Problems sizing multiple JPanels.

I'm writing a survey program that needs to be formatted to a certain size. I'm using calls to panel.setsize( ) to set the size to 800 x 600.
I have nine JPanels as globals, all of which are created and "packed" initially. These JPanels are supposed to display in a global JFrame, one at a time. After each "next button" click I call frame.remove(panel) to remove the current panel and frame.add(panel) to add the next. Then I call pack again.
Everything works fine until looping from the final panel to the first. Upon doing so all of the elements in the JPanel disappear, (although hovering over the invisible elements makes them reappear.)
Is there anything I'm doing wrong?

Well, calling repaint after pack seemed to solve the problem.
Does anyone care to provide insight as to why?
Thanks.

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Simple FocusTraversalPolicy (multiple JPanels)

I've seen quite a few posts on this topic, so I thought I'd share my own simple solution. It solves the problem of the tab order when you have multiple JPanels and want to enforce a specific tab order.
class MyFocusTraversalPolicy extends FocusTraversalPolicy {
    Vector components;
    public MyFocusTraversalPolicy(Vector components) {
        this.components = components;
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        int ix = components.indexOf(comp) + 1;
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        else
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        int ix = components.indexOf(comp) - 1;
        Component c;
        if(ix < 0)
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        else
            c = (Component)components.get(ix);
        return c.isEnabled() ? c : getComponentBefore(root, c);
    public Component getDefaultComponent(Container root) {
        return (Component)components.get(0);
    public Component getFirstComponent(Container root) {
        return (Component)components.get(0);
    public Component getLastComponent(Container root) {
        return (Component)components.get(components.size() - 1);
}Create the Swing components as usual, add the components to a vector, in the order you want them to be tabbed:
Vector comps = new Vector();
comps.add(textField1);
comps.add(comoboBox1);
comps.add(((JSpinner.DefaultEditor)spinner1.getEditor()).getTextField());
MyFocusTraversalPolicy policy = new MyFocusTraversalPolicy(comps);
setFocusTraversalPolicy(policy);Note how the JSpinner component is added. This works fine with tabbing forwards and backwards; skips disabled components as expected.

Hi AikoMuto,
I want to traverse focus among some components(not all the components)
lie in multiple panels which are in different classes. Following is my
class structure.
Class Test extends JPanel{
PanelA panelA;
PanelB panelB;
PanelC panelC;
public void jbInit()
Vector comps = new Vector();
comps.add(panelA.fieldA);
comps.add(panelB.fieldB);
for(int i=0;i<panelC.buttons.length;i++){
comps.add(panelC.buttons);
MyFocusTraversalPolicy policy = new MyFocusTraversalPolicy(comps);
setFocusTraversalPolicy(policy);
Class PanelA extends JPanel{
JTextField fieldA;
JScrollbar scrollA;
Class PanelB extends JPanel{
JTextField fieldB;
JScrollbar scrollB;
Class PanelC extends JPanel{
JButton[] buttons;
I want to traverse focus among fieldA -> fieldB -> buttons[0]
-> buttons[1] -> ................ -> buttons[buttons.length -1].
I used your code and checked whether it's working for my example. Setting traversal policy is done in parent panel i.e. in Test class. But
unfortunately it doesn't capture both Tab and Tab+Shift keys. I
debugged the code and found that it doesn't call either of
getComponentAfter() or getComponentBefore() methods for above key
events.
I guess your code is not working as the panels are in different classes.
Could you please help me to get this done?
Thanks & Regards

Problem with multiple Toplink/JPA apps in same server

Anyone have experence of running serveral Toplink/ EJB-3 Web apps in the same server (OC4J, alas)?
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Yes, they access the same datasource and most of the tables overlap.
We're thinking it might help to have common entity classes and put them in a shared library, but I don't know if this is relevant (setting up shared libraries complicates testing and tends to snowball, I reckon we need about 15 jars all told).
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How do I add multiple JPanels to a JFrame?

I've been trying to do my own little side project to just make something for me and my friends. However, I can't get multiple JPanels to display in one JFrame. If I add more than one JPanel, nothing shows up in the frame. I've tried with SpringLayout, FlowLayout, GridBagLayout, and whatever the default layout for JFrames is. Here is the code that's important:
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.*;
public class CharSheetMain {
      * @param args
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          abilityScore de=new abilityScore();
          abilityScore co=new abilityScore();
          abilityScore in=new abilityScore();
          abilityScore wi=new abilityScore();
          abilityScore ch=new abilityScore();
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}aPanel and dPanel both extend JPanel. frame extends JFrame. I can get either aPanel or dPanel to show up, but not both at the same time. Can someone tell me what I'm doing wrong?

In the future, Swing related questions should be posted in the Swing forum.
You need to read up on [How to Use Layout Managers|http://download.oracle.com/javase/tutorial/uiswing/layout/index.html]. The tutorial has working example of how to use each layout manager.
By default the content pane of the frame uses a BorderLayout.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org], that demonstrates the incorrect behaviour.
The code you posted in NOT a SSCCE, since we don't have access to any of your custom classes. To do simple tests of adding a panel to frame then just create a panel, give it a preferred size and give each panel a different background color so you can see how it works with your choosen layout manager.

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I have two jLists. Now I have to select some items from one jlist and have to transfer in the other one. But while trying to do it in the runtime I am getting some unexpected runtime errors including "Exception occurred during event dispatching". When I try to transfer only one item it works fine but shows problem in multiple selections. Pleast give your suggestions.

[_First suggestion_|http://catb.org/~esr/faqs/smart-questions.html]
[_Second suggestion_|http://mindprod.com/jgloss/sscce.html]
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I'm having a problem using multiple WITH statements. Oracle seems to be expecting a SELECT statement after the first one. I need two in order to reference stuff from the second one in another query.
Here's my code:
<code>
WITH calculate_terms AS (SELECT robinst_current_term_code,
CASE
WHEN robinst_current_term_code LIKE '%60' THEN robinst_current_term_code - '40'
WHEN robinst_current_term_code LIKE '%20' THEN robinst_current_term_code - '100'
END first_term,
CASE
WHEN robinst_current_term_code LIKE '%60' THEN robinst_current_term_code - '100'
WHEN robinst_current_term_code LIKE '%20' THEN robinst_current_term_code - '160'
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FROM robinst
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SELECT
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WHEN first_term LIKE '%20' THEN 'Spring '||substr(first_term,0,4)
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<code>
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You can just separate them with a comma:
WITH calculate_terms AS (SELECT robinst_current_term_code,
CASE
WHEN robinst_current_term_code LIKE '%60' THEN robinst_current_term_code - '40'
WHEN robinst_current_term_code LIKE '%20' THEN robinst_current_term_code - '100'
END first_term,
CASE
WHEN robinst_current_term_code LIKE '%60' THEN robinst_current_term_code - '100'
WHEN robinst_current_term_code LIKE '%20' THEN robinst_current_term_code - '160'
END second_term
FROM robinst
WHERE robinst_aidy_code = :aidy),
/*Use terms from calculate_terms to generate attendance periods*/
gen_attn_terms AS
SELECT
CASE
WHEN first_term LIKE '%60' THEN 'Fall '||substr(first_term,0,4)
WHEN first_term LIKE '%20' THEN 'Spring '||substr(first_term,0,4)
END first_attn_period,
CASE
WHEN second_term LIKE '%60' THEN 'Fall '||substr(second_term,0,4)
WHEN second_term LIKE '%20' THEN 'Spring '||substr(second_term,0,4)
END second_attn_period
FROM calculate_terms
)Not tested because there are no scripts.

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Problem deleting multiple keywords in lightroom 5

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HI,
Thanks in Advance for your suggestions.. Highly appreciated.
We have problems with multiple IDocs in one file.
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Thanks for the swift response. Always ideas are useful.
As of now , Middleware cannot split the file.
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Hi Noel:
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Resolution problem when printing JPanel with picture on bg

Hellow!
I have some problems with printing JPanel component. I have a picture drawn on the background of the JPanel and several buttons on it. The whole JPanel is about 1600x800px. When i print whole the component with the help of PDF virtual printer, component is printed larger than A4 list. It is strange for me because print resolution is 600 dpi, so whole component must be a rectangle with the size about 2.5x1.5 inches. When I scale the graphics before painting component to fit image to page (i mean ... {color:#ff0000}g2d.scale(sc,sc); panel.paintAll(g2d);{color} ...), the picture's quality becomes very bad.
I understod it so: I draw the component on the paper in screen resolution, then I decrease image size, so quality also decreases.
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Hi there,
Could you provide the community with a little more information to help narrow troubleshooting? What operating system?
You can say thanks by clicking the Kudos Star in my post. If my post resolves your problem, please mark it as Accepted Solution so others can benefit too.

Problems sizing multiple JPanels.

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