Change a J(Component ) propeties from a different class?

Hello,
I've got:
class FirstClass(){
   public JButton btnSend;
   private void SetDisable(){
         btnSend.SetEnable(false);
   FirstClass(){
    // Constructor stuff...
    SetDisable();
class SecondClass(){
   private void SetEnable(){
    /// somehow to enable the first class's buton
}As mentioned, I would like to enable the FirstClass button, which is impossible to do so beacuse the JButton is not static (and can't be) and niether the "Enable" function in the first class...
Help anyone? :-)
Thanks!

class FirstClass(){
   public JButton btnSend;
   private void SetDisable(){
         btnSend.SetEnable(false);
   public FirstClass(){
    // Constructor stuff...
    SetDisable();
    new SecondClass();   // <---- Problem, it asks for another parameter
class SecondClass(){
   private FirstClass firstClass;
   public SecondClass(FirstClass referenceToFirstClass){
      firstClass= referenceToFirstClass;
   Public SecondClass(){
   //Consctructor
   private void setFirstClassButtonEnabled(boolean enabled){
      firstClass.setButtonEnabled(enabled);
}I marked where my problem is...
and Thanks in advance, again! :-)

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Invoke a method in one class from a different class

I am working on a much larger project, but to keep this simple, I wrote out a little test that would convey the over all theory of the program.
What I am doing is starting out with a 2 JFrames and a Class. When the program is launched, the first JFrame opens. In this JFrame is a label and a button. When the button is clicked, the second JFrame opens. This JFrame has a textField and a button. The user puts the text in the textField and presses the button. When the button is pushed, I want the text that was just put in the textField, to be displayed in the first JFrame's label. I am trying to invoke a method in the first JFrame from the second, but nothing happens. I have also tried making the Class extend from JFrame1 and invoke it from there, but no luck. So, how do I invoke a method in a class from a different class?
JFrame1 (I omitted the layout part. I made this in Netbeans so its pretty long)
public class NewJFrame1 extends javax.swing.JFrame {
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     public NewJFrame1() {
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public class NewClass1 {
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private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
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Thanks

So, how do I invoke a method in a class from a different class?Demo:
public class Main {
    public static void main(String [] args) {
     Test1 t1 = new Test1();
     Test2 t2 = new Test2();
     int i = t1.method1();
     String s = t2.method2(i);
     System.out.println(s);
class Test1 {
    public int method1() {
     return 10;
class Test2 {
    public String method2(int i) {
     if (i == 10)
         return "ten";
     else
         return "nothing";
}Output is "ten".
Edited by: newark on May 28, 2008 10:55 AM

Updating Jlabel from a different class?

Hi,
Im in the middle of developing a program but swing is making it very hard for me to structure my code. The problem is I want to update the text of a Jlable from a different class when a button is pressed. THe event handling is done by a different class than the where the Jlabel is initiated which is why i think it doesnt work. But when the button is pressed it does execute a method from the main class that has the .setText() in it. Why wont the Jlabel update? Thank you

Thanks for your help but i am still having trouble.
This is the code from the button handler class
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Updating Swing components from a different class

I would like to use the JTextArea component in a JFrame to display fast updating text from my application. My application is very simple. When the app launches the GUI is created then my application engine would start processing and displaying text data into the GUI. After reading about Thread safety when using Swing components I concluded it would not be a good idea for my app engine class to update the JTextArea class directly using methods such as .append(String).
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Many Thanks in advance Sean

Hi
Why don't you just implement a basic callback method?
To do this the right way you should probably define a simple Interface that has a public method like updateProcessText(String s). Your swing class then implements this interface, basically forcing it to provide the public method you defined (this is no different than implementing ActionListener, which forces you to define actionPerformed). Secondly modify your processing class, so that it take's a class that implements the interface you just created, as one of the arguments in it's constructor. Lastly assign the argument from your construnctor to a private var - this will enable your processing class to have a handle to your swing class and update it as it pleases.
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Updating JPanel with buttons from a different class

I have a JPanel in a class that has a gridlayout with buttons in it for a game board. And my problem is that when I want to update a button using setIcon() the button doesn't change in the GUI because the buttons are in a different class. The JPanel is in a Client class and the buttons are in a GamePlugin class. I've tried a bunch of different things but none of them worked or it was way too slow. I'm sure theres an easy way to do it that I'm not seeing. Any suggestions? Heres part of my code for updating the GUI.
private JPanel boardPanel = new JPanel();
Container cP = getContentPane();
cP.add(boardPanel, BorderLayout.WEST);
boardPanel.setPreferredSize(new Dimension(400, 400));
boardPanel.setLayout(new GridLayout(8, 8));
cP.add(optionsPanel, BorderLayout.CENTER);
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txp200:
I agree that a call to validate() , possibly repaint(), should fix your problem. In the class with the panel that the buttons are on, i would create a static repaint method that call panel.repaint(). You can then call that method in your other class. Just make sure u only use methods to change the properties of the button, never make a make a new one, as then you will lose the association with the panel. Hope this helps.
-- Brady E

Problem Using toString method from a different class

Hi,
I can not get the toString method to work from another class.
// First Class Separate file MyClass1.java
public class MyClass1 {
     private long num1;
     private double num2;
   public MyClass1 (long num1, double num2) throws OneException, AnotherException {
        // Some Code Here...
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   public String toString() {
        return "Number 1: " + num1+ " Number 2:" + num2 + ".";
// Second Class Separate file MyClass2.java
public class MyClass2 {
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}My problem is with the System.out.println(myobject);
If I leave it this way it displays. Number 1: 0 Number 2: 0
If I change the toSting method to accept the parameters like so..
public String toString(long num1, double num2) {
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The desired output is:
"Number 1: 3456789 Number 2: 150000."
Thanks a lot in advance for any advice.

Well here is the entire code. All that MyClass1 did was check the numbers and then throw an error if one was too high or too low.
// First Class Separate file MyClass1.java public class MyClass1 {
     private long num1;
     private double num2;
     public MyClass1 (long num1, double num2) throws OneException, AnotherException {
     // Check num2 to see if it is greater than 200,000
     if (num2 < 10000) {
            throw new OneException("ERROR!: " +num2 + " is too low!");
     // Check num2 to see if it is greater than 200,000
     if (num2 > 200000) {
            throw new AnotherException ("ERROR!: " +num2 + " is too high!");
     // Override the toString() method
     public String toString() {
          return "Number 1: " + num1+ " Number 2:" + num2 + ".";
// Second Class Separate file MyClass2.java
public class MyClass2 {
    // Main method where the program begins.
    public static void main(String[] args) {
        // Instantiate first MyClass object.
        try {
           MyClass1 myobject = new MyClass1 (3456789, 150000);
           // if successful use MyClass1 toString() method.
           System.out.println(myobject);
                     // Catch the exceptions within the main method and print appropriate
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         } catch (OneException e) {
              System.out.println(e.getMessage());
         } catch (AnotherException e) {
              System.out.println(e.getMessage());
         }I am not sure what is buggy. Everything else is working fine.

Calling a method from a different class?

Ok..
I been trying for hours... but im stumped.
How can I get this to work?
(Note: I cut this code down from over 600+ lines of code.. I left in a REALLY raw framework that shows where the basic problem is.)
public class Client extends JPanel implements Runnable {
// variable declarations...
    Socket connection;
    BufferedReader fromServer;
    PrintWriter toServer;
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// GUI creation...
// Create the login JFrame
    Login login = new Login()
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class Login extends JFrame {
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     super("Login");
     pane = new JPanel();
     JButton cmdConnect = new JButton("Connect");
        pane.add(cmdConnect);
     setContentPane(pane);
     setSize(300,300);
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     cmdConnect.addActionListener(new ActionListener(){
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}

Your posted code shows Login as an inner class. So one way to solve your problem is.
1. Make an instance variable to hold the instance. For example, after "PrintWriter toServer;" add "private Client client;"
2. In the Client constructor, add a line "client = this;"
3. In the Login actionPerformed(), use "client.connect();"
Another way is to have Login keep a reference to the Client that created it.
1. Add an instance variable to Login "private Client client;"
2. Change the Login constructor "public Login(Client c) {"
3. Add a line in the constructor "client = c;"
4. In the actionPerformed() "client.connect();"

Using main class's methods from a different class in the same file

Hi guys. Migrating from C++, hit a few snags. Hope someone can furnish a quick word of advice here.
1. The filename is test.java, so test is the main class. This code and the topic title speak for themselves:
class SomeClass
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public class test
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          SomeClass someObject = new SomeClass();
          someObject.SomeMethod();
     public static String SomeOperation()
          return "SomeThing";
}The code works fine. What I want to know is, is there some way to use test.SomeOperation() from SomeClass without the test.?
2. No sense opening a second topic for this, so second question: Similarly, is there a good way to refer to System.out.println without the System.out.? Like the using keyword in C++.
Thanks.

pfiinit wrote:
The code works fine. What I want to know is, is there some way to use test.SomeOperation() from SomeClass without the test.?Yes you can by using a static import, but I don't recommend it. SomeOperation is a static method of the test class, and it's best to call it that way so you know exactly what your code is doing here.
2. No sense opening a second topic for this, so second question: Similarly, is there a good way to refer to System.out.println without the System.out.? Like the using keyword in C++.Again, you could use static imports, but again, I don't recommend it. Myself, I use Eclipse and set up its template so that when I type sop it automatically spits out System.out.println(). Most decent IDE's have this capability.
Also, you may wish to look up Java naming conventions, since if you abide by them, it will make it easier for others to understand your code.
Much luck and welcome to this forum!

Accessing XML data from a different class

Hi all,
I have an xml class that loads xml data, I need to access the data from another class. I have imported the xml classinto the new class and created a new instance of it. However when I try to access the xml data it is coming back as null. I understand this is almost certainly because when it is called the xml data hasn't completed it's load. How can I get round this?
xml class:
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Thanks in advance

One of the ways:
package {
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Usage:
var xmlLoader:XMLLoader = new XMLLoader();
xmlLoader.addEventListener(Event.COMPLETE, onXMLLoad);
xmlLoader.loadXML("images.xml"):
function onXMLLoad(e:Event):void{
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Problems calling a method from a different class

Like many programmers, I'm having a go at making my own chat room. All has been going well so far, however I am having trouble calling the method which connects the client to the server, from the method which actually starts the server.
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Sorry, connectTo comes from:
connectToMethod connectTo = new
connectToMethod();
That doesn't necessarily mean this variable reference is the same one as in the code where the NullPointerException was thrown though.
Or the exception was thrown inside the start() method. The runtime isn't lying to you. You have a null reference (pointer) where it says you do.

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                .addContainerGap()
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                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
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                            .addComponent(cbPuerto, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
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Thanks for replying...
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</code>
The second code fragement is from the second class NewTrainStationFrame (which is not a subclass) which contains a jframe, jtextfield and a button. the method call to the stationModel(stationModel = AbstractTableModel) is done via: TrainServiceFrame.updateStationTable() when the submit button is clicked sending the string to a method ( addNewStation(newStation); )which updates the db.
<code>
button.addActionListener(new ActionListener() {
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                    newStation = newStationField.getText();
                    addNewStation(newStation);
// this would retrieve the updated db results + store in a TreeSet object
// TrainServiceFrame.getTrainStations();
                    TrainServiceFrame.updateStationTable();
</code>
I have just noticed something that is missing which when attempted to fix resulted in the same problem. there should also be a method called to retrieve the updated db, but as this is from a static context yet again i fall into the same ditch as the variables that store these db results are non-static and exist within the TrainStationFrame class.
Is the solution simply to change these relevent variables and methods that are to be called from another class, so that they are all static?

Display from non-MIDlet class?

Display from non-MIDlet class?
I havel a method in my main MIDlet that flashes up a message as an Alert:
public void doAlert(String sAlertText) {
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public class Boss extends MIDlet implements CommandListener {
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So, how do you obtain a reference to the currently-running MIDlet or its Display from a different class?

Thanks for your reply, but i finally solved it. I found a way of getting a reference to my MIDlet, so i had the control of its display.
Maybe it could be a good idea having some classes to write to the cellular's screen without being a MIDlet, like System.out.* classes in traditional Java.
See you.
David.

Changing tab name in one component that used in different applications -FPM

Hi gurus,
I have an FPM component configuration, which have different tabs.
This component i have used in different applications.
I just want to know how can I dynamically change the name of one tab in different applicatins?
I want to change only the tab name. content in the tab is same.
For eg. If I open a Bid from Rfx, it should show "Rfx Information" as one tab name. But if i open a bid from Auction, it should show 'Auction Information'.
Content in this tab is same.
Is there any way to do that? Or shall I create different component config. for bid to use in Auction application and another one for RFx application?
Thanks,
Poduval

Hi, 3Sherill3. This may help:
http://www.macupdate.com/info.php/id/16620

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