Backslashes and the CompositeName class

I am running J2SDK 1.4.2_06 on a Windows 2000 Server and developing a custom e-mail package that uses the Java Beans EMail class. Everything is working correctly with one exception: file attachments. The problem is when I try passing the filenames argument to the EMail send method that parses them, it fails because the filenames have only one backslash in them rather than two (e.g. "C:\temp\fileA.doc;C:\temp\fileB.doc;C:\temp\fileC.doc"). I cannot hard-code or manually edit the file list because it is generated dynamically each time the program is run.
The EMail class send method requires that the filenames/attachments be in the form of a String with semi-colons as the delimiter for each filename. I read that there is a CompositeName class that is a member of javax.swing that may help resolve this problem but I cannot find any documentation on how to use it. Any suggestions would be appreciated.

The backslash "\" is a special character (or meta
character) that must be escaped.
Can you give me a one-line code sample on how to
convert the "\" to "\\" using a reg expression in
Java?If you are talking about Strings, then the \ only has to be escaped if you write it as a String (i.e. it's hardcoded) you should not escape it if you read it from a file, textfield, network connection etc.
/Kaj

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Difference between abstract class and the normal class

Hi...........
can anyone tell me use of abstract class instead of normal class
The main doubt for me is...
1.why we are defining the abstract method in a abstract class and then implementing that in to the normal class.instead of that we can straight way create and implement the method in normal class right...../

Class vs. interface
Some say you should define all classes in terms of interfaces, but I think recommendation seems a bit extreme. I use interfaces when I see that something in my design will change frequently.
For example, the Strategy pattern lets you swap new algorithms and processes into your program without altering the objects that use them. A media player might know how to play CDs, MP3s, and wav files. Of course, you don't want to hardcode those playback algorithms into the player; that will make it difficult to add a new format like AVI. Furthermore, your code will be littered with useless case statements. And to add insult to injury, you will need to update those case statements each time you add a new algorithm. All in all, this is not a very object-oriented way to program.
With the Strategy pattern, you can simply encapsulate the algorithm behind an object. If you do that, you can provide new media plug-ins at any time. Let's call the plug-in class MediaStrategy. That object would have one method: playStream(Stream s). So to add a new algorithm, we simply extend our algorithm class. Now, when the program encounters the new media type, it simply delegates the playing of the stream to our media strategy. Of course, you'll need some plumbing to properly instantiate the algorithm strategies you will need.
This is an excellent place to use an interface. We've used the Strategy pattern, which clearly indicates a place in the design that will change. Thus, you should define the strategy as an interface. You should generally favor interfaces over inheritance when you want an object to have a certain type; in this case, MediaStrategy. Relying on inheritance for type identity is dangerous; it locks you into a particular inheritance hierarchy. Java doesn't allow multiple inheritance, so you can't extend something that gives you a useful implementation or more type identity.
Interface vs. abstract class
Choosing interfaces and abstract classes is not an either/or proposition. If you need to change your design, make it an interface. However, you may have abstract classes that provide some default behavior. Abstract classes are excellent candidates inside of application frameworks.
Abstract classes let you define some behaviors; they force your subclasses to provide others. For example, if you have an application framework, an abstract class may provide default services such as event and message handling. Those services allow your application to plug in to your application framework. However, there is some application-specific functionality that only your application can perform. Such functionality might include startup and shutdown tasks, which are often application-dependent. So instead of trying to define that behavior itself, the abstract base class can declare abstract shutdown and startup methods. The base class knows that it needs those methods, but an abstract class lets your class admit that it doesn't know how to perform those actions; it only knows that it must initiate the actions. When it is time to start up, the abstract class can call the startup method. When the base class calls this method, Java calls the method defined by the child class.

External swf and the tween class

i have an external swf which i import into my main swf using
the loadMovie command. my external swf has some tween class
animations in it. if i run the main movie, the external swf movie
runs fine of course...but the tween classes are not loaded. am i
missing somthing?
here is the code from the external swf file which is applied
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this.onRollOver = function() {
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try inserting the following to line 1,frame 1 your main swf:

Executable JAR file: Could not find the main class.

Hello,
I have a problem with making an executable JAR file.
I have written a JAVA program that consists of five different classes of which User.java is the main class and I have saved a text document with Main-Class: User and a blank line after that.
If I try:
jar cmf MainClass.txt User.jar User.class Beheerder.class Operator.class Manager.class MaakVisueelSchema.class
it makes a executable jar file which actually works! :)
But when the Operator class trys to open the MaakVisueelSchema class the screen stays blank.
I can run MaakVisueelSchema with java MaakVisueelSchema.
So I tried to make an executable JAR that consists only of MaakVisueelSchema, the same way as I did for User:
Main-Class: MaakVisueelSchema
jar cmf MainClass.txt MaakVisueelSchema.jar MaakVisueelSchema.class
Then I get the error message:
Could not find the main class. Program will exit.
from the Java Virtual Machine Launcher.
The big difference between MaakVisueelSchema and the other classes is that MaakVisueelSchema contains a PaintComponent method and an ComponentListener. Is it possible that one of those creates the error?
Can anyone help me with this problem?
Thanks in advance!
Bye!

Yes,
I tried:
jar xvf MaakVisueelSchema.jar
and it returns:
META-INF/
META-INF/MANIFEST.MF
MaakVisueelSchema.classN/G. You need to manually create a manifest file in a text editor, have it point to your main class, and enter it in your jar command as an argument.

My derived class suddenly doesn't recognize the parent class

I had my assignment coded, debugged, working and ready to go. So I bring my flash drive upstairs to play around with it on my other computer. When I compile the base class it compiles fine, but now when I try to compile the derived class, and the test class with the main method, I'm coming up with errors.
They have something to do with the base class not being recognized, because I can't instantiate any objects of the class now, and i get an error when attempting to compile the derived class to the effect of "cannot find symbol; symbol: class BaseClass". i get this error throughout the derived class, from the initial declaration of the class (public class DerivedClass extends BaseClass), to any references made toward methods of the parent class.
My base class compiles with no problem, but it's like nothing else is able to "use" it. I'm not sure if it has something to do with the PC im using now, and I can't confirm this at the moment because the PC I used to write the code is down (waiting on an upgrade).
ehhh.....help.
Message was edited by:
asphaltninja
null

It's not the fault of the computer hardware.
It's not the fault of the operating system.
It's not the fault of the JDK.
So don't go rebooting or reinstalling anything. The problem is that you didn't set up things on the new computer in the same way they were set up on the old computer.
In particular the compiling problem is that the compiled version of BaseClass isn't in the classpath when you try to compile DerivedClass. I can't tell why from your description.

Documentation of the Navigator Class, Picklist, & Wizard Class

Documentation of the Navigator Class, Picklist, & Wizard Class
May I have a copy of the oracles documentation on how to create a navigato, picklist and the wizards class based on the stnd20**.olb
i will appreciate it much.
thank you.
[email protected]

I don't think there is a documentation on this.
Just download the demos from OTN and look at the source for the fmb's that use those.
(By the way it is good enough to send your question once :-)

The runtime and the compile-time

Hello,
I am a beginner of java,I want to know something about the runtime and the compile-time.Please explain them to me.
Thanks very much!

Hi,
Consider 2 variables in a class
public class A
         int i = 10;
         final int j = 20;
      public static void main (String a[])
            System.out.println ("Value of i = " + i);
            System.out.println ("Value of j = " + j);
}This is compiled and the compiled class will look like:
public class A
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         final int j = 20;
      public static void main (String a[])
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            System.out.println ("Value of j = " + 20);
}The difference is that the compile time variables are determined and replace by Java where as the variables like i are only executed or processed when the program runs.
This is one example. There are multiple examples.
Thanks and regards,
Pazhanikanthan. P

JSP page and the pageContext.forward() method

I am running JSP pages on a coldfusion site so that a CF page (i.e. login.cfm) hosts my login.jsp page. I want to reload the JSP page without having to reload the cfm page each time. pageContext.forward() does do this, however, it only forwards on to a new page. I want to be able to reload a page with the new URL parameters (e.g. when there is an error, login.jsp will reload and give the user an error). What is a method to reload the page with the proper URL variables?
The following code does not work:
pageContext.forward("login.jsp?operation=user_edit&jsessionid=" + f_URLEncode(session.getId()));
Because it runs from the login.jsp page (the forward command only goes to a new page)

Just to clarify...
I log into your site. The first page shown is the CF page. The CF page automatically redirects me to the JSP page. Then what, exactly?
Does the login page automatically determine my URL, attempt to validate it, and if it doesn't work, it reloads the page?
The reason I ask is because there is a difference between the resulting HTML page and the JSP class file that generates that HTML page. Generally speaking, most web servers, particularly Tomcat, do not recompile the JSP class file, they just simply pass the parameters to the existing class file, and a new HTML page is generated.
So technically speaking, every time you visit the login.jsp page, you will get a brand new HTML page. The contents of that page are the same because you presumably pass the same parameters to the class which hasn't changed. But in other words, no, you can't forward to an "old" page that was previously generated by the class - each time the web server calls that class, it creates a "new" page.
Or are you saying that every time you attempt to forward to the login.jsp page, the system erronously calls the CF page instead?

How do I get backslash and @ in Windows 7 runing parallel desktop.

Can anybody steer me the right way to get the backslash and the @ command in Windows 7 running under parallel desktop 6.? I need these two to get some programs up and going. Thanks.

Can anybody steer me the right way
The Parallels forums: http://forums.parallels.com
Apple discussions only provide support for Apple products

Difference between a java program and a java class

Hi there,
What is the difference between a java program and a java class?

HI,
A java class is an object - described in a .class file - which has been given properties and behaviours and which can be instantiated in a program.
A java program( application ) consists of at least one class (one of which must be declared public) and which executes its main() method ( of the public class ) when it is started.
Every program is a class but not every class is a program.
Examples:
A java program
// this simple program will print out the first command line argument you put
// in after calling : java ScreenWriter "arguments"
class ScreenWriter
public static void main( String [] args )
if( args.length > 0 )
System.out.println( args[0] );
A java class
//the Math class is already defined in the java.lang package
//and contains a constant for PI
//So I can include the Math class with the PI constant in my simple program
//and now I have a program that involves my ScreenWriter class and the Math class too.
class ScreenWriter
public static void main( String [] args )
if( args.length > 0 )
System.out.println( args[0] );
System.out.println( "The value of Pi is: " + Math.PI );
When you see package and import declarations at the start of a program they are there to ensure the compiler knows which classes are used in the program.
Hope that helps,
Terry

Privacy Modifiers and the difference.

Hello all,
I'm a student learning Java and I have an exam in a few days, my tutor is away and so im stuck on my own with my books and what help i can get from the internet. I am confused about the privacy modifiers. As far as i know there are 3 privacy modifiers and (correct me if im wrong) they go like this;
1) Public - available for use with any program
2) Private - only available for use within that program
3) Private Protected - Limited in use within the program, but can be used in other programs provided they have the appropriate method.
I have the following two classes;
public class Dog {
   String name = "Nanaki";
   int age = 18;
   public void speak() {
      System.out.println("Arf! Arf!");
class Speak {
   public static void main(String[] arguments) {
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      doggie.speak();
      System.out.println(doggie.name);
      System.out.println(doggie.age);
}The public privacy modifier on the dog class tells me that i can use this class in other programs. The public modifier on the method of the dog class tells me that I can use this method in other classes.
However when I remove the public modifier from the Dog class i can still run the Speak class and use the variables and methods from the Dog class. Why is this? Surely if i remove the public modifier than the class becomes private and I should not be able to access it from the Speak class.
Another thing that is bugging me. In the Dog class i have declared a variable called name which is of type String. This has no modifier attached to it so i assume it is a private variable and cannot be changed outside of its class. But I can run the speak program and it changes the variable name. I would have thought i could only do this if i had something like
public String name = "Red XII"; The modifiers don't seem to be working like i thought they were supposed to. Can someone please tell me why not.

So then what is the visibility of the default?
Thinking about it more i thought to myself that maybe the default modifier allowed the speak class access to the dog class because it was in the same folder (i.e in the same package). Hence the public modifier would only access to the dog class from the speak class if they were in two seperate packcages.
I thought i would experiment a bit more and decided to put the Dog class in one folder (folder A) and the Speak class in another folder (folder B). Then i set the variables in the Dog class to public like such;
public class Dog {
   public String name = "Nanaki";
   public int age = 18;
   public void speak() {
      System.out.println("Arf! Arf!");
}and the speak class remained the same;
class Speak {
   public static void main(String[] arguments) {
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      doggie.speak();
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}I compiled the dog class no problem. But I could not compile the speak class. I can't see any syntax or semantic errors so i do not understand why this didn't work. Hence what the four levels modifiers do.

How to use the Rectangle class to draw an image and center it in a JPanel

I sent an earlier post on how to center an image in a JPanel using the Rectangle class. I was asked to send an executable code which will show the malfunction. The code below is an executable code and a small part of a very big project. To simplifiy things, it is just a JFrame and a JPanel with an open dialog. Once executed the JFrame and the FileDialog will open. You can then navigate to a .gif or a .jpg picture and open it. What I want is for the picture to be centered in the middle of the JPanel and not the upper left corner. It is also important to stress that, I am usinig the Rectangle class to draw the Image. The region of interest is where the rectangle is created. In the constructor of the CenterRect class, I initialize the Rectangle class. Then I use paintComponent in the CenterRect class to draw the Image. The other classes are just support classes. The MyImage class is an extended image class which also has a draw() method. Any assistance in getting the Rectangle to show at the center of the JPanel without affecting the size and shape of the image will be greatly appreciated.
I have divided the code into three parts. They are all supposed to be on one file in order to execute.
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
public class CenterRect extends JPanel {
    public static Rectangle srcRect;
    Insets insets = null;
    Image image;
    MyImage imp;
    private double magnification;
    private int dstWidth, dstHeight;
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        insets = getInsets();
        this.imp = imp;
        int width = imp.getWidth();
        int height = imp.getHeight();
        ImagePanel.init();
        srcRect = new Rectangle(0,0, width, height);
        srcRect.setLocation(0,0);
        setDrawingSize(width, height);
        magnification = 1.0;
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        dstWidth = width;
        dstHeight = height;
        setSize(dstWidth, dstHeight);
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            if (img!=null)
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        catch(OutOfMemoryError e) {e.printStackTrace();}
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Opener().openImage();
class Opener{
    private String dir;
    private String name;
    private static String defaultDirectory;
    JFrame parent;
    public Opener() {
        initComponents();
     public void initComponents(){
        parent = new JFrame();
        parent.setContentPane(ImagePanel.panel);
        parent.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        parent.setExtendedState(JFrame.MAXIMIZED_BOTH);
        parent.setVisible(true);
    public void openDialog(String title, String path){
        if (path==null || path.equals("")) {
            FileDialog fd = new FileDialog(parent, title);
            defaultDirectory = "dir.image";
            if (defaultDirectory!=null)
                fd.setDirectory(defaultDirectory);
            fd.setVisible(true);
            name = fd.getFile();
            if (name!=null) {
                dir = fd.getDirectory();
                defaultDirectory = dir;
            fd.dispose();
            if (parent==null)
                return;
        } else {
            int i = path.lastIndexOf('/');
            if (i==-1)
                i = path.lastIndexOf('\\');
            if (i>0) {
                dir = path.substring(0, i+1);
                name = path.substring(i+1);
            } else {
                dir = "";
                name = path;
    public MyImage openImage(String directory, String name) {
        MyImage imp = openJpegOrGif(dir, name);
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        openDialog("Open...", "");
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            return;
        MyImage imp = openImage(directory, name);
        if (imp!=null) imp.show();
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            MyImage imp = null;
            Image img = Toolkit.getDefaultToolkit().getImage(dir+name);
            if (img!=null) {
                imp = new MyImage(name, img);
                FileInfo fi = new FileInfo();
                fi.fileFormat = fi.GIF_OR_JPG;
                fi.fileName = name;
                fi.directory = dir;
                imp.setFileInfo(fi);
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}

This is the second part. It is a continuation of the first part. They are all supposed to be on one file.
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    public void setProcessor(String title, ImageProcessor ip) {
        if (title!=null) this.title = title;
        this.ip = ip;
        img = ip.createImage();
        boolean newSize = width!=ip.getWidth() || height!=ip.getHeight();
     width = ip.getWidth();
     height = ip.getHeight();
     if (win!=null && newSize) {
            win = new ImagePanel(this);
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        CenterRect ic = null;
        win = new ImagePanel(this);
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            win.addIC(this);
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            int width = win.imp.getWidth();
            int height = win.imp.getHeight();
            Point ijLoc = new Point(10,32);
            if (xbase==-1) {
                xbase = 5;
                ybase = ijLoc.y;
                xloc = xbase;
                yloc = ybase;
            if ((xloc+width)>ijLoc.x && yloc<(ybase+20))
                yloc = ybase+20;
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                int y = yloc;
                xloc += XINC;
                yloc += YINC;
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               ic.setDrawingSize(width/scale, height/scale);
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        if (img==null && ip!=null)
            img = ip.createImage();
        return img;
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    public void setImage(Image img) {
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        ip = null;
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        show("");
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    public void show(String statusMessage) {
        if (img==null && ip!=null){
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        if ((img!=null) && (width>=0) && (height>=0)) {
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            draw();
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    if (comp==null) {
        comp = ImagePanel.panel;
        if (comp==null)
            comp = new JPanel();
    imageLoaded = false;
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        double progress;
        while (!imageLoaded) {
            if (imageUpdateW>1) {
                progress = (double)imageUpdateY/imageUpdateW;
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                    progress = 1.0 - (progress-1.0);
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Why do I get a class conflict between the Prepare SQL.vi and the Get Column Name.vi with the SQL Toolkit compatibility vis from the Database Connectivity Toolkit?

I have done extensive programming with the SQL Toolkit with LabVIEW versions through 6.1. My customer now wants to upgrade to Windows 7, so I am trying to upgrade to LabVIEW 2009 (my latest purchased version) using the Database Connectivity Toolkit, and the SQL Toolkit Compatibility vis. Everything seemed to be going okay with the higher level SQL operations, but I ran into trouble with the Get Column Name.vi.
The pictures below show the problem. The original SQL Toolkit connected the Prepare SQL.vi with the Get Column Name.vi with a cluster of two references, one for connection, and one for sql. The new compatibility vis have a class conflict in the wire because the Prepare SQL.vi contains a cluster with connection, and command references, but the Get Column Name.vi expects a cluster with connection and recordset references.
How do I resolve this conflict?
Thank You.
Dan

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I'm not sure why it worked before. Maybe the execute was hidden inside the prep VI or maybe you can get the column names out of the command object before execution. In general, I would recommend considering switching to the newer VIs.
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Class override, how to create the child class and then the base class

I started to write a program for a smart DMM, the problem is every version of the DMM the company change the communication commend.
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Thanks
Solved!
Go to Solution.

This can be done and I've done it on occasion.
You simply create the base class with the dynamic dispatch methods you require (connector panes need to be identical to thos of the child class).
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Is anyone else having email problems such as apps exiting in the middle of an email? It may be a wireless issue. I use First Class for work and yahoo email for personal. I will be in the middle of typing a long email and the app just quits, all data lost.

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Backslashes and the CompositeName class

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