I'm relatively new to Java Swing in general and decided to use Intellij's GUI Designer. For those not familiar with it, Intellij creates 2 files for each GUI "screen". One is the "design" in the form of a .form file where you drag and drop UI components, and one is the "controller".
Anyway, I'm doing a 5-step questionnaire implemented on Java Swing. The first part asks the user what is their favourite fruit, and when a choice button is clicked, the choice is saved and the next JFrame appears with the next question and so on. JFrame1 transitioning to JFrame2 worked fine, and all UI components were shown. However, when I tried to transition from JFrame2 to JFrame3, JFrame3 showed up blank instead.
I've tried to call .pack() before setVisible(true), and then calling .toFront() after that, but that didn't help.
Below shows a section of my code. JFrame1, 2, and 3 all use the same exact code in its constructors and calling of the next JFrame. JFrame1 only differs by a single line which will be stated later in the code.
JFrame1.java
public class Frame1 extends JFrame {
private JPanel mainPanel;
private JLabel narrationLabel;
private JButton option1_btn;
private JButton option2_btn;
private JButton option3_btn;
public Frame1()
{
setTitle("Questionnaire");
setSize(1000, 1000);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Frame2 nextScreen = new Frame2 (); //declare the next screen to show
add(mainPanel); //this is only for the first starting JFrame
//JFrame2 and JFrame3 do not have this
//repeat this for buttons option2_btn and option3_btn
option1_btn.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
//swap screens to the next main filler selection screen
mainPanel.setVisible(false);
nextScreen.pack();
add(nextScreen.getPanel());
nextScreen.getPanel().setVisible(true);
}
});
}
public JPanel getPanel()
{
return mainPanel;
}
}
Main.java
public class Main
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame1 frame1 = new JFrame1(); //create start screen GUI
frame1.setVisible(true); //display GUI
}
});
}
}
My hunch tells me it might a concurrency issue, but I'm not sure if I am right, or where is the issue and how to resolve it. If a .form file is needed, I would gladly upload the code for it. Any help appreciated.
Related
i'm at a standstill developing a java application.
I have a series of JFrames that open each other, and once I open the next, the frame before shall close.
Now, all works fine, I used
setVisible(false);
to "close" the frame, but I have some problems with a specific form I generated:
The form has some panels inside, and the panels each have a button which opens the next form. Now, I wonder how can I apply setVisible(false) to the form that contains those panels.
ChooseForm is the name of the form that contains the panels;
And I have this event handling the button click of each panel's button
private void btn_scegliMouseClicked(java.awt.event.MouseEvent evt) {
Database.getAbitazioneByCodice(label_codice.getText());
MainForm.showFrame();
}
Thanks in advance for the help.
There are many ways to do this.
A Simple way you can do like this:
class YourFrame extends JFrame implements ActionListener {
private YourPanel panel;
public YourFrame() {
//...
panel.addButtonActionListener(this);
}
public void actionPerformed(ActionEvent e) {
//show other Frame and hide this Frame
}
}
class YourPanel extends JPanel {
private JButton yourButton;
public void addButtonActionListener(ActionListener listener) {
yourButton.addActionListener(listener);
}
}
I have two Jframes where frame1 has some text fields and when a button on frame1 is clicked, I open another JFrame which contains a search box and a JTable containing search results.
When I click on a result row on JTable, I want that particular values to be reflected in the frame1 text fields.
I tried passing the JFrame1's object as a parameter but I have no clear idea on how to achieve this.
Any help would be highly appreciated.
Thanks
First of all, your program design seems a bit off, as if you are using a JFrame for one of your windows where you should in fact be using a JDialog since it sounds as if one window should be dependent upon the other.
But regardless, you pass references of GUI objects the same as you would standard non-GUI Java code. If one window opens the other (the second often being the dialog), then the first window usually already holds a reference to the second window and can call methods off of it. The key often is when to have the first window call the second's methods to get its state. If the second is a modal dialog, then the when is easy -- immediately after the dialog returns which will be in the code immediately after you set the second dialog visible. If it is not a modal dialog, then you probably want to use a listener of some sort to know when to extract the information.
Having said this, the details will all depend on your program structure, and you'll need to tell us more about this if you want more specific help.
For a simple example that has one window open another, allows the user to enter text into the dialog windows JTextField, and then places the text in the first window's JTextField, please have a look at this:
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class WindowCommunication {
private static void createAndShowUI() {
JFrame frame = new JFrame("WindowCommunication");
frame.getContentPane().add(new MyFramePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
// let's be sure to start Swing on the Swing event thread
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
class MyFramePanel extends JPanel {
private JTextField field = new JTextField(10);
private JButton openDialogeBtn = new JButton("Open Dialog");
// here my main gui has a reference to the JDialog and to the
// MyDialogPanel which is displayed in the JDialog
private MyDialogPanel dialogPanel = new MyDialogPanel();
private JDialog dialog;
public MyFramePanel() {
openDialogeBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
openTableAction();
}
});
field.setEditable(false);
field.setFocusable(false);
add(field);
add(openDialogeBtn);
}
private void openTableAction() {
// lazy creation of the JDialog
if (dialog == null) {
Window win = SwingUtilities.getWindowAncestor(this);
if (win != null) {
dialog = new JDialog(win, "My Dialog",
ModalityType.APPLICATION_MODAL);
dialog.getContentPane().add(dialogPanel);
dialog.pack();
dialog.setLocationRelativeTo(null);
}
}
dialog.setVisible(true); // here the modal dialog takes over
// this line starts *after* the modal dialog has been disposed
// **** here's the key where I get the String from JTextField in the GUI held
// by the JDialog and put it into this GUI's JTextField.
field.setText(dialogPanel.getFieldText());
}
}
class MyDialogPanel extends JPanel {
private JTextField field = new JTextField(10);
private JButton okButton = new JButton("OK");
public MyDialogPanel() {
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
okButtonAction();
}
});
add(field);
add(okButton);
}
// to allow outside classes to get the text held by the JTextField
public String getFieldText() {
return field.getText();
}
// This button's action is simply to dispose of the JDialog.
private void okButtonAction() {
// win is here the JDialog that holds this JPanel, but it could be a JFrame or
// any other top-level container that is holding this JPanel
Window win = SwingUtilities.getWindowAncestor(this);
if (win != null) {
win.dispose();
}
}
}
You'd do a very similar technique to get information out of a JTable.
And again, if this information doesn't help you, then please tell us more about your program including showing us some of your code. The best code to show is a small compilable example, an SSCCE similar to what I've posted above.
I have two Jframes where frame1 has some text fields and when a button on frame1 is clicked, I open another JFrame which contains a search box and a JTable containing search results.
When I click on a result row on JTable, I want that particular values to be reflected in the frame1 text fields.
I tried passing the JFrame1's object as a parameter but I have no clear idea on how to achieve this.
Any help would be highly appreciated.
Thanks
First of all, your program design seems a bit off, as if you are using a JFrame for one of your windows where you should in fact be using a JDialog since it sounds as if one window should be dependent upon the other.
But regardless, you pass references of GUI objects the same as you would standard non-GUI Java code. If one window opens the other (the second often being the dialog), then the first window usually already holds a reference to the second window and can call methods off of it. The key often is when to have the first window call the second's methods to get its state. If the second is a modal dialog, then the when is easy -- immediately after the dialog returns which will be in the code immediately after you set the second dialog visible. If it is not a modal dialog, then you probably want to use a listener of some sort to know when to extract the information.
Having said this, the details will all depend on your program structure, and you'll need to tell us more about this if you want more specific help.
For a simple example that has one window open another, allows the user to enter text into the dialog windows JTextField, and then places the text in the first window's JTextField, please have a look at this:
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class WindowCommunication {
private static void createAndShowUI() {
JFrame frame = new JFrame("WindowCommunication");
frame.getContentPane().add(new MyFramePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
// let's be sure to start Swing on the Swing event thread
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
class MyFramePanel extends JPanel {
private JTextField field = new JTextField(10);
private JButton openDialogeBtn = new JButton("Open Dialog");
// here my main gui has a reference to the JDialog and to the
// MyDialogPanel which is displayed in the JDialog
private MyDialogPanel dialogPanel = new MyDialogPanel();
private JDialog dialog;
public MyFramePanel() {
openDialogeBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
openTableAction();
}
});
field.setEditable(false);
field.setFocusable(false);
add(field);
add(openDialogeBtn);
}
private void openTableAction() {
// lazy creation of the JDialog
if (dialog == null) {
Window win = SwingUtilities.getWindowAncestor(this);
if (win != null) {
dialog = new JDialog(win, "My Dialog",
ModalityType.APPLICATION_MODAL);
dialog.getContentPane().add(dialogPanel);
dialog.pack();
dialog.setLocationRelativeTo(null);
}
}
dialog.setVisible(true); // here the modal dialog takes over
// this line starts *after* the modal dialog has been disposed
// **** here's the key where I get the String from JTextField in the GUI held
// by the JDialog and put it into this GUI's JTextField.
field.setText(dialogPanel.getFieldText());
}
}
class MyDialogPanel extends JPanel {
private JTextField field = new JTextField(10);
private JButton okButton = new JButton("OK");
public MyDialogPanel() {
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
okButtonAction();
}
});
add(field);
add(okButton);
}
// to allow outside classes to get the text held by the JTextField
public String getFieldText() {
return field.getText();
}
// This button's action is simply to dispose of the JDialog.
private void okButtonAction() {
// win is here the JDialog that holds this JPanel, but it could be a JFrame or
// any other top-level container that is holding this JPanel
Window win = SwingUtilities.getWindowAncestor(this);
if (win != null) {
win.dispose();
}
}
}
You'd do a very similar technique to get information out of a JTable.
And again, if this information doesn't help you, then please tell us more about your program including showing us some of your code. The best code to show is a small compilable example, an SSCCE similar to what I've posted above.
I am very new to Java Swing and I am working on a login frame with swing that works like this.
After I login successfully in a frame, another new frame is opened while the login frame goes to invisible.
What I am trying to do is that when i close the another frame (after login frame) I want the previous login frame to show again from invisible to visible. please let me know how to do this..:)
Suppose your previous frame is myPreviousFrame
just write myPreviousFrame.setVisible(true); when you want to make visible.
Example:
currentFrame.dispose();
myPreviousFrame.setVisible(true);
Note: if you write code System.exit(0) it will close (terminate) your application. When your application goes terminate you can not make login frame as visible. You need to restart your application. So you need to write dispose().
UPDATED:
I suppose you have a method exitForm() which invokes when you click the Close (X).
Example:
private void exitForm(java.awt.event.WindowEvent evt) {
//System.exit(0); which was used
// to fullfill your requirement you need to write below code
this.dispose();// here [this] keyword means your current frame
//OR simply you can use this.setVisible(false); instead of this.dispose();
myPreviousFrame.setVisible(true); // this will displays your login frame
}
u may try like this:
public class jFrame1 extends javax.swing.JFrame{
// ur code
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jFrame2 f2 = new jFrame2(this);
f2.setVisible(true);
this.setVisible(false);
}
}
public class jFrame2 extends javax.swing.JFrame{
// ur code
private JFrame frame;
public jFrame2(JFrame frame) {
this.frame = frame;
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.frame.setVisible(true);
this.setVisible(false);
this.dispose();
}
// so on
}
Here i am just considering two frames and at present you are at second frame and wanna go back to first frame.
public class previous_action implements ActionListener{
public void actionPerformed(ActionEvent t){
Movieticket m;
m=new Movieticket();
m.display();
}
}
Here previous action is a class which will take you back to previous frame.Button frame is a class which sets frame where we are at present.Movie ticket is a public class containing display function which sets frame when the application started that is the first frame.
when the button is clicked it will take you to previous frame.
I'm trying to set the text in a label dynamically by calling the setText method whenever a button is clicked. Here is my code:
import java.awt.*;
import java.awt.event.*;
class Date {
public static void main(String[] args) {
new MainWindow();
}
}
class MainWindow {
static Label month = new Label();
static Label day = new Label();
static Button submit = new Button("Submit");
MainWindow() {
Frame myFrame = new Frame("Date Window");
myFrame.setLayout(new FlowLayout());
myFrame.add(month);
myFrame.add(day);
myFrame.add(submit);
submit.addActionListener(new ButtonListener());
myFrame.addWindowListener(new WindowListener());
myFrame.setSize(200, 200);
myFrame.setVisible(true);
}
}
class WindowListener extends WindowAdapter {
#Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
if (event.getSource() == MainWindow.submit) {
MainWindow.month.setText("12");
MainWindow.day.setText("31");
}
}
}
When I initialize the two Label objects without any arguments, the strings "12" and "31" that are passed to the setText method aren't visible on the screen when the submit button is clicked until I click on the window and drag to resize it. I've noticed this on a Mac only. On a PC, the strings are are visible but obscured until I resize the window. However, if I initialize the labels like this:
static Label month = new Label("0");
static Label day = new Label("0");
On the Mac, the strings appear as intended, however, they're obscured until the window is resized. What am I missing?
Calling validate() on the Frame as mentioned here solved the problem.
Try repainting the frame or/and set enough space(setPreferredSize, setMininumSize)
Well, most of your posting are over a year old so I'll give you the benefit of the doubt. I never use AWT so I don't know what the problem is, but I'll suggest:
1) Name you classes properly. "Date" is already a class in the JDK. Choose a better name.
2) Try using Swing components instead of AWT.
3) Get rid of static variables from your class.
4) Get rid of the WindowListener to close the frame.
The code example you posted here is 10-15 years old. Try something newer. Start with the Swing tutorial for more recent examples.