Swing/AWT/SWT :: JComboBox Crashes Application
Sep 15, 2014
I lately started using "advanced" Swing-Components, like JTabbedPane and JComboBox, but I dont get the ComboBox working/This is the code I use:
public class PreferencesPanel extends JPanel
{
public PreferencesPanel (MapEditWindow window)
{
super ();
setLayout (new FlowLayout ());
String[] resolutions =
{
"1024x768", "1280x800"
[code]...
The TabbedPane is placed in another JPanel, which is placed in an Fullscreen-Window.
Now, the problem is, that when I start the application and open the "Preferences"-Tab, everything seems normal, I can see the ComboBox and the first entry is selected. But when I click it, instead of opening and offering me more choices, the program crashes and my screen turns black (I'm using OS X, on Windows it would possibly turn white, but I didnt test this out).
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Sep 7, 2014
I am developing an application using Java Swing on Netbeans using Java DB, In which i want to create a form using Jtextfields & JComboBox.
I already added data in the JcomboBox to select. I already create a database and table for this application. Now i want to insert the data in Jtextfield and selection of Jcombobox to insert into the table i designed for it. How to link the form with the table and insert the data of form in table...
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Jun 6, 2014
So I've been working on a music player in android studio and I've created two java classes. One for Main Start Screen(StartScreen.Java) and one for the main player (player.Java). I have an onClicl event associated with a button as shown below.
public void onclick(View view) {
Intent detailIntent = new Intent(this, main_player.class);
startActivity(detailIntent);
}
The code for the second Java Class is as below. There is nothing in the java class as for now.
package com.example.musicplayer.app;
import android.app.Activity;
import android.os.Bundle;
public class main_player extends Activity {
protected void onCreate(Bundle savedInstanceState) {
[Code] .....
Where is the actual mistake because the app works fine until i click the button that is suppose to take me to the main player screen?
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Mar 24, 2015
I am trying to set some serial port parameters here:
public synchronized void connect(String port, String rate, String data, String stop, String parity) throws Exception {
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(port);
if (portIdentifier.isCurrentlyOwned()) {
System.out.println("Error: Port is currently in use");
} else {
CommPort commPort = portIdentifier.open(this.getClass().getName(),
2000);
[Code].....
To set the serial port parameters i need to use Integers instead of strings.
So, how i turn my string EG:
String[] baudRates = { "2400", "4800", "9600", "14400", "19200", "38400", "56000", "115200" };
into Integers for my combo box
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Apr 14, 2014
My database contains path of images that I want my jComboBox to diaplay. I have written the following code but it does not work for comboBox but works fine when I display image on jLabel etc. How should I go about this
try {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ex) {
Logger.getLogger(updatedetail.class.getName()).log(Level.SEVERE, null, ex);
[Code] ....
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Mar 9, 2014
I have posted a class ReadExcelDemo and I have this working correctly and can println and get my desired outcome. Where I am having issues is with taking that data and filling a JComboBox drop down menu which is the last line of code where I am getting the error Array Dimension missing.
package Product.form;
import java.io.File;
import java.io.FileInputStream;
import java.util.TreeSet;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
[Code] ....
This is located in the GUI class.
selectProduct.setModel((new ReadExcelDemo.Castings[]).toString());
// This is another class where I am trying to fill a Jcombobox
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Jun 10, 2014
implementing a swings application. I have a JFrame containing 2 JPanels : Top & Bottom panel. Top panel has a Jcombobox, Botton panel contain a Graph plot. On changing value in combo box, graph plot should get updated. I thought of adding actionlistener to Jcombobox. Not sure what to implement in its actionPerformed()
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Aug 7, 2014
I am trying to use a JComboBox with a simple ListCellRenderer
public class EntscheidendeBehoerdeListRenderer extends JLabel implements ListCellRenderer<EntscheidendeBehoerde> {
private static final Color HIGHLIGHT_COLOR = new Color(0, 0, 128);
private static final long serialVersionUID = -4719965772580952993L;
public Component getListCellRendererComponent(
JList<? extends EntscheidendeBehoerde> list,
EntscheidendeBehoerde value, int index, boolean isSelected,
boolean cellHasFocus) {
[code].....
The JCombox shows and odd behavior, when I point to an item it moves up or down and an empty line appears under the cursor.
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Jul 14, 2014
I have three JComboBoxes. When the user selects an entry in the first JComboBox the entries in the second are set. For this I use an Action extends AbstractAction which is bound to the first JComboBox.
I have also bound an Action to the second JComboBox.
Problem: this also fires when the entries on the second JCombox are added which leads to a Nullpointer.
I need a Listener which only reacts to user input, and does not react when the model of the JComboBox is changed.
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Jul 16, 2014
How can I add values from a JComboBox to a JTable ? I've created a drop down list and a button and I want the values to be added to a table whenever i click on the button (add).
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Feb 19, 2014
in the SSCCE, the ItemListener is not triggered when I add a FocusListener for it beforehand.How can I make them both function when either focus is lost or when an item is selected?
package testapp;
import java.awt.Dimension;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.sql.SQLException;
import javax.swing.JButton;
[code]....
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Apr 17, 2014
I am developing a java based software connected with a mysql database. I have an Item table in my database. I created a bean class which can keep all item data with it and. Then I loaded each Item data in to its object and fill a Jcombobox. Now I want to search with Item name and get all Item data when selecting that item. I have overidden the toString method to Item name in that class. Is there any way to search my Item objects inside a jcombobox?
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Sep 23, 2014
I have two classes - One is Read.java and the other is Display.java
Read.java looks like this
public static void main(String[]args){
File file = new File("test.txt");
try{
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
[Code] ....
Display.java looks like this:
public class Display extends JFrame {
private JComboBox comboBox;
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
//method call to access other class
[Code] ....
Instead of having it so it displays the id's to the console,is there a way I can set it straight up to the combo box?
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Nov 11, 2014
I need to take the value of what's typed in my JTextField, and once the submit button is clicked, I want to add that string to my JComboBox list items.
Depending which RadioButton they selected, I need to put the team in HOME or AWAY teams, and so on and so on, until they continue clicking submit.
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Jan 29, 2015
My question is related to combo boxes. A combo box in general is a text field with a dropdown list. I would want to know if we can replace hthe dropdown List by an other component, for example a JTable component.
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Jan 8, 2015
The following error occurs when calling the JNI library . Also i attached the log file .
#
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (0xb), pid=855638038, tid=4
#
# Java VM: Java HotSpot(TM) Server VM (1.6.0.00 svcnedccadmin:01.23.09-18:04 IA6
4 mixed mode)
# Problematic frame:
# C 7e1809e0
#
Abort(coredump)
*** Error code 9
Stop.
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Sep 11, 2014
I need to implement an editable JComboBox. It should display a list of rivers from a database. However since the number of rivers is very large, the entries must be dynamically filled after the user has typed in three or more letters.
I have tried to solve this using a KeyAdapter. Everythings works. However after the user has typed in three characters, these three characters are selected in the Combobox. Of course when the user continues to type these chars will be replaced. I have so far not found a solution to deselect the characters and place the cursor at the end.
this.fliessgewaesserComboBox = new JComboBox<UisFliessgewaesser>();
this.fliessgewaesserComboBox.setEditable(true);
this.add(this.fliessgewaesserComboBox, c);
FliessgewaesserSuchenKeyAdapter fliessgewaesserSuchenKeyAdapter = new FliessgewaesserSuchenKeyAdapter(this);
this.fliessgewaesserComboBox.getEditor().getEditorComponent().addKeyListener(fliessgewaesserSuchenKeyAdapter);
[Code] .....
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Aug 6, 2014
i've spend an hour or two, pasting fragments from tutorials and nothing changed.
Well - i have GUI, that have JComboBox with two elements:
String[] fedoras = { "Fedora 19", "Fedora 20" };
JComboBox fedora_list = new JComboBox(fedoras);
fedora_list.setSelectedIndex(0);
fedora_list.setBounds(120,170, 170,25);
fedora_list.addActionListener(this);
this.add(fedora_list);
Below i have normal button (named Update) with "update" set as ActionCommand. This button after clicked should check which value from list is selected and perform different operations for that elements. But it's harder than i thought.
Code for update button:
public void actionPerformed(ActionEvent e){
String cmd = e.getActionCommand();
(...)
else if ("update".equals(cmd)){
String selectedFedora = (String) fedora_list.getSelectedItem();
if (selectedFedora.equals("Fedora 19")) {
[code]....
- after user clicked Update button, button should check which value is selected in JComboBox (fedora_list).
- if Fedora 19 is selected and button clicked, then action in Xterm
- if Fedora 20 is selected, this same action in Xterm is performed, but for Fedora Linux 20
The problem is - i don't know hot to code Update button to check which value from fedora_list (JComboBox) is selected and perform other actions for every element on List.
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Sep 30, 2014
I do now have the problem where i have to insert the numbers 1 to 100 individually in order to allow the program to accept a grade as high as 100%.
Also as soon as i type in a negative number the system crashes and shows me a error as attached.
/*
Averaging grades
To use the Java Swing interface to calculate the average of up to 50 grades.Average is calculated once -1 is entered as a value. The grades are then sorted from lowest to highest and displayed in a content pane which also displays the average.
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing .*;
import javax.swing.text.*;
public class Averages extends JFrame {
//construct components
JLabel sortPrompt = new JLabel("Sort By:");
[Code] ....
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Nov 5, 2014
How do I move focus from a jcombobox to a specific component say a jtextarea.
My attempt below seems to be moving to a random component not the desired jtextarea.
takenByCombo.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_TAB ) {
e.consume();
dayJTArea.requestFocus(); // focust not moving dayJTArea
}
}
});
I applied the above logic to move focus from a specific jtextarea to another jtextarea as seen below and it works as desired.
dayJTArea.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_TAB ) {
e.consume();
monthJTArea.requestFocus();
}
}
});
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Mar 19, 2014
I would like to be able to change the locale in my Swing application at runtime and have all the text elements on the GUI update themselves with localized text from a ResourceBundle of the new locale.If there a simple way of achieving this without having to create an event model for all GUI pages?
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Sep 13, 2014
What is the best way to run a Swing application on the web? Should I convert it to an applet or do something else?
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Apr 6, 2014
I am writing a Java Swing GUI application on my pc. I have to give this application to my cousin with another pc, where he is not aware of programming. then how can he execute that application? are there any ways of skipping the "javac" and "java" procedures while executing the app on his computer?
I am using win7 x86 and same at my cousin's place. I am also using eclipse-kepler sr1 ide for app development.
Are there any easy ways of automating this "javac" and "java" process(compilation and execution)? something like...scripting?
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May 18, 2014
I made a check4 application with Java.It correctly works but sometimes the application just stop itself during the execution.I never had a problem like this. The application just stop itself and i can't even quit using the closing button..
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Apr 16, 2014
I need to put a Web Page in my JFrame application , I got a lot codes on the internet and could implement without problems , but the problem is that this code has an ugly page as hell, with colored all wrong and with a very poor quality , one of code I used was this :
* import javax.swing . ;
{ public class SwingWebPage
public static void main ( String args [ ] ) throws Exception {
JEditorPane website = new JEditorPane ( " http://www.google.com/ " ) ;
website.setEditable ( false) ;
[code]...
If you test , you'll see that the page is displayed in the JFrame is horrible.
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Jul 28, 2014
I'm developing a java swing application in which i need to show the map of some area and allow user to put markers on it. I've goggled a lot on the topic but unfortunately i haven't got any how i can do it.
I came across some ideas like displaying a web browser in swing just like JXBrowser (i can't afford JXBrowser). And I'm also not sure if this way will allow me adding markers.
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