Populate JComboBox With ArrayList

Oct 2, 2014

I'm trying to populate my JComboBox with an Arraylist. Using two different classes, a GUI class (with the JComboBox - called it MainGui) and a class where I extract information from a database and put it into an ArrayList (which I call databaseconn).In my databaseconn class, I can print out the content of the ArrayList perfectly fine, but when I try to do it in my GUI class it just prints empty brackets "[]".(What I need it to do is to populate the drop down list in the JComboBox with the hotel information).Here's my code:

//The dataaccesslayer you should use for classes that deal with connection to the database

package dataaccesslayer;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

[code].....

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How To Populate Jcombobox From MySQL Query

Sep 13, 2014

How could i populate jcombobox2 from MySQL depending upon the value of jcombobox1??

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Dec 4, 2014

I am trying to populate a JTable using Several JTextFeild a JComboBox and a JLabel.

The textfields are originalPrice and itemName

JComboBox is departmentComboBox

label is salePriceLable.

When hitting the button i need the program to calculate the price after discount and add the item name, department, original price, and discounted price to a table. I have the calculation down, but am lost on populating the table.I used NetBeans 8.2

/*
* Program: JavaRetailCalculator
* Purpose: To calculate the ammount of a discount and display results in a Table
*/

import java.awt.*;
import javax.swing.*;
public class CalculatorFrame extends javax.swing.JFrame {
/**
* Creates new form CalculatorFrame
*/
public CalculatorFrame() {
initComponents();

[Code] .....

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Populate ArrayList Of Different Data Types From Text File With Java

Aug 25, 2014

I 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.

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Create Own ArrayList Using Collection Without Implementing ArrayList Itself

Feb 28, 2014

I'm trying to create my own arraylist using Collection. My program doesn't do anything. Obviously, I haven't a clue.

import java.util.Collection;
import java.util.Iterator;
public class MyArrayList<T> implements java.util.Collection<T> {
private int size = 4;
private T[] mArray;
public MyArrayList(String[] args) {

[Code] ....

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How To Populate Jlist Using MySQL

Apr 22, 2015

I don t know why this throw a nullpointerexception. i want to add rows from mysql database to my jlist, this is my method populateJlist().

public void populateJlist() throws SQLException {
conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/agenda","root","");
DefaultListModel m = new DefaultListModel();
statement=conn.prepareStatement("SELECT *FROM apunte");
rs=statement.executeQuery();
String itemCode;

[code]...

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Jan 6, 2014

I am relatively new to Java and I am only beginning to learn about SQL. I have some basic's down but I have been wondering is there a way that I can add data to my database using loops instead of having to physically code every row/column individually ?

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Populate Array From Database

Apr 14, 2015

I have this working manually, but need creating this from a DB Connection and populating the Array with the results. I just need populating "DestinationItem[]" from the SQL below
 
DestinationBean.java
//  Manual Array works but I need this to be populated from DB using the below Query and DB Connection info.
    private DestinationItem[] destinationResults = new DestinationItem[]{
            new DestinationItem("58285", "Dodge Grand Caravan"),
            new DestinationItem("57605", "Dodge SX 2.0"),
            new DestinationItem("58265", "Chrysler 300 Touring")

[Code] .....

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JSP :: Dynamically Populate Drop Down List?

Dec 2, 2014

I'm having an issue with populating a dropdown list in my HTML form.

I want the form to pull in the values from the Database. I have a connection and I'm able to populate a table with the values.

Now I'm trying to populate a dropdown within a form that will bring in currency codes that are in a column called CURR_CODE from the Database.

<%
//Declare variables
//String con_currency_sdo = ""; // as New Connection
String ResultSet = "rs"; // as New Command
String Statement = "stmt"; // as New Recordset
String selBaseCurr = request.getParameter("CURR_CODE");

[code]....

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Jul 19, 2014

I am using JSF,richfaces. Need to import data from Excel file and show it in datatable.

How to achieve this?

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How To Populate JTable By Selecting ComboBox Value

Sep 25, 2014

How can I populate the jTable in my form by selecting value from combo box. And remember I have database as well.

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How To Create A Loop To Populate Activity

Dec 5, 2014

I'm working on my Android project where I created Expandablelistview with men's and women's sports. Now I have to populate each sport with my text data which contains events. I'm stack at this point, already tried few thing but that did not work. Here is my data how it looks like:

this Main (id=831962574768)
groupedFeeds ArrayList (id=831963150464)
array Object[12] (id=831963153088)
[0] GroupedFeed (id=831963152968)
category "Women's Golf" (id=831962986192)
feeds ArrayList (id=831963152992)
[1] GroupedFeed (id=831963153592)

[Code]...

I have here my Main method where I have to pass data to each of my sports(activities). I tried to create a for loop and then pass result to my sport(activity) but I'm doing something wrong and can not get that work. Here is my code:

GroupedFeed findFeed(String locateSport){ //here I tried to create a loop which gonna search for certain sport in array list
//and then pass it to gfResult. }
public boolean onChildClick(ExpandableListView parent,
android.view.View v, int groupPosition, int childPosition,
long id) {
switch (groupPosition)

[Code]...

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JSP :: Conditionally Populate Attributes Inside Div

Feb 3, 2015

I have the below snippet of code :

<div
<c:if test="${! empty properties['mediatitle']}">
media-title="${properties['mediatitle']}"
</c:if>
<c:if test="${! empty properties['mediawidth']}">
media-width="${properties['mediawidth']}"
</c:if>
</div>

What i want to evaluate the condition inside the markup that is getting populate. Such that If :

Title is empty markup will generate like : <div media-title="title" />

Both are available then markup will generate like : <div media-title="title" media-width="104"/>

How can i achieve this.

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JSF :: Populate InputText And Its Value Corresponding Of Size Of List

May 8, 2014

I will implement a page where I have a List<String> account, then it will populate inputText and its value corresponding of the size of the List.

For example, I have 10 values in List<String> account, it must populate 10 inputText with value on it and an empty inputText beside it (for the user to input some values on it).

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Declare Array And Populate It With Log Formula

Feb 10, 2014

Still trying to get a handle on arrays! So, I declare an array to be a 46x1 and I am trying to populate it with a Log formula that I am using but I keep getting an ArrayIndexOutofBoundsException.

Code :

private double[][] LNValues = new double[46][1];
//Calculating y=LN(E-k) and Initializing the Array
for(int x=0; x<LNValues.length; x++)
{
double i = Math.log(eValues[x][1] - kValue);
if(i > 0)

[Code] ....

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JSF :: Populate PickList - Value Is Not Valid Message

Jan 16, 2015

I am creating a JSF 2.0 project, and I am facing a problem when using the rich:pickList (richfaces 4) component with a custom converter.

I can populate the picklist left column rightly. But, when I move some item from left list to the right (by clicking in the pickList "add" button) and I try to submit the form that contains the pickList, I receive the following error message:

"mainForm:picklist: Validation Error: Value is not valid"

I have already overridden the methods equals and hashCode in my model class (Pessoas.java), but the problem remains.

cadastroEvento.xhtml
<rich:pickList id="picklist" converter="ApresentadorEventoConverter" value="#{CadastroEventoBean.pessoasSelecionadas}" var="pessoa" sourceCaption="Pessoas disponíveis" targetCaption="Pessoas selecionadas" listWidth="365px" listHeight="250px" orderable="false">
<f:selectItems value="#{CadastroEventoBean.pessoas}" />
<rich:column>

[Code] .....

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Populate Array With Leading Zeros

Nov 18, 2014

why I need to populate an array with leading zeros. It sounds like it wants me to populate the entire array for one number (string). When I use next(), it separates the numbers so why do I need to go the leading zeros route?

This assignment will give you practice with external input files and arrays. You are going to write a program that adds together large integers. The built-in type int has a maximum value of 2,147,483,647. Anything larger will cause what is known as overflow. Java also has a type called long that has a larger range, but even values of type long can be at most 9,223,372,036,854,775,807.The approach you are to implement is to store each integer in an array of digits, with one digit per array element. We will be using arrays of length 50, so we will be able to store integers up to 50 digits long. We have to be careful in how we store these digits. Consider, for example, storing the numbers 38423 and 27. If we store these at the front of the array with the leading digit of each number in index 0 of the array, then when we go to add these numbers together, we're likely to add them like this:

38423
27

To simulate this right-shifting of values, we will store each value as a sequence of exactly 50 digits, but we'll allow the number to have leading 0's. For example, the problem above is converted into:

0000000000000000000038423
0000000000000000000000027

Now the columns line up properly and we have plenty of space at the front in case we have even longer numbers to add to these.The data for your program will be stored in a file called sum.txt. Each line of the input file will have a different addition problem for you to solve. Each line will have one or more integers to be added together. Take a look at the input file at the end of this write-up and the output you are supposed to produce. Notice that you produce a line of output for each input line showing the addition problem you are solving and its answer. Your output should also indicate at the end how many lines of input were processed. You must exactly reproduce this output.

You should use the techniques described in chapter 6 to open a file, to read it line by line, and to process the contents of each line. In reading these numbers, you wont be able to read them as ints or longs because many of them are too large to be stored in an int or long. So youll have to read them as String values using calls on the method next(). Your first task, then, will be to convert a String of digits into an array of 50 digits. As described above, youll want to shift the number to the right and include leading 0s in front.

The String method charAt and the method Character.getNumericValue will be useful for solving this part of the problem.You are to add up each line of numbers, which means that youll have to write some code that allows you to add together two of these numbers or to add one of them to another. This is something you learned in Elementary School to add starting from the right, keeping track of whether there is a digit to carry from one column to the next. Your challenge here is to take a process that you are familiar with and to write code that performs the corresponding task.

Your program also must write out these numbers. In doing so, it should not print any leading 0s. Even though it is convenient to store the number internally with leading 0s, a person reading your output would rather see these numbers without any leading 0s.You can assume that the input file has numbers that have 50 or fewer digits and that the answer is always 50 digits or fewer. Notice, however, that you have to deal with the possibility that an individual number might be 0 or the answer might be 0. There will be no negative integers in the input file.You should solve this problem using arrays that are exactly 50 digits long. Certain bugs can be solved by stretching the array to something like 51 digits, but it shouldnt be necessary to do that and you would lose style points if your arrays require more than 50 digits.The choice of 50 for the number of digits is arbitrary (a magic number), so you should introduce a class constant that you use throughout that would make it easy to modify your code to operate with a different number of digits.

Consider the input file as an example of the kind of problems your program must solve. We might use a more complex input file for actual grading. The Java class libraries include classes called BigInteger and BigDecimal that use a strategy similar to what we are asking you to implement in this program. You are not allowed to solve this problem using BigInteger or BigDecimal. You must solve it using arrays of digits.Your program should be stored in a file called Sum.java.

Input file sum.txt
82384
204 435
22 31 12
999 483
28350 28345 39823 95689 234856 3482 55328 934803
7849323789 22398496 8940 32489 859320
729348690234239 542890432323 534322343298
3948692348692348693486235 5834938349234856234863423
999999999999999999999999 432432 58903 34
82934 49802390432 8554389 4789432789 0 48372934287
0
0 0 0
7482343 0 4879023 0 8943242
3333333333 4723 3333333333 6642 3333333333

Output that should be produced
82384 = 82384
204 + 435 = 639
22 + 31 + 12 = 65
999 + 483 = 1482
28350 + 28345 + 39823 + 95689 + 234856 + 3482 + 55328 + 934803 = 1420676
7849323789 + 22398496 + 8940 + 32489 + 859320 = 7872623034
729348690234239 + 542890432323 + 534322343298 = 730425903009860

[code]....

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Construct And Populate Time Menu

Apr 23, 2014

//construct and populate the Time menu
Menu mnuTime = new Menu("Time", true);
mnuBar.add(mnuTime);
MenuItem mnuCurrentTime = new MenuItem("CurrentTime");
mnuTime.add(mnuCurrentTime);

[Code] ....

E:Calculator.java:64: error: cannot find symbol
if (arg == "Time")
^
symbol: variable arg
location: class Calculator
1 error

Tool completed with exit code 1

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Populate Array From Text File Or Scanner

May 26, 2014

I have a simple txt file, each line simply containing 1 word.I would like each work to represent an index of the array..im having some difficulty populating an array from either a txt file or a scanner.i seem to be able to fill the scanner so to speak with the contents of the text file but not the array. I don't know how to syntax it

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.Arrays;
public class ReadFile
public static void main(String[] args) {

[code]....

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Why Can't Populate Array Of Objects From Inside Constructor

Feb 21, 2015

The experiments will slowly converge towards one big experiment: a simple game. I have just a little interest in games (perhaps I should have more), but making one - even a simple one - should be self rewarding.

However, now to the point.

* The experiment creates an array of rectangle objects.
* The rectangles are painted inside a Frame object at random x,y coords generated by a random number generator
* The rectangles are stationary.
* The rectangles are each assigned their own random colour.
* The array of rectangle objects is created inside the constructor of the class.

The actual code contains various other variables and methods which would distract from a quick analysis, so below is code which has the same logical structure which also fails (instead of array of rectangles, I have used arrays of integers).

import java.util.Random;
/**
* Experiment 14 - see if it works simply - (with integer arrays)
*/
public class TestingArrays {
// instance variables
int N = 10; // the size of the array - 10 elements
int[] a;

[Code]...

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Feb 20, 2015

I have one table in DB i.e. emp. I want to perform all CRUD (insertion,selection,deletion,updation) in DB. Now i want to populate that data in jsp page. Which Collection framework?

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JSP :: Auto Populate A Bean And Retrieve Values From It

Apr 25, 2014

Ok I am trying to auto populate a bean and retrieve the values from it using the jsp:useBean tags ect..

My code looks like this..

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String redirect = request.getParameter("page").trim();
if(redirect.equals("create_account"))
response.sendRedirect("/WebProgrammers/sign_on_server_pages/"+redirect+".jsp");
if(redirect.equals("confirm_info"))

[Code] ....

The error my Apache Tomcat is throwing

org.apache.jasper.JasperException: An exception occurred processing JSP page /sign_on_server_pages/confirm_info.jsp at line 91

88:
89:
90: %>
91: <jsp:useBean id="acct" type="beans.Creating_Account" scope="application"></jsp:useBean>

[Code] ....

I have tried sever different values for the scope attribute and all of them say the same thing about 'not found in scope'.

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Trying To Compare Two JComboBox

Jul 23, 2014

I'm trying to get the input of two jcomboBoxes for example if jcombobox 1 option 1 and jcombox box 2 option 1 is selected result = x

Here is my code:

comboDest1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
//
// Get the source of the component, which is our combo box.
//
JComboBox comboDest1 = (JComboBox) event.getSource();

[Code] ....

How would i achieve this?

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Oct 19, 2014

So why is it that when I attach a KeyAdapter to a JTextField the code in the KeyAdapter will execute, but when I apply that same KeyAdapter to a JComboBox with its edit feature turned on it won't and, more importantly,

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May 15, 2014

How can I read a text file present in my local directory say (C://test.txt) , iterate and populate the values of test.txt into a text area of the JSP page?

Contents in the test.txt file:
username:test
password:test123
domain:test321
DBname:testDB

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JSP :: Populate A Dropdown With Fixed / Static List Of Values?

Nov 3, 2014

I have a fixed list of 20+ values to be populated in a dropdown. The set of values are always going to remain the same, no future scope of modifications, additions or deletions.

Listing each of them as <option> in JSP is making the page look cluttered. Or is it better reading it as a comma-separated string from a properties file and then iterating to populate the dropdown.

What will be the best approach to populate such a dropdown in JSP?

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