 2015I am trying to write a program that will take any comma separated data set and return the values in an arraylist without any commas. Like if I input "hello, world, program, java" it would output an arraylist [hello,world,program,java].
public void run(){
String line = readLine("Enter a CSV-formatted line of data: ");
int lowerBound = 0;
String entry = new String("");
ArrayList<String> string = new ArrayList<String>();
[Code] .....
Return Array Data From A Method Back To Main
Mar 16, 2014I'm trying to return an array back to main. The array returned to main should contain the reversed random numbers array. I believe I have the array correctly reversed within the 'reverseArray' method. I'm trying to send this array back to main, but it appears to contain empty data (a bunch of zeros).
Java Code:
class ArrToMain {
public static void main(String[] args) {
final int NUMBER_OF_ELEMENTS = 1000;
double[] numbers = new double [NUMBER_OF_ELEMENTS];
//Invoke initialize method
initialize(numbers);
[Code] ......
Method Must Return Int Type - If Given Integer Is Strong Return A / If Not Return B
Sep 7, 2014I want to use a method, which takes for example an int and also returns an integer. For example, if the the given integer is strong return a, if it is notstrong return b. How would you write that in a Code?
I want to use that in a more general way. I want to give a method mlong the value X of the type date and let it return an int. Type date consists of 3 int, one of them is the int month.
mlong should return an int depending on the X.moth. at the moment my code looks like this:
// File1:
public class date {
public int day;
public int month;
public int year;
}
// File 2:
public class monthlength {
public int mlong(date X) {
int t;
t = X.month;
if (t == 1 || t == 3 || t == 5 || t == 7 || t == 8 || t == 10 || t == 12)
{ return 31; }
if(t == 4 || t == 6 || t == 9 || t == 11)
{return 30;}
}
}
Adding Data File Into Two Separate 2D Arrays In Java
Apr 27, 2014I am having some trouble with a Java program. I have a txt data file, which I will display, that I need to add into two separate arrays. The text file is 8 lines long that is supposed to go into two separate 4x4 matrices. A little background info on this program, reads in two arrays, compares them and outputs the largest elements of the same index and outputs them in a separate array. I somehow cannot seem to figure out how to do this. My code is below:
Data File:
2 7 6 4
6 1 2 4
9 7 2 6
8 3 2 1
4 1 3 7
6 2 3 8
7 2 2 4
4 2 3 1
Code:
public class prog465a {
public static void main(String[] args) {
Scanner inFile = null;
try {
inFile = new Scanner(new File("prog465a.dat.txt"));
[Code] .....
Building Linked List Whose Nodes Data Is The Sum Of Nodes Of Other List
May 1, 2014 public void add(int d){
listNode l = new listNode (d, null);
l.next = first;
first= l;
}
public list Sum2List (list l1, list l2){
//variables
int sum;
[Code] .....
But I have a problem in my first listNode where it ll be pointing to null, thus in the sum2List method the program checks the while condition into false and doesn't go through the loop.
Populate ArrayList Of Different Data Types From Text File With Java
Aug 25, 2014I would like to create an ArrayList from data types stored in a text file.The ArrayList would be multidimensional with two data types; int, String.
Example text file could be:
4 cahiers grand format
3 stylots bic bleu
5 gommes
I find it very difficult for multiple data types i don't see how its possible.
How To Improve File Reading Efficiency And Its Data Insertion In Java
Feb 8, 2014We have an autosys job running in our production on daily basis. It calls a shell script which in turn calls a java servlet. This servlet reads these files and inserts the data into two different tables and then does some processing. Java version is 1.6 & application server is WAS7 and database is oracel-11g.
We get several issues with this process like it takes time, goes out of memory etc etc. Below are the details of the way we have coded this process.
1. When we read the file using BufferedReader, do we really get a lot of strings created in the memory as returned by readLine() method of BufferedReader? These files contain 4-5Lacs of line. All the records are separated by newline character. Is there a better way to read files in java to achieve efficiency? I couldnt find any provided the fact that all the record lines in the file are of variable length.
2. When we insert the data then we are doing a batch process with statement/prepared statement. We are making one batch containing all the records of the file. Does it really matter to break the batch size to have better performance?
3. If the tables has no indexes defined nor any other constraints and all the columns are VARCHAR type, then which operation will be faster:- inserting a new row or updating an existing row based upon some matching condition?
Java Servlet :: Read Data From Excel File To Table
Oct 19, 2014If I want to load data in excel file into table. what is the best way to do it?
View Replies View RelatedHurricane Java Project - Read Information From Data File And Run It Through But Program
Dec 2, 2014I am now stuck. I am writing a program that reads information from a data file and runs it through but program. However, I am almost finished with the program, but cannot figure out the last few parts.
public class Storm {
private final double KnotsToMPH = 1.15;
// global user-defined types:
private int beginDate;
private int duration;
private String name;
[Code] .....
I have not attached the data file because it contains a total of 360 lines of hurricane information.
Why Can't Get Return Value To Conversion Class
Oct 13, 2014why i cant get the return value to my conversion class.
import java.util.*;
/*
*
*
public class MetricTest {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// declare a sentinal to exit the loop
String check = "Quit";
[code]....
Create A Java Program That Can Read Specific Data Within Csv File To Work Out Averages
Aug 7, 2014i am fairly new to java but have made a few projects so i do know most aspects that would allow me to complete the task its just i have been stuck at the same place now for 2 days.The project is to create a java program that can read specific data within a csv file to work out the averages etc. The csv file is a database of different weather stats . an example of the first 12 months of the csv file is below..
[CSV FILE]
year ,month,average rainfall etc
1946 15.70.616108.131.5
1946 28.23.56111.871
1946 38.82932.9 102.9
1946 414.16.3029.2 150.5
1946 513.96060.7 143.6
[code]...
I know that once the data is indexed i can than use a double to find the average of the 12 specific pieces of data and so on. once this is complete i should than be able to transfer the data to a simple graph.
Class Name And File Name In Java
Dec 3, 2014why should the class name and the file name should be the same in Java.Is it because it makes it easier to organize and maintain your code?
View Replies View RelatedReturn Array Contain All Object Name Of A Class
Mar 16, 2014I need to return all the object name of one class in an array. I have a class named country, and other classes with athletes and medals etc. I need to do a method that list an array with all the countries that participate, so all the objects created with the class country (i.e canada.country, usa.country, etc). Is there a way I can retrieve them?
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