JTabbedPane and JTextField

Using JDK 1.4.
I have created an Applet with using a JTabbedPlane with 2 tab components both are JPanels. The first-tab JPanel has a number of JTextComponents on it, the second-tab JPanel ans several JLabels, JButtons, and JTextFields.
When the Applet starts only the components on first-tab are shown - as expected.
I have created a separate class that extends JPanel (add-on-panel) that includes a number of JLabels and JTextFields that are laid out on it. If I add add-on-panel to the second-tab JPanel, add-on-panel's JTextFields show through the first-tab JPanel. Once the second-tab is selected and then the first-tab is selected, add-on-panel's JTextFields no longer show through.
I have explicity setOpaque(true) on first-tab and its components.
Is this a bug or have I messed setting up something correctly???
I have also added a third-tab JPanel that has a JTextEditor and it does not show through.
Thanks in advance

more info here (scroll down to evaluation section)
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5089436

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If you want to listen to changes in the textfield's contents you should use a DocumentListener and not a PropertyChangeListener:
http://java.sun.com/docs/books/tutorial/uiswing/events/documentlistener.html
And please use [co[/i]de] tags when you are posting code (press the code button above the message window).

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Hi at all!!!Sorry for my bad english!!
For a university project I want to implement a copy of notepad. Only I want to manage a more document and I think that it is possible through the JTabbedPane and it works.
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Your main window should have [AddNewTab] and [RemoveTab] buttons.
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package javaapplication5;
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The site looks OK -- actually quite impressive for what appears to be a from-scratch design.
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Hi!
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Peter

Read this section from the Swing tutorial on "Using Layout Managers":
http://java.sun.com/docs/books/tutorial/uiswing/layout/using.html
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import java.awt.GridBagConstraints;
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import java.awt.GridLayout;
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Thank you! It works!
I add some labels & components to your demo program.
Most of the components align vertically.
How to align the "Country", "Test2" & "Extension" labels on the right sides?
How to align their corresponding components so that their left sides all align vertically?
How to make the Cancel button stick to the Save button
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}Edited by: 833768 on 26-Apr-2011 10:32 AM

JTabbedPane and focus problem.

Hello. I currently have a JTabbedPane which contains the various panels that make up different tabs. These tabs are extensions of panels, and are seperate classes imported into the class which contains my JTabbedPane and then added. The frame which conatins my JTabbedPane also has a button, which when pressed I wish it to look at the tab which is currently active, and call a method from the class which this tab refers to. The problem is that I don't know how to get my button to determine which tab is currently active. Any help will be gratefully recieved.

Use getSelectedComponent() or getSelectedIndex() of your JTabbedPane object.

JTabbedPane and one Button for all Tabs

Hello everybody,
im new here an would say HELLOOO to everyone
So ive got an issue.
I am creating in "class A" tabs for a JTabbedPane. In "class B" i create the JTabbedPane and creat instances of class A and add them to the TabbedPane.
in Class B i also create a button, for save actions. When i click the button, a method "save()" will be called and read from every tab the Strings out of textfields.
My problem now is, that it dont work, i call the save method with the instance from the tab, but it dont getText() from the textfield.
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//create an instance tab, parameter is the save file
Tab myTab = new Tab(file);
//other code
(Tab)myTab.save(); //here i eclipse cast to Tab automatically
the save-Method in class A (Tab):
save() {
sysout(texfield1.getText)
BTW how can i highlight code in this forum?

You can add syntax highlighting by going into the advanced editor, that will add a button for it. Unfortunately there are no quick code tags :/
After you find the button post your ACTUAL code. not just some random snippet which looks like your code. What you posted doesn't even compile.

JTabbedPane, and JPanel.

Hi im going thrue swing tutorials here on sun. And wonder a bit about hierarchy. I use JTabbedPane and every class have there own JPanel that i add to the extended JPanel. I show below with example.
In Main class
public JFrame mstFrame() {
        JFrame frame = new JFrame("Main Frame");
        JTabbedPane mstPane = new JTabbedPane();
        mstPane.addTab("Start", new StartPage());
        frame.add(mstPane);
        frame.setVisible(true);
        return frame;
    }In StartPage Class
public class StartPage extends JPanel {
    JPanel createProjectPanel = new JPanel(new GridBagLayout());
     GridBagConstraints c = new GridBagConstraints();
     JScrollPane createCustomerPane = new JScrollPane();
     c.gridy = 1; // second row
     c.gridx = 0; // first cell
     createProjectPanel.add(createCustomerPane ,c);
add(createProjectPanel);Does this destory the hierarchy, or is it okey to do it this way?

It makes sense to have each tab represented by a panel, so I don't reallly understand the question.
public class StartPage extends JPanel
    JPanel createProjectPanel = new JPanel(new GridBagLayout());
    add( createProjectPanel );However, it is unecessary to create a second panel since your class already extends JPanel. Just add the scrollPane directly to the class.
setLayout( new GridBagLayout() ):
JScrollPane createCustomerPane = new JScrollPane();
add(createCustomerPane, c);

Help with JLabels and JTextFields

I'm experimenting with JLabels and JTextFields in a basic JFrame. What I am trying to accomplish (without success) is to align a JLabel above and centered on a JTextField. The tutorials are confusing me. Any help would be greatly appreciated. a Sample of code is ...
JLabel myTextLabel = new JLabel("Who's text Field?");
JTextField myTextField = new JTextField("My Text Field");...after reading the tutorial I thought that I needed to assign L&F variables to the JLabel ... i.e.
JLabel myTextLabel = new JLabel("Who's text field?:", JLabel.CENTER, JLabel.TOP); but this results in an error when compiling. (cannot find symbol), so I thought I need to assign the JLabel to the JTextField. i.e.
myTextLabel.setLabelFor(myTextField);Then I get "identifier" expected. So now being completely confused I am here asking "How do I?" :)
Thanks in advance!

Most likely, you need to think a little more about using a layout manager to hlp you along the way. If memory serves, the default layout manager for a JPanel is FlowLayout and that will simply place the components you add to the panel one after another and allow each to adopt it's preferred size.
One way to ensure that the two compoenets were sized equally, would be to use the GridLayout layout manager and create either one row with two columns, or two rows with one column on each. Then add the compoennets to each of the 'cells' so to speak and that should ensure that they are both the same size.
As to making the text centered in each, both the JLabel and JtextField classes have amethod called setHorizontalAlignment(); it can be used to aligh the text as you require.
Simply create an instance of the class;
JLabel aLabel = new JLabel("Some Text");
// Then set the alignment
aLabel.setHorizontalAlignment(SwingConstants.CENTER);Or, do the whole operation i one step
JLabel aLabel = new JLabel("Sone Text", SwingConstants.CENTER);and then add the componenet to the panel once you have set the layout manager.
Remember that the label.textfield will have to be wide enought to make it obvious that the text is centered!

Sizing issues JButton and JTextField

Hi,
I am new to swing and could use a little guidance on the placement of JButtons and JTextFields on a component. I have tried the setSize method and it doesn't work so I think it has to do with the layout possibly. I need to know how I can resize the testMe button and enlarge the JTextFields. Here is my code.
I would appreciate any other suggestions as well.
Thanks,
Steve
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class TestButton {
    public static void main(String[] arguments) {
        JFrame frame = new Interface();
        frame.show();
class Interface extends JFrame {
     private dataPanel screenvar;
     private JTextArea msgout;
     Interface () {
          super("This is a JFrame");
        setSize(600, 200); // width, height
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JPanel pane = new JPanel();
          // create empty space
          pane.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30)); //top, left, bottom, right
          // declare components
          msgout = new JTextArea( 8, 40 );
          dataPanel screenvar = new dataPanel();
          buttonPanel testMe = new buttonPanel(screenvar, msgout);
          // end declare components
        GridLayout grid = new GridLayout(1, 4, 5, 15); // row, col, hgap, vgap
        pane.setLayout(grid);
          pane.add(testMe);
          pane.add(msgout);
             pane.add( new JScrollPane(msgout));
          pane.add(screenvar);
          msgout.append("Successful");
          setContentPane(pane);
//          pack();
          setVisible(true);
class databaseConnection {
class updateDataFields implements ActionListener {     // 400
     private dataPanel abc;
     private JTextArea msg;
     public updateDataFields(dataPanel xyz, JTextArea msgout) {     // 100
          abc = xyz;
          msg = msgout;
     }     // 100
     public void actionPerformed(ActionEvent evt) {     // 200
          String command = evt.getActionCommand();
               if (command.equals("TestMe")){     // 300
                    msg.append("\nSuccessful");
                    abc.right01.setText("1000");
                    abc.left02.setText("Hi!");
                    abc.right03.setText("123456");
               }     // 300
     }     // 200
}     // 400
class dataPanel extends JPanel {     // Similar to DataPanel in Duke's Bakery
     JLabel left1, left2, left3, right1, right2, right3;
     JTextField left01, left02, left03, right01, right02, right03;
    public dataPanel () {     // 1
          GridLayout grid = new GridLayout(3, 2, 5, 15); // row, col, hgap, vgap
          setLayout(grid);                    // different than panex.setLayout(xgrid);
          left1 = new JLabel("Left1");
          add(left1);
          left01 = new JTextField(0);
          add(left01);
          right1 = new JLabel("Right1");
          add(right1);
          right01 = new JTextField(0);
          add(right01);
          left2 = new JLabel("Left2");
          add(left2);
          left02 = new JTextField(0);
          add(left02);
          right2 = new JLabel("Right2");
          add(right2);
          right02 = new JTextField(0);
          add(right02);
          left3 = new JLabel("Left3");
          add(left3);
          left03 = new JTextField(0);
          add(left03);
          right3 = new JLabel("Right3");
          add(right3);
          right03 = new JTextField(0);
          add(right03);
class buttonPanel extends JPanel {     // 200   Similar to ButtonPanel in Duke's Bakery
     public buttonPanel(dataPanel xyz, JTextArea msgout) {     // 100
          GridLayout actionGrid = new GridLayout(1, 1, 5, 15); // row, col, hgap, vgap
          setLayout(actionGrid);                    // different than panex.setLayout(xgrid);
          JButton buttonTest = new JButton("TestMe");
          buttonTest.setSize(5,5);
          buttonTest.addActionListener( new updateDataFields( xyz, msgout ));
          add(buttonTest);
     }     // 100
}     // 200

Nope, doesn't work. Does the fact that the JButton is part of GridLayout have any affect on this resizing issue?
Thanks for your help, I appreciate it.
Steve

JTabbedPane with JTextField

Can anyone provide me with an example on how to incorporate a JTextField into a JTabbedPane? There are many examples of creating JButtons as components of a JTabbedPanes but nothing for JTextFields. Can this be done? I get some wierd compiler errors when I try it?
Any help will be much appreciated. Thanks.

Thanks for the quick response but...
My question was "how to incorporate these fields into a JTabbedPane."
I'm new to Java so I have "borrowed" a Sun Tutorial JTabbedPane example which includes one JLable component per tab and tried to add a JTextField.
Here is "my" code.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TabbedPaneDemo extends JFrame {
// Initialize Screen Text Fields
private JTextField lastName = null;
//Vector recordData = new Vector(20);
public TabbedPaneDemo() {
ImageIcon icon = new ImageIcon("images/middle.gif");
JTabbedPane tabbedPane = new JTabbedPane();
Component panel1 = makeRecordPanel("Teacher Record");
tabbedPane.addTab("Teacher", icon, panel1, "Update Teacher Information");
tabbedPane.setSelectedIndex(0);
Component panel2 = makeRecordPanel("Parent Record");
tabbedPane.addTab("Parent", icon, panel2, "Update Parent Information");
Component panel3 = makeRecordPanel("Child Record");
tabbedPane.addTab("Child", icon, panel3, "Update Child Information");
//Add the tabbed pane to this panel.
setLayout(new GridLayout(1, 1));
add(tabbedPane);
protected Component makeRecordPanel(String text) {
JPanel panel = new JPanel(false);
JLabel label1 = new JLabel("Last Name");
JTextField lastName = new JTextField(20);
label1.setHorizontalAlignment(JLabel.LEFT);
panel.setLayout(new GridLayout(1, 1));
panel.add(label1);
panel.add(lastName);
return panel;
public static void main(String[] args) {
JFrame frame = new JFrame("Maintain DayCare Records");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
frame.getContentPane().add(new TabbedPaneDemo(),
BorderLayout.CENTER);
frame.setSize(800, 600);
frame.setVisible(true);
This compiles OK but when I try to run it I get the following run-time errors.
java.lang.Error: Do not use TabbedPaneDemo.setLayout() use TabbedPaneDemo.getContentPane().setLayout() instead
     at javax.swing.JFrame.createRootPaneException(JFrame.java:333)
     at javax.swing.JFrame.setLayout(JFrame.java:394)
     at TabbedPaneDemo.<init>(TabbedPaneDemo.java:29)
     at TabbedPaneDemo.main(TabbedPaneDemo.java:53)
Any thoughts?

JTabbedPane and Serialization

Hi, I want to Serialize a JTabbedPane to a file but I am experiencing lots of problems :
Firstly, I get an exception :
java.io.NotSerializableException: javax.swing.plaf.basic.BasicTabbedPaneUI$MouseHandler
I can override this in out custom plaf, but then this throws out pluggable look and feel. Is there any other way I can fix this ....
Also I have had to change lots of code to get these to Serialize e.g cutomizing the BasicTabbedPaneUI and other classes to implement Serializable, and I get a bizarre problem where I write my Swing JxInternalFrame to disk, and then when I goto dispose of it, it throws a completely different Exception in firePropertyChanged within JTabbedPane.
It tries to cast a JTabbedPane within the class BasicTabbedPaneUI$PropertyChangeHandler and the source is a Viewport... If I remove the Serialize to Disk code, then this does not occur!
I am a little baffled why this happens ... can anyone help?

My objective is to Serialize out the JxInternalFrame with all it's components to disk.
We have an Application that Dynamically creates GUI interfaces using XML. Instead of creating the JxInternalFrame and all its components from the XML String, I thought it would be quicker to Serialize the Object to disk and re-read once the Frame once it had initialliy been built, for caching purposes.
It takes about 4 seconds to build a 6MB JxInternalFrame with all its components (JTabbedPanes, JTextFields, JCombos etc....), and I want to minimise this to be almost instant ... i.e as if using JInternalFrame.setVisible( true or false ).
I have not looked at XMLEncoder/Decoder yet, I will have a look and see if this will help or if this is fast enough.
Bare in mind I could be opening a Screen many times, but do not want to initiate it again from raw XML AND I do not want to store Huge objects in memory.

JTabbedPane and JTextField

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