Confused - jTree Questions

Hi
I have looked through the forum and other articles for answers to my questions but I am still confused.
In my SWING application I have a JTree which has Node Type binding on it and displays nodes corresponding to Master and Detail views.
What is the best way to capture the value of selected Node that is after a button is clicked?
Secondly what is the best way to create an empty unbinded JTree (When i try to add a JTree the default nodes such as colors, sports etc show up)?
What is the best way to populate this JTree? (The new JTree will be populated using the selected values from the first JTree after a button is clicked.)
Any help will be apreciated. I have no clue where to proceed.
Thanks in advance

See:
http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html
Frank

Similar Messages

ALI 6.5 | CSS folders confusion| Detailed question

Hi All,
i am using ALI 6.5 portal env deployed on WL10.0. I am pretty much new to this ALI Portal. I am very much confused with the css folders and files residing under PT_HOME folder.
Can anyone please explain about these folders and files. Please find my questions below.
a))
In 'PT_HOME\ptimages\tools\cssmill\css' folder i can see css files with the following naming convention.
d_mainstyle##-**.css
mainstyle##-**.css
mainstyle-**.css
What is the significance of these file types.
b))
We have css files in the following locations
PT_HOME\ptimages\imageserver\plumtree\common\public\css
PT_HOME\ptimages\imageserver\plumtree\portal\private\css
The first folder has copied files from CSS mill and pretty understandable. The second folder is having only one file 'mainstyle.css'. What is the significance of these CSS files and In which scenarios's styles from these files will be used.
Thanks in advance,
Gowtham J

its all quite simple really...
many years ago, long before the dinosaurs, the plumtree people developed the CSSMILL tool to generate stylesheets so you could basically have different colors for different areas of your portal. (Unfortunately, they didn't use any of the "C" in CSS mill, resulting in huge onerous stylesheets) These stylesheets generated by the cssmill are supposed to be copied over to PT_HOME\ptimages\imageserver\plumtree\common\public\css after you make updates. I think in practice, many people skip this process and just edit the few stylesheets that they need directly.
Fast forward to the present day, when the BEA (formerly plumtree) people are creating adaptive layouts. They have to add the styles for the new adaptive layouts and sexy new look of the 6.5 portal into the existing stylesheet. Instead of using the CSS mill, they put the new styles in its own stylesheet, but decided to name it so it is confusingly similar sounding to the existing stylesheets. This is PT_HOME\ptimages\imageserver\plumtree\portal\private\css\mainstyle.css.
as far as your question here:
d_mainstyle##-**.css
mainstyle##-**.css
mainstyle-**.css
if i understand it correctly.... the mainstyle-**.css are never actually used...they may have been used in the past, but nowadays teh only stylesheets that are used are mainstyle##-**.css. The d_ is for 508 compatability mode.
http://edocs.bea.com/alui/devdoc/docs60/Customizing_the_Portal_UI/Modifying_Portal_Style_Sheets/plumtreedevdoc_customizing_cssmill_intro.htm

JTree questions (1) Re-populating (2) Adding popups

Hi all,
I've just started to use a JTree in my application and I've encountered two
problems. Sorry if these have been covered before - I've been Googling around
for answers.
I have a UI panel ...
http://photos1.blogger.com/blogger/541/411/1600/TreeDemo.gif
... where a tree is populated with stock quotes from different
sources. The user selects the stock and the tree should update to show the
quotes for that stock. The quotes are read from a DB and I want the user to
be able to delete from the DB using a pop-up on the leaf nodes.
Problems
(1) Re-populating
The only way I've got this to work at this time is to create a new tree from scratch,
based on the stock name, then put it into a new scroll panel, remove the old scroll
panel from the container and add the new one. Not good is it? Nasty, nasty.
I've read a lot about needing to interact with the tree model - is that right?
(2) Adding popups
I want to be able to delete items from the DB by doing a right-click on the leaf
nodes and selecting "Delete" from the pop-up.
I find that I can't add a mouse listener to the DefaultMutableTreeNode used to
hold the leaf item. Should I subclass DefaultMutableTreeNode and implement some
interface to do this?
Any insights very much appreaciated.

I know I'm asnwering my own question here - but I found the answer to teh re-population question while waiting.
I now use the DynamicTree class that is included in the Sun tutorial here
http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html
Specifically, here
http://java.sun.com/docs/books/tutorial/uiswing/components/example-1dot4/index.html#DynamicTreeDemo
I'd still welcome any suggestions on the pop-up menu question!

Procedural confusion (several questions)

My task is to develop a Course Management System:
I have the desired variables for an abstract Course class which will be extended by 3 subclasses of CourseType
Side: this task is due in 6 days and the how and why are becoming blurred
At this time I don't have working code (when I run it I get no result) so I'm back to starting over
Q1 I want my subclasses to inherit my super variables but I understand that if I define 'private' variables they are not inherited .... which is 'proper coding'?
Declare the variables as public (available anywhere) or declare protected (there is no need for them to be accessed from outside the project).
appropriate security levels are one of the criteria of the task (and I've confused myself)
Q2 Methods will be inherited by subclasses, with mutator methods which provide subclass specific data being overwritten accordingly. Would I be correct in assuming the 'How' for this section will depend on my chosen option above?
Q3 In java 1.6; which is the preferred variable Array method .... Vector() or ArrayList() ?

Thanks Keith
This assignment is actually part 2, I missed the first part because my motherboard died (and the tutor hasn't posted the solution yet)
so I'm sort of working blind
Part 3 is to create the GUI App, so I'm trying to code with that in mind
in part 1, it was suggested that we use a Courses interface which would be implemented by the Course class (which is in turn, extended by CourseType classes; I don't understand interfaces so I've opted for an abstract Course class because I can't define methods in an instance.
I have the abstract Course class, a Student class, and I've tried to put together a working Course.CookingCourse subclass
package <packageName>;
import java.util.*;
public abstract class Course
    private int ID = 0;
    private String courseTitle;
    private String teacher;
    private int MAX_STUDENTS;
    private ArrayList listStudents = new ArrayList();
    private int totalStudents = listStudents.size();
    private double standardCharge;
    private double income;
    private double runCost;
     * A Scanner instance, for reading data inputs from the keyboard
    private static Scanner console = new Scanner(System.in);
    private String inputLine = console.nextLine();
    private String inputString = console.next();
    public int getID()
        return ID;
    public int newID()
        getID();
        ID = ID + 1;
        return ID;
    public String setCourseTitle()
        System.out.println("What is the Title of this Course?");
        courseTitle = inputLine;
        return courseTitle;
    public String getCourseTitle()
        return courseTitle;
    public String getTeacher()
        return teacher;
    public String assignTeacher()
        /** check if we have assigned a teacher yet */
        if (getTeacher().length() < 1)
            /** If there is no teacher, assign one */
            System.out.println("Who will teach this Course?");
            while (console.hasNext())
                String firstName = inputString;
                String lastName = inputString;
                teacher = firstName + " " + lastName;
        } else
            /** there is a teacher assigned */
        return teacher;
    public int setMAX_STUDENTS(int val)
        this.MAX_STUDENTS = val;
        return MAX_STUDENTS;
    public int getMAX_STUDENTS()
        return MAX_STUDENTS;
    public int getTotalStudents()
        return totalStudents;
    public double setStandardCharge(double charge) {
        this.standardCharge = charge;
        return standardCharge;
   public double getStandardCharge()
        return standardCharge;
    public double getIncome()
        return income;
    public double getRunCost()
        return runCost;
     * Calculates the running cost for the course, based on the formula
     * provided. The formula is entered per instance.
     * @return runCost
    public abstract double calculateRunCost();
}Do I need to define a constructor for an abstract class?
package <packageName>;
import java.util.*;
public class CookingCourse extends Course
    int ID = super.getID();
    String courseTitle = super.setCourseTitle();
    String teacher = super.assignTeacher();
    final static int MAX_STUDENTS = super.setMAX_STUDENTS(10);
    ArrayList listStudents;
    int totalStudents = super.setTotalStudents();
    double standardCharge;
    double income;
    double runCost;
    /** Default constructor */
    public CookingCourse()
        this.ID = super.newID();
        this.courseTitle = super.setCourseTitle();
        this.teacher = super.assignTeacher();
        this.MAX_STUDENTS = super.setMAX_STUDENTS(10);
        this.listStudents = new ArrayList();
        this.totalStudents = listStudents.size();
        this.standardCharge = setStandardCharge();
        this.income = 0.0;
        this.runCost = calculateRunCost();
     * Custom constructor with declared variable
     * @param courseTitle
    public CookingCourse(String courseTitle) {
        this.ID = super.newID();
        this.courseTitle = courseTitle;
        this.teacher = super.assignTeacher();
        this.MAX_STUDENTS = super.setMAX_STUDENTS(10);
        this.listStudents = new ArrayList();
        this.totalStudents = listStudents.size();
        this.standardCharge = setStandardCharge();
        this.income = 0.0;
        this.runCost = calculateRunCost();
     * Stores the standard charge for the course
     * @return standardCharge
    public double setStandardCharge() {
        double charge;
        if(courseTitle == "Italian Cooking"){
             charge = 500.0;
        } else { // courseTitle == "Seafood"
            charge = 700.0;
        this.standardCharge = charge;
        return standardCharge;
     * Calculates the cost of running the course according to the
     * formula provided
     * @return runCost
    @Override
    public double calculateRunCost()
        double formulaBase = 1000.0;
        double formulaVarient = totalStudents * 50.0;
        runCost = formulaBase + formulaVarient;
        return runCost;
}And, the Student class
package <packageName>;
import java.util.Scanner;
public class Student
    private String name;
    boolean fifty = false;
    boolean returning = false;
    private String address;
    private int age;
    private double courseFees = 0.0;
     * create a Scanner for reading data inputs from the keyboard
    private static Scanner console = new Scanner(System.in);
    private String inputLine = console.nextLine();
    private int inputInt = console.nextInt();
     * Student Constructor
     * Since each name will be unique, we create the student instance
     * by directly entering this information
     * @param name
    Student(String name)
        this.name = name;
        this.fifty = false;
        this.returning = false;
        this.address = setStudentAddress();
        this.age = setAge();
        this.courseFees = 0.0;
    public String setStudentAddress()
        System.out.println("Enter the Student's address: ");
        System.out.println("Hit <Enter> if not supplied");
        if (inputLine.length() == 0)
            address = "Address Unknown";
        } else
            address = inputLine;
        return address;
     * Calculates the Student's age by obtaining their Date of Birth and
     * comparing it to today's date.
     * By utilising this method, we can dynamically calculate the age of
     * returning students.
     * @return age
    public int setAge()
        // Get today's date, so we can calculate age
        long today = new java.util.GregorianCalendar().getTime().getTime();
        System.out.println("Enter the Student's Date of Birth: (dd mm yyyy)");
        int day = inputInt;
        int month = (inputInt - 1);
        int year = inputInt;
        long birthDate = new java.util.GregorianCalendar(year, month, day)
                .getTime().getTime();
        long diff = today - birthDate;
        // Convert milliseconds back to years
        long y_diff = diff / 1000 / 60 / 60 / 24 / 365;
        age = (int) y_diff;
        if (age > 49)
            fifty = true;
        return age;
    public double setCourseFees()
        // TODO
        return courseFees;
    public String getStudentName()
        return name;
    public String getStudentAddress()
        return address;
    public int getAge()
        return age;
    public double getCourseFees()
        return courseFees;
     * Add a new student
    public void addStudent()
        new Student(name);
}I have yet to create the StudentRegister class, which will be our expanding array list of all students registered regardless of enrolment status.
The ArrayLists within each Course will only contain students for that course (but I'm still unclear on the 'How' .... will consult textbook for that though)
Edited by: kcstingel on 21/04/2008 22:05

A confusing Partitioning question

I am partitioning all of the tables in my database into 6 partitions. It is based on a "District ID." Each table has this column, but the Company that is populating the database is only populating this field in one table(LOCATION) and leaving it null in all of the other tables. Can these other tables be partitioned on an update to this "District ID" field after all records have been inserted? Or can I have the database automatically partition these tables based on the foreign key relationship between the LOCATION.District ID field and the other_tables.DISTRICT_ID field? Essentially saying the LOCATION.DISTRICT_ID is in this partition so new record go to the same partition. Sorry for the confusion.

I am partitioning all of the tables in my database into 6 partitions. It is based on a "District ID." Each table has this column, but the Company that is populating the database is only populating this field in one table(LOCATION) and leaving it null in all of the other tables. Can these other tables be partitioned on an update to this "District ID" field after all records have been inserted? Or can I have the database automatically partition these tables based on the foreign key relationship between the LOCATION.District ID field and the other_tables.DISTRICT_ID field? Essentially saying the LOCATION.DISTRICT_ID is in this partition so new record go to the same partition. Sorry for the confusion. yes the partition key can be null. so you can create 6 partitioned tables and they will automatically
be managed by oracle. so when you insert the data into the child tables based on the district_id they will
go to a particular partition. you need not write any piece of trigger/update statement to manage this.
oracle will do this for you. the only thing is if most of the values for
district_id are null then you lose the advantage of using the partition
as most of the rows will end up in one particular partiion.

JTree questions

Hi!
What is the "best practise" on trees:
Where should you put the methods for adding / deleting / Changes nodes? (In the node-class itself?)
Where should you put listeners?
How is a tree painted in the fastest way when you have many nodes?
Thanks in advance!

Hello ekren
Where should you put the methods for adding / deleting / Changes nodes? (In the node-class itself?)Don't add or remove subnodes in the parentnode directly ! Use the methods from den DefaultTreeModel, or you will have problems with the GUI (JTree).
Where should you put listeners?This depends, what you want to do. The TreeModel for model-Events, the JTree for user-events. So what do you want to do ?
How is a tree painted in the fastest way when you have many nodes?When you have a custom TreeCellRenderer, then pay attention to your code, because the "getTreeCellRendererComponent"-method is called very often !
Cache resources, if needed, and don't perform time-expensive tasks !
Hope it helps
Freddy

Easy JTree question

I'm using something like the code below to "select" a node in my JTree. The node does get selected (an action is taken via the listener), however the node does not get selected in the graphical sense (i.e. the mouse selected node remains highlighted). How do I get the JTree to render the programatically selected node as the new selection?
jTree.setExpandsSelectedPaths(true);
jTree.setSelectionPath(jTreePath);
...Thanks

you could try something like this if you had all your
checkboxes named ina stuctured order I.E. checkbox_1, checkbox_2
ect.
countVar = 0;
//if you had 10 checkboxes I.E. i<11
add_btn.onPress=function(){
for(i=1; i<11; i++){
if(_root["checkbox_"+i].selected==true){
countVar+10
movieClip_mc.gotoAndPlay(countVar)
}

Quick JTree Question

Hello:
Is there a way to set a treeNode that does not currently contain any childern with the closedFolderIcon instead of the leafIcon?
Example:
If I created a node that allows childern, but is currently empty, I would like to display this node with the closedFolderIcon. This would be similar to an empty directory within a file system.
I plan on having a "Add Folder" and "Add Node" button to manipulate the tree.
When I add a rootNode to the JTree I get a leafIcon instead of the closedFolderIcon. I only get the closedFolderIcon once I have added a childNode to the rootNode.
Any ideas?
Thanks,
claude jones

Please read my posting more carefully. My reply said it was based on my assumption that he wanted to affect the presentation of the nodes, not the definition of what it means to be a leaf node.
In trees, a leaf node can not have children, ever. By his own posting, claude_jones said "a node that allows childern, but is currently empty". This is not a leaf node.
He also says, that of this node, "I would like to display this node with the closedFolderIcon". The key word here is "display". Right there, that tells you wants to affect the presentation of the original data, not the original data.
By the way, if you are still using DefaultTreeModel for your tougher tree problems, you might want to check out the JavaSoft tutorial on creating your own tree model classes. It makes a world of difference and makes your code a lot cleaner. If you're already familiar with this, I apologize.

General JTREE question ...

I'm creating a data-driven JTree. Changes to the JTree will be reflected immediately in the database. Also, the JTree might contain as many as 10,000+ elements.
Should I buffer this in some type of data structure (e.g. a hashtable ) or should I just write directly to-and-from the JTree? Will performance take a hit?
Thanks.

Depends where the changes are coming from. If they are being keyed by a human operator, then propagating those changes directly to the database should not be a problem. At least I don't find it a problem, and my larger JTrees contain over 10,000 nodes. At any rate, I would not design a complicated buffering system until I found there was a problem for it to solve.

JTree question

Hello !
I need some help creating TreeNodes in a tree.
first i will explain what i need.
I have a string that look like this:
d:\A dir\Another dir\file
That string is the complete path ro a file. that path is stored in a database.
I have no ideea how to create tree nodes that will look similar to:
+d
|- A dir
|--- Another dir
|-------file
Can anyone help me in this one please >
Thank you

http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html#display

Confusing Backup questions

Trying to help a friend recover his HD from drop.
Source is Powerbook running Tiger
I have a Macbook running leopard and a blank xternal drive w/ no O/S installed.
I want to clone the PB drive via Firewire to the blank xternal that is USB'd to my Macbook. Wh
When I try to migrate, it seems to want to overwrite my Macbook drive and I want it to copy to the external drive. Any hints?
Thanks.
JB

If you are wanting to clone it, follow these steps:
1. Put the PB in Target Disk Mode (hold T when booting up)
2. Connect the PB via Firewire to the MB, connect the external drive to the MB via USB. Both should be detected by the system and mount on the desktop. If, let's say, the USB drive does not mount, you may need to format using Disk Utility, so that it will mount and be fully recognized.
3. Download Carbon Copy Cloner http://www.bombich.com/software/ccc.html
4. Copy CCC to your applications folder and then run the app.
5. Click the drop down menu and select a source (the PB)
6. Click the drop down menu and select a target (The USB drive)
7. Make sure the cloning options mention Backup everything
8. Click the lock and authenticate as an administrator
9. Click clone
It will take a little while depending on the size of the drive and the fact that it is coming from a FW connection and moving to a USB connection, as well as the speed of the drives, but this should allow you to do a complete copy of the drive.
The other option is to use deploy studio. Here are the steps for that:
1. Follow steps one and two above
2. Download Deploy Studio (I recommend this only because Bombich no longer supplies NetRestore) http://www.deploystudio.com/Home.html You want to download Deploy Studio and not Deploy Studio server. It is located on the left hand side of the page toward the bottom.
3. Install and Open Deploy Studio
4. Select Image and create a master from a volume
5. Click on the pencil Icon
6. Click the plus button to create a new scenario
7. Click the pencil to edit
8. Enter a task name, Select the source as the PB, Select a location to store the image, have the type set as read only or compressed, leave the format as auto detect, and click save.
9. Click start. A restorable (sp?) image will be created and saved to where you told it to. (Preferably your MB's HD)
10. When the image is created select the restore tab in Deploy Studio
11. Select the image and the target (the target will be the USB drive)
12. Click restore. This will restore the image onto the USB drive and will allow it to be bootable on a PPC based computer.

Question about certificates required for publishing a script extension!

Hi,
I'm in the latest steps of creating my new In-Design plugin and I was studying the ways I can publish it and Adobe Exchange looks like a good option, but here they are saying:
Paid Content must have a certified signature. (Content posted as Free will be accepted with a self-signed certificate.)Extension Manager should be able to verify the Producer’s signature. An application should be signed by a certificate issued by one of the following certificate authorities:
Chosen Security Thawte, Globalsign, Verisign, Comodo, Usertrust, Godaddy
And here, they say:
blah ... so that you know that a trusted authority certificate will no longer be required. ...
So, I'm a bit confused, my question is:
1. is it required really to have these certificates?!
2. If yes, how we are supposed to do this?
Any idea would be much appreciated,
thx, mim

Westell/Airport Extreme/Airport Express question

I've read so many different options to extend a wireless network my head's spinning.
Have Westell DSL modem; Have had the Extreme also routing (but causing double NAT problems) so want to bridge it. Just got Airport Express, which I want to also put in bridge mode, connect to AEBS via Ethernet, providing wireless coverage in a distant room in the house.
Question 1:
Can both the Extreme and the Express be put in bridge mode, so that all they're doing is providing wireless coverage? I'd do all my Port forwarding in the Westell then.
Question 2: I thought I had the Express plugged into a port on the Extreme, but discovered it was actually plugged into the Westell (two wireless networks "side by side". If they're named the same, will it work that way? I would like access to the hard drive plugged into the Extreme, no matter which wireless network I'm accessing.
My suspicion is that the setup will work, but it's not *really* extending my Extreme network at all; it's just another network. All the IPs though are coming from the Westell.
I'm very confused!

Question 1:
Can both the Extreme and the Express be put in bridge mode, so that all they're doing is providing wireless coverage? I'd do all my Port forwarding in the Westell then.
Yes.
Question 2: I thought I had the Express plugged into a port on the Extreme, but discovered it was actually plugged into the Westell (two wireless networks "side by side". If they're named the same, will it work that way? I would like access to the hard drive plugged into the Extreme, no matter which wireless network I'm accessing.
Is your goal to have both AirPorts be connected back to the Westell gateway by Ethernet? If so, you can configure the entire network as a roaming network. If on the other hand, you will only have the Extreme connected to the gateway by Ethernet and the Express connected to the Extreme by wireless, then you can configure the AirPorts for an extended network?
Please check out this Apple Support article on extending networks with AirPorts.

Confused about wait()_, notify()

hey everyone,
i have a number of executing objects running on independent threads trying to access a single method in a single object. how best can i do this. i am kinda confused. the questions i as myself are should there be a wait and notify in the method that is being called? or is the wait and notify placed in the threads that are trying to call this method.? how do i do this? also when i call notify does it only notify the threads waitin on that particular lock that the notifying thread has locked?
pleas please help me..

yeah i see that that i did understand....this is what i am trying to do. i have a single method in an object which is basically a queue. i want multiple other thread to line up on this queue. so this is what i have in my code
boolean pleaseWait = false;
public synchronized void getOnLine(Truck t) {
while(pleaseWait) {
try {
wait();
catch(Exception e) {
truckLine.enQ(t);
pleaseWait = false;
notifyAll();
but this does not feel right.....i want to know should the above be done in this method or should it be done in the actual thread object that is trying to get on the line. as
public void run() {
synchronized(this) {
while(toAddress.pleaseWait) {
try {
wait();
catch(Exception e) {
toAddress.getOnLine(this);
notify();

Three questions on audio volume, widescreen, export

Hello,
I am in the heat of building my 40 minute slideshow imovie hd6 to idvd 08 project with some important questions.
first question: I have lots of voice audio and music loops which have been nicely edited, cleaned, normalized - all WAV files, high output, no distortion. I imported these to test into imovie then idvd and played on TV, and it was really LOUD. And some of the voices distorted a bit, and the music almost blew my speakers. I had the volume way down. Is idvd normalizing all the audio? What is happening? If I understand it, I can workaround it in Audacity. Just drop the gain a bit?
second question: I am confused about the standard vs. widescreen. I have been thinking about doing the project in widescreen, the dvds will be distributed to folks, free of charge. My format is PAL, I live in Spain. A film making friend told me that 50% of people had widescreen tv's these days. I'm confused.
third question: I want to both make a dvd with idvd and also have a master copy to give to production company who would rather have it in .mov format to make copies. What is the best way to export getting maximum quality of image and sound, but that I can transport to someone?
thank you,
Jenifer
ps I have crossposted to imovie hd6.

Hi
1.
iMovie 1 to HD 6 mainly are intended for two kind of materials (as I get it)
• Video - StreamingDV (as from a miniDV Camera) and via FireWire
• Audio - Except from Camera also .aiff 48kHz 16-bit
I would
• Convert the audio to .aiff 48kHz 16-bit
2.
Don't really understand. Most DVD-player can be set to match the Play-back device
eg Widescreen or CTR-TV
3.
DVD is a final product with a very reduced quality.
I only use miniDV tape and standard 4x3 TV-video as my material and to keep Maximum
Quality I always Copy-back to tape and deliver this. Then the reciever get's
100% of original quality.
If You use 16x9 HD then I don't know if Copy-back to tape is a working solution
for You. There are HDV-Cameras using a very similar tape as miniDV and this
should also keep Max Quality.
Yours Bengt W

Confused - jTree Questions

Similar Messages

Maybe you are looking for