Dialog class Questions

I have a Dialog class with 3 Panels and in the first panel I have 3 JRadiosButtoms, all this well except when the user begins to select some of the JRadiosButtoms all the me dialogue begins to move and the size of the components is readjusted and they move of position. That it could be happening?
Thanks
Mario

Hi everyone,
Yup that's normal. It
Yup that's normal. It happens usually in most
ost gui's
Richard WestI don't see how you can say that Richard! It is not normal and the OP does not provide enough information for a diagnosis.

Similar Messages

Extending the Dialog Class

Hey, I'm trying to extend the Dialog class into something called a DialogErrorBox, which is just what it sounds like: a dialog box specifically for telling the user about errors it encounters. Here's the code:
import java.awt.*;
import java.awt.event.*;
class DialogErrorBox extends Dialog implements ActionListener {
     public DialogErrorBox (Frame parent) {
    ...//modified to give a vague error message
     }//end constructor
public DialogErrorBox (Frame parent, String title, String message) {
    ...//worked as a function in my program
     }//end constructor
public void actionPerformed (ActionEvent evt) {
          this.dispose();
}The compiling error I recieve at both constructors is:
...cannot resolve symbol
symbol : constructor Dialog ()
location: class java.awt.Dialog
        public DialogErrorBox2 (Frame parent, String title, String message) {I can't figure out why this error would happen. I've made a class extending Frame(Frame and Dialog both extend Window) that looks almost exactly the same and it has no errors.
Help would be much appreciated.

A: Extending the Dialog Class

This is a short and spotty explanation, to get the full skinny you might read pages 69 and 70 of The Java Programming Language 3rd Edition, Gosling, et. al.
If you don't use the superclass's constructor or one your own as the first executable statement , the superclass's no arg constructor gets called. This means that super() will get called automagically! I don't believe that Dialog has a no arg constructor, so you are forced to do something.
You could also do something like this:
public DialogErrorBox(Frame frame, String title) {
this(frame, title, true);
}Now the two argument constructor invokes the three arument constructor with a default value of true.
Do you see why this must happen?

Can anyone help me change fonts and size on my page? I don't understand the class questions?

Can anyone help me change fonts and size on my page? I don't understand the class questions? All I want to do is change the font and size of a table or div.
http://www.allgearinc.com/AG12SSWL-Swift.htm -One problem page

If you want to change the fonts of the entire page then this code will do the trick:
body {
    font-size: 16pt;
    color: silver;
     font-family: whatever, goes, here;
If you want to change the fonts of ALL tables on a page then the code is something like this:
table {
    font-size: 20pt;
    font-family: "Courier New", Courier, monospace;
    font-style: italic;
    font-weight: bold;
what exactly do you want to change? Can you be a bit specific so that Ben or Ken can give you the exact code and tell you about the short-hand method to write the code in one line.
Have you bought a book on CSS yet? If not, it is a good idea to get one as a reference. Eric Meyer writes good books on CSS.

Inner Class Question

My question pertains to the code at the bottom of this post.
I don't understand why the compiler doesn't give an error for the line below. Why would it let you refer to something inside the class (in this case I'm referring to ClassWithInnerClass.MyInnerClass) unless it were static?
ClassWithInnerClass.MyInnerClass mic = cwic.retMyInnerClass();To illustrate why I'm asking, I created 2 ints ("regularInt" and "staticInt") inside class "ClassWithInnerClass". The compiler let me set the value of "staticInt" from within main whereas it wouldn't let me do so w/ "regularInt" (which is why I commented that line out). Don't get me wrong though - I understand the reasons why the compiler behaves as it does for "regularInt" and "staticInt". I understand that a static variable can be accessed without instantiating a class (and that there's only 1 created no matter how many classes are instantiated). I also understand that, to access a non-static variable, you need to instantiate a class. My question arises only because of trying to extend that logic to MyInnerClass.
I can already take a guess that the answer is going to be something like, "the reason it works this way is because class 'MyInnerClass' is just a declaration NOT a definiton". I guess I just want confirmation of this and, if possible, some reasoning behind this logic.
HERE'S THE CODE...
class CreateInnerClasses {
     public static void main (String args[]) {
          ClassWithInnerClass cwic = new ClassWithInnerClass();
          ClassWithInnerClass.MyInnerClass mic = cwic.retMyInnerClass();
          //ClassWithInnerClass.regularInt = 5;
          ClassWithInnerClass.staticInt = 10;
          mic.printIt();
class ClassWithInnerClass {
     public int regularInt ;
     static public int staticInt;
     class MyInnerClass {
          void printIt() {
               System.out.println("Inside ClassWithInnerClass.myInnerClass");
     MyInnerClass retMyInnerClass () {
          return new MyInnerClass();

The line    ClassWithInnerClass.MyInnerClass mic = cwic.retMyInnerClass();is accepted because the name of the inner class is ClassWithInnerClass.MyInnerClass. This has nothing to do with accessing fields even though the syntax is similar.
On the other hand, the line    SomeClassWithAnInnerClass.InnerClass ic = new SomeClassWithAnInnerClass.InnerClass();is not accepted because the nested class SomeClassWithAnInnerClass.InnerClass is not static: you must have an instance of the outer class available. The correct syntax for calling the constructor of the inner class would be    Outer.Inner instance = outerInstance.new Inner();In this case you could write:    ClassWithInnerClass.MyInnerClass mic = new SomeClassWithAnInnerClass() . new InnerClass();
    // OR:
    ClassWithInnerClass.MyInnerClass mic = cwic . new InnerClass();The Java tutorial has a pretty good explanation on nested classes:
http://java.sun.com/docs/books/tutorial/java/javaOO/nested.html
http://java.sun.com/docs/books/tutorial/java/javaOO/innerclasses.html

Some newbie POWL feeder class questions

Hi,
I'm just working with POWLs resp. the associated feeder class. At the moment I have two question that hopefully could be answered by someone:
1) Is it possible to modify the UI layout of the selection criteria in a way that they will be displayed in a configurable number of columns and not just one below the other?
2) I declared some criteria with "ls_seldef-kind = c_type_param.". The user should be able to work with wildcards for these criteria (option "CP"), but the criteria values given to the GET_OBJECTS method always do have the "EQ" option. This is not really useful for e.g. description fields. How can I change this?
Many thanks in advance for any help.

I also hope I can know how to do .
Pleae tell me if you have solved the problem .
Best regards ,

Importing Java Class Question

Hello,
Sorry for such a newbie question and such a long post, I did remember how to do this before but now I can't for the life of me remember. Anyhow, I have a simple question about importing custom-made java classes, from another directory in the windows operating system. I have the classpath set, and also I realize that because the two files below are in the same directory theres no need for an import statement as Java will look for the class in the same directory.
But I would like to know how the import statement is suppose to look to import a custom made java class from another directory, (assuming of course that I set the correct classpath)
here's the java class location:
c:\school\csc365\narcus.java
//narcus.java
import java.io.*;
class narcus implements Comparable
String firstName = "firstName";
String lastName = "lastName";
     public narcus()
     firstName = firstName;
     lastName = lastName;
     public narcus(String f)
     firstName = f;
     lastName = lastName;
     public narcus(String f, String l)
     firstName = f;
     lastName = l;
public String getFirst()
return "first..";
     public int compareTo(Object e)
     return 1;
Here's the location of the driver program thats suppose to use the narcus.java class
c:\school\csc365\test.java
//test.java
//import statement? maybe import "c:\\school\\csc365\\*"; ?
import java.io.*;
class test
public static void main(String[] args)
     narcus jim = new narcus();
     System.out.println("omg\n");
     System.out.println(jim.getFirst());
And also, here is my classpath:
PATH=c:\school\csc365\;c:\school\
The classpath also points to the jdk libraries and few other directories but I didn't write that above, as it probably isn't relevant.
I've tried the following import statements.
import "c:\\school\csc365\\narcus.java";
import "narcus.java";
import "c:\\school\\csc365\\*";
But I keep getting an error that says:
test.java:1 <identifier> expected
Any help is appreciated!

Hi Folks,
I am new to this forum, heard that interesting discussions always happens on this forum so immediately registered,don't want to miss any oppurtunity to participate in discussions.
I have pretty much basic question regarding compiling and exceuting files in different packages.I have the following directory structure
C:\Projects\WDPROEast\Development\CommonService\Code\Java from where java files stored in different packages as follows:
com\wdpro\commerce\common\crm\dae\nautilus\adapter directory has java files in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package.
com\wdpro\commerce\common\dae\exception has java files with package named com.wdpro.commerce.common.dae.exception.
com\wdpro\commerce\common\dls\exception has java files with corresponding package name.
com\wdpro\commerce\common\dto has java files under proper package name.
com\wdpro\commerce\common\exception has java files with appropriate package name.
com\wdpro\commerce\common\util has java files with package name. I am starting at Java Directory,want to compile and run file named a.java in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package with having all other java files on classpath as follows
so I issued command for compilation as follows C:\Projects\WDPROEast\Development\CommonService\Code\Java>javac com/wdpro/commerce/common/crm/dae/nautilus/ada
pter/a.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/NautilusServiceUtility.java com/wdp
ro/commerce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/
b.java com/wdpro/commerce/common/dae/exception/*.java com/wdpro/commerce/common/dto/*.java
com/wdpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dl
s/exception/*.java It compiled greatly but when I issue command to run a.class file as
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
ter/UtilityAccesssit's giving following exception
Exception in thread "main" java.lang.NoClassDefFoundError: com/wdpro/commerce/common/crm/dae/nautilus/adapter/
UtilityAccesssbut when I run a.java with the following command
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
ter/UtilityAccess com/wdpro/commerce/common/crm/dae/nautilus/adapter/NautilusServiceUtility.java com/wdpro/com
merce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/Nautil
usAccessUtility.java com/wdpro/commerce/common/dae/exception/*.java com/wdpro/commerce/common/dto/*.java com/w
dpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dls/exce
ption/*.javaSo my question do I need to add all required java files to path when required class files are under different packages?is it manadatory.
I hope you understand my question,pass me any comments you may have.
Thanks alot,
Anu

The arrays class question

consider the code below
int[] list = {2, 4, 7, 10};
java.util.Arrays.fill(list, 7);
java.util.Arrarys.fill(list, 1, 3, 8);
System.out.print(java,util.Arrays.equals(list, list));i understand line 2, it gonna fill 7 into the array,so the output would be Line 2: list is {7, 7, 7, 7}
my question is line 3, how come the output would be {7, 8, 8,7} what does 1 and 3 represent in a arrary?
the line 4 output would be {7, 8,8,7} again why?
Thank you guys whoever is gonna take to respond me questions

zerogpm wrote:
but which 2 lists were comparing ? since i have list list with the same name1) You're not comparing lists, you're comparing arrays.
2) You're comparing a single array with itself.
3) Objects, including arrays, do not have names. Classes, variables, and methods have names. Objects do not.

Where is the getString() implementation for RS and Object class question

Dear all,
I had these two questions ringing since a long time.
1)ResultSet is an interface.
In my jdbc code I have generally written rs.getString() and rs.getInt etc.. without giving a second thought as to where exactly is this getter implemented !
I have RTF API .. without too much help.
Could some one kindly explain Where is the implementation of the getString method ?
2) Could you please tell why the Wait() Notify() and NotifyAll methods have been implemented in the Object class ? What was the need to define em in the Object class ?
Thanks in advance for your time spent on this.
Rgds

Sarvananda wrote:
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
..Thats a design decision
One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
Rgds
>
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
..Thats a design decision
One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
A desire to not have to couple your code to a particular database and JDBC driver. It's a classic example of the abstract factory pattern

Inner classes question

Hi guys,
I have a question to ask - when i'm writing an inner class and i want to create a new instance from it, the Eclipse forces me to use an instance of the containing class to call new.
Is it how it's done or am i doing something wrong?
public class A
    // Some code here
    public class B
         //Some code here
}Trying to create an instance:
A a = new A();
A.B b = a.new B();

What you have defined is "non-static" inner class.A "non-static" can only be instantiated only if we create an object of outer class.True.
>
There are two ways to create "inner" class object,
1)The way you have written the codeTrue.
2)
    public class A
{    // Some code here
public void createInner()
classB b=new ClassB();
public classB
//Some code here
That code won't compile. Even if you corrected it so that it did compile, it doesn't really help in the OP's situation. Did you read the advice of Saish and Jos about why class 'B' probably shouldn't be public, anyway?

Parent Class question

I have a panel class with a slider on it .
pseudocode:
public class MyJSlider extends JPanel{
private JSlider myjslider;
private Color mycolor;
public Color getColor(){return mycolor;}
the action taken by the JSlider is to set mycolor to a new Color(r,g,b);
My question, is there away to call the class that istantiated teh MyJSlider objects paint method from the
JSlider action performed
Something like
slider_B.addChangeListener(
               new ChangeListener()
                    public void stateChanged(ChangeEvent e)
     mycolor = new Color(R,G,slider_B.getValue());
// super.paint() ????????

If it's an inner class like that, it has access to the outer class's fields and final instance variables.
You can access those methods implicitly.
But you typically don't call paint() directly, you call repaint(), which issues a call to the GUI to repaint itself. (Although maybe it's different in Swing, I don't know.)
When you post code please wrap it in [code] [/code] tags so it's easy to read.

JAXB class question

does anyone know which jar file has the javax.xml.XMLConstants class? I'm getting an error while going through some examples for JAXB and I am almost positive that my classpath is messed up or not pointing to the right jars.

Good job mate. That's the way!
And you came back and let us know we needn't waste precious time answering a solved question. That's just exellent. Thanks.
:)

Tutorial Q&E : Implementing Nested Classes, Question 2

//1.3
Taken from http://java.sun.com/docs/books/tutorial/java/javaOO/QandE/nested-answers.html
import java.util.*;
public class Problem {
public static void main(String[] args) {
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
System.out.println("Exiting.");
timer.cancel();
5000);
System.out.println("In 5 seconds this application will exit. ");
Question 2: The program Problem.java (above) doesn't compile. What do you need to do to make it compile? Why?
Answer 2: Add final in front of the declaration of the timer variable. A nested class declared within a method has access to any final, local variables in scope.
Could somebody please elaborate on this answer for me? I don't really feel it gives enough information for me to understand fully the "why?" part.
Thanks
Mark

Hi,
the problem is that the instace of the nested class is still existing after the execution of the method has been finished. But how should it have access to a variable which doesn't exists anymore?
The only way to solve this problem is to declare the variable as final. Because then the value of the variable is known when the instance of the nested class is created an can be copied. Then at each place in the nested class where the variable is used, the copy is used instead. This is only valid because the value of the variable cannot be changed after the creation of the nested class' instance.
Andre

GUI class question

Hi guys I use the NetBeans 6.0 and i build a project which has 2 Source packages on is my number game and the other I called GUI. In the GUI source package I drew a diagram which I want to use as my GUI to my number game but I don't know how to connect them. Now my question is this is it possible to connect them since they are in different packages? And my second queston is where should I code the action listenrs and where the event handler couse I am really new to gUI and that is my first one. Btw does net beans 6 provide some form of facility to join them both without much code? Thanks in advance!

1.I would say that using packages in this case is bad, but i wont since everyone else here thinks its always good. I would just use plain .java/.class files in the same directory so that they have free access to each other and the other files.
2. To use actions listener you first make your main class implement ActionListener, then addActionListener(this) to all your components that catch events, then use public void actionPerformed(ActionEvent e) to handle any events.

Really Basic OO Class Question...

heres the complete code for my applet...As i understand it this should make a "Car" class then should be generating a "car" object with the constructors marked...then i just use the g.drawstring to output this...but i get a nasty error message. Its something really simple, but its completely vexed me...thanks in advance.
import java.applet.*;
import java.awt.*;
public class Traffclass extends Applet {
     public void init() {
     public class Car {
          public int length, width;
          public Color carColor;
          public Car() { //constructor?
               length = 7;
               width = 5;
               carColor = new Color(200,10,60);
     private Car car = null;
     public void run() {
          car = new Car();
          repaint();
     public class Trafficlight {
          public boolean greenlight = true;
     public void paint(Graphics g) {
          g.drawString(""+car.length, 50, 60 );
     //     g.fillRect(car);
}

As stated the problem is solved now, but heres the error message in question...
Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
        at Traffclass.paint(Traffclass.java:39)
        at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)
        at sun.awt.RepaintArea.paint(RepaintArea.java:224)
        at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254)
        at java.awt.Component.dispatchEventImpl(Component.java:4031)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
grantedIt wasn't a compiler message (what i am used to) so it threw me a bit.

Portal dialog instance questions

Dear SDN,
2 questions on installing a dialog instance for the portal.
1. Does the dialog instance need to have a a different instance number than the central instance if it is on a separate physical host
2. Can you log onto the portal from the dialog instance?
dialog inst # = 3
Ci inst # = 1
i.e. http://dialoghost:50003/irj?
Thanks

Prakash Singh wrote:"No if the dialog instance is not on the same machine. 2. Yes you should be able to logon to portal from dialog instance. http://name of your dialog instance server: port/irj"
The above statement is accurate, because any SAP instance is uniquely identified by its hostname and its instance number. So, on the same host you must have a different instance number for your SAP instance and on multiple hosts you could run an SAP instance with the same instance number as your central instance.
Regards,
Phani.

Dialog class Questions

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