About a JTree of mixed String and JLabel leafs

Dear Java and Swing freaks,
Why do I get the text code instead of the expected JLabel in the leaves of my JTree ?
I want to construct a Jtree in which each tree leaf is made of a JLabel (displaying an amount and with a coloured background), followed by a normal String (the label of this amount).
An array (of arrays) of Ojects describes the tree that I want to display in a Swing JPanel of Container, as in the "2.1 Simple JTREE Example" at URL
http://www.apl.jhu.edu/~hall/java/Swing-Tutorial/Swing-Tutorial-JTree.html
So, using the "DefaultMutableTreeNode" class and a "private DefaultMutableTreeNode processHierarchy(Object[] hierarchy)" re-entering function.
Either the 'nodeSpecifier' is of type 'new Object[]', and the 'processHierarchy()' interpretes it as a new node,
Or the 'nodeSpecifier' is of type 'JLabel' (or 'String'), and the 'processHierarchy()' has to interprete it as a new leaf.
Of course, 'JLabel', as 'String', is also a subclass of 'Object'.
 BigDecimal TotalDistrNetBeh1= 1.11;
 Object[] hi�rarchie =
 { "Blablabla",
 new Object[]
 { "Bloc de compteurs",
 new Object[] { "Total1" + " : The 1st listed item = The title of this node",
 new JLabel(TotalDistrNetBeh1.toPlainString()),
 /* + "DistrNetBeh1" */
 new JLabel(" 2.22")
 /* + "DistrNetBeh2" */
 new Object[] { "Total2" + " : Title of this node",
 new JLabel("Total Bijdrage Herniewbare energie"),
 /* Test : Leaf of type 'String' mixed with leaves of type 'JLabel'.
 "Total Opties : French and Dutch",
 "<html>Total Bijdrage WarmteKrachtKoppeling</html>",
 TotalDistrNetBeh1.toPlainString() + "Test1",
 new JLabel("<html>Total Test2</html>")
 };In the displayed tree, rows with JPanel appear like this :
javax.swing.JLabel[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=8388608,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,horizontalAlignment=LEADING,horizontalTextPosition=TRAILING,iconTextGap=4,labelFor=,text= 2.22,verticalAlignment=CENTER,verticalTextPosition=CENTER]
instead of simply " 2.22", as if there is a hiden (java.lang.String) casting. Why ?
Nevertheless, the 'nodeSpecifier' argument in
 else
 child = new DefaultMutableTreeNode(nodeSpecifier); // Leafis casted to (javax.swing.JLabel)
and 'child' and 'node' - both of 'Object' type - seem to be casted to (javax.swing.tree.DefaultMutableTreeNode)
For memo :
 private DefaultMutableTreeNode constructHi�rarch(Object[] hi�rarchie)
 { DefaultMutableTreeNode node = new DefaultMutableTreeNode(hi�rarchie[0]);
 DefaultMutableTreeNode child;
 for(int i=1; i<hi�rarchie.length; i++)
 { Object nodeSpecifier = hi�rarchie;
if (nodeSpecifier instanceof Object[]) // Node with children
// Re-entering the function
child = constructHi�rarch((Object[])nodeSpecifier);
else
child = new DefaultMutableTreeNode(nodeSpecifier); // Leaf
node.add(child);
return(node);
Is it "DefaultMutableTreeNode(nodeSpecifier)" or "add(child)" that cannot operate properly with a argument of type 'JLabel' ?
How to solve it ?
Sorry, I'm a beginner in Java and Swing.
Thanks in advance.

Learn to properly use a TreeCellRenderer
You never need to add a Component to a JTree, ie JLabel. You add the data, like a String, and then render the component you want to appear. Already, the String you have in your JTree are being rendered using JLabels, with a White Background. Hence, you need to provide a custom renderer that allows you to display different coloured rows depending on your condition or requirements.
Read a little more on the TreeCellRenderer here: http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html
ICE

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Mix string and tags

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Saving NSDatePicker to a string and saving that to NSUserDefaults...

Saving NSDatePicker to a string and saving that to NSUserDefaults I have it saved to a string then I have code that should save it to NSUSerDefaults so that when the program starts it is saved as the string not null. Here is the code [CODE]#import "MainView.h"
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softwarespecial wrote:
why can't I have the prefs saved in the .h
You can save that address in an ivar if you want to, but there's no purpose to that. The standardUserDefaults object is a +shared class object+. It's like a dictionary object that's maintained for your program by the NSUserPreferences class. You can read from or write to it at any time for the duration of your program. So whenever you get the shared object's address [NSUserDefaults standardUserDefaults], you're just getting the address of that same object each time.
In case the above doesn't make sense, I ran across a good explanation by Danneman in the last message on this page: [http://www.iphonedevsdk.com/forum/iphone-sdk-development/18716-set-settings-va riable-code.html].
When I did that as you so wisely pointed out it didn't work but when I saved it at each point I needed it it works.
When you change two things at once it's easy to forget the first and assume the second change solved the problem. Actually, I don't think saving prefs in your ivar had anything to do with your bug. What fixed it was getting a pointer to the shared std defaults object in this method:
-(void)permsavedattime
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; <-- get the shared object
tddate=[prefs stringForKey:@"testing"];
tdtime=[prefs stringForKey:@"timetesting"];
dateoutput.text =[[NSString alloc] initWithFormat:@"%@",tddate];
Without the first line of the above, I'm fairly sure that your prefs ivar was nil. I didn't see any code that initialized that ivar prior to the first time userdefaultdate ran. It looked to me like permsavedattime ran at start up, well before prefs was set in userdefaultdate. If you're interested in backtracking, restore the file to the way it was when you posted, then add a NSLog() like this:
-(void)permsavedattime
// NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; <-- get the shared object
NSLog(@"prefs=%@", prefs);
tddate=[prefs stringForKey:@"testing"];
tdtime=[prefs stringForKey:@"timetesting"];
dateoutput.text =[[NSString alloc] initWithFormat:@"%@",tddate];
I wish to save lets say five different things to NSUSerDefaults would I be able to do it all with my NSUserDefaults prefs or would I have to create a another one for some of them?
You know the answer to your second question now, right? The important point is that you're never creating the shared object, you're just asking for its address whenever you need it.
Btw, there's another user defaults method you should know about: The synchronize method writes the data to disk. You might want to do that when your app is ready to exit. E.g., in the app delegate:
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[prefs synchronize];
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On Mac OS X v10.5 and later, in applications in which a run-loop is present, synchronize is automatically invoked at periodic intervals. Consequently, you might synchronize before exiting a process, but otherwise you shouldn’t need to.
The above is in the iPhone edition, so I think it applies.
It might also be a good idea to update the data and call resetStandardUserDefaults in didReceiveMemoryWarning. I'm not clear about the need for reset either though, since the system may do that for you as well. But on a memory warning, you would definitely want to update the user default data if some of it is stored in an object to be released. You can find out how your app behaves on a memory warning by selecting Hardware->Simulate Memory Warning from the iPhone Simulator menu.
- Ray

What is difference between Null String and Empty String ?

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For the same reason I think it's okay to say "null
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Adding a jar to the classpath of an executable jar (mixing -jar and -cp)

Hello,
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Edited by: jduprez on Dec 7, 2010 11:35 PM
Ahem, the "Java application launcher" page bundled with the JDK doc (http://download.oracle.com/javase/6/docs/technotes/tools/windows/java.html) specifies that +When you use [the -jar] option, the JAR file is the source of all user classes, and other user class path settings are ignored+
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I would have thought that the main-class attribute of the JAR you name in the -jar option is the one that is executed.Then I still have the burden of copying that from the initial startup.jar's manifest. Slightly less annoying than copying the whole Class-path entry, but it's an impediment to integrating it as a "black-box".
The 'cascading' behavior is implicit in the specification
I know at least one regular in addition to me that would issue some irony about putting those terms together :o)
Anyway, thank you for confirming the original issue, and merci beaucoup for your handy "wrapper" trick.
I'll revisit the post markers once I've actually tried it.
Best regards,
Jérôme

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Solved!
Go to Solution.

Hi,
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I would like to compare two passwords encoded into two different's LDAP directory.
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This compiles and works (with 1.4):
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Anything else?

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However, I've had three problems:
1.) I'm using JLabels to display my board (8 x 8.. well actually 9 x 9 for an outer row labelled A,B,C,D.. 1,2,3,4...) Anyway, I create the JLabels using something that looks like \:
JLabel square = new JLabel(new ImageIcon("pic.png"));
Now, the picture loads properly, but it seems like the picture is being cropped, and the top and bottom are getting chopped off, so my 36 x 36 pixel *.gif appears to be 36 x 30.
You can see how there is a gap created in:
http://img235.imageshack.us/img235/7765/prob13ky.jpg
Now the problem may be with the GridLayout I am using, but I set the distance between the components in the container to be 0, 0 so I don't think that GridLayout is chopping my icons. I've also tried setPreferredSize(new Dimension(36,36))
for both my ImageIcons and JLabels and for my container (which I set to size 2000,2000, just to make sure there was room). If anyone can help me, it's be appreciated.
2.) I used to be able to view my outside row/column of squares that said A,B,C,D.... and 1,2,3,4... with the square in the corner having a random pic. For some reason now (have no clue why) I now see only the pic in the corner, and then a little gray smudge diagonally under it.
Pic:
http://img347.imageshack.us/img347/8308/prob24im.jpg
I don't know what's wrong. I'm pretty sure it's none of the new methods I've written, as those are all in my static void main (String[] ar) ...... and if I comment all the methods in my main except where I first make the JFrame and set it visible, it still turns out like that. repaint() doesn't help.
3.) For some reason, when I move another window (AIM, the console window, etc...) over my Swing window, it "erases" (turns gray, just wipes clean) the part where I have my squares that have pieces.
What's weird is that:
The border pieces (err.. my one visible corner piece from my second problem) don't get wiped, and some debugging text and JLabels (in a different JPanel) are fine. I don't think the JPanel matters though; the border pieces and the playing squares (which get wiped) are in the same JPanel and same array of squares.
repaint(); also erases ALL of my playing squares, whereas moving a window over them would only erase the part that the window covered.
Also, I added a mouseListener so that whenever I move the mouse over a square, it changes the image (to a tinted version, so you know the mouse is over it) and when you move the mouse away, it returns to normal. However, if I wildly swing the mouse around the area, it seems to lock up and freeze for a few seconds. Is there anything I can do to prevent this??
Thanks in advance.

It is hard to tell what your problems are without any code at all (I saw your images, but that doesn't make it easy to see what is wrong in your code). If you do post code, please use code tags (see button above posting box).
I've seen your MouseListener problem before--we had the exact same issue in our code at work. It would freeze up while it processed all of the mouse events (unbearably slow). I'm not at work right now, so I don't recall how it was fixed. Essentially, you need to only process the event periodically. You need to only update the image if the mouse switches squares. Or, only update the image if the distance from the last mouse event is more than some specified amount. We might also have checked the time difference between mouse events before processing a new one. I could look at the code at work tomorrow, if you are still having trouble.

Search for string and move decimal

Hello,
I am trying to write code that will search for a fractional string within an array and convert it from mV to V so it can be properly compared to the other fractional string numbers in the array.
I have an array that outputs x iterations each with a minimum and maximum column including several different types of decimal strings (negative/positive with several decimal places) each ending with either mV and V (example string: -725.543mV).
I then split the array into columns containing the minumum and maximum values of each iteration. I want to compare the minimum values of each iteration and find the most minimum, and do the same thing with the maximum values.
Unfortunatley the way I'm doing it, when I convert from fractional string to number it removes the V or mV unit label but does not convert the number from mV to V. so it compares -725.543mV with -52.334V as -725.543 & -52.334 thus declaring the mV value the most minimum. I need the program to recognize that mV is less than V or search each array for values labeled with mV and move the decimal place so it is in standard V format.
The unit label is actually part of the string and not the display (as you can see in the code I've attached) and I understand this is a little tricky with the way I have to do it. But this is a dumbed down chunk of code I will eventually incorporate into my larger program which reads the values and their units from several different types of oscilloscopes. The Scopes output the values as strings as they appear on the screen and don't differentiate between mV and V unless they are told to output the units which just tags them on the end of the string.
I'm sorry for the large post. SO to sum up I need to search an array to make sure all values have the same units, if they don't I need to convert each value to the proper unit and output the max and min from the resulting array. my code is attached. Thank you for your help.
Solved!
Go to Solution.
Attachments:
File manipulation.vi ‏15 KB

crossrulz wrote:
jcarmody wrote:
camerond wrote:
Sorry, Jim, that's not quite right. You forgot to consider significant figures (your third min is not quite right). [...]
Good catch, but, really?
That "Finally!" comes out to -5569492V to me. Holy crap. -5.569492MV! I think there's a problem there.
Carp! Stupid negative numbers, shouldn't be allowed. Put a piece of duck tape over the place for that negative sign, that'll fix it.
I'll get back, it's now a matter of principle.
Jim, how does your algorithm do when there are 8 or 9 sig figs, say -56.9492345mV? (Yep, too lazy to draw it in myself.)
Cameron
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