Pass arguments to class constructor

Hello,
Please who can help me to solve my problem? I dynamic
creating class and I want to pass arguments.
I know how can I do creating Function (apply), but I coulnd
find constructor - apply.
var c:Class = Class(getDefinition(className));
var instance:Object;
if(obj){
var args:Array = deserialize(obj);
if(args.length == 1)
instance = new c(args[0]);
else if(args.length == 2)
instance = new c(args[0], args[1]);
else if(args.length == 3)
instance = new c(args[0], args[1], args[2]);
else if(args.length == 4)
instance = new c(args[0], args[1], args[2], args[3]);
else if(args.length == 5)
instance = new c(args[0], args[1], args[2], args[3],
args[4]);
else if(args.length == 6)
instance = new c(args[0], args[1], args[2], args[3],
args[4], args[5]);
else if(args.length == 7)
instance = new c(args[0], args[1], args[2], args[3],
args[4], args[5], args[6]);
else if(args.length == 8)
instance = new c(args[0], args[1], args[2], args[3],
args[4], args[5], args[6], args[7]);
else
return serialize("Unexpected number of arguments");
}else{
instance = new c();
}

Even more follow up advice. Once you have fixed the problem you will then face a new problem.
Test.Inner i1 = t.new Inner(); // compile error
Test.Inner i2 = t.new Inner(1); // okayThis is due to the default constructor not being provided as you have defined your own constructor.

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Flash CS5 - code hinting doesn't show custom class constructor parameters

Hi I've got other strange problem my code hinting works almost fine the problem is that when I create my custom class object code hinting doesn't show what kind of parameters can be passed to the class constructor. It shows only "MyClass()", when i call a method like this class_object.methodName( - parameters show correctly. What can be the problem?

I do not work for Adobe, just a fellow forum dweller.
The example was made quickly because you said this:
I've tried flash builder but if there is a way to associate code directly from it to symbols on the timeline I haven't been able to find it.
Now you know how.
I'm sorry but I don't even have Flash CS6. I still use CS5.5 because I use Flash Builder 4.6 for everything I do. I merely use Flash Pro to generate quick libraries full of goodies and export a SWC to use in Flash Builder.
I realize it's obvious but you did ensure your preferences had hinting both enabled and the delay set low (or zero)? I can only show you a CS5.5 preference panel, I'm not sure if it's the same. Note one important thing in this photo which is "Cache size". I have mine on 800 files which seems to be fine. If you're pointing toward a HUGE library of classes you may want to increase that number and check completion again.

Passing arguments to a custom component in the constructor

I would like to know if it is possible to pass arguments to a
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within Actionscript. I've not seen anyone do this, so at the moment
I have a couple of public properties defined on the custom
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Another approach as opposed to creating init function is to link symbol with autogenerated class (just assign it a class but do not create *.as file for it) and use it just as graphical view with no functionality (well only MovieClip's functionality).
ViewClip.as
public class ViewClip extends MovieClip {
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How to run a java class from a shell script with passing arguments

hi,
I have a jar with all the required classes. I was using ant to run the classes i needed.
But now i want to use a shell script to run the class, also the class accepts some arguments so when script is run it should accept arguments.
So can any one tell me how to set class paths, jar location and call the required class from shell script or batch file with passing arguments to it.
Thanks in advance.

Let's say that the order of arguments is as below
1. Jar file name
2. Classpath
Your shell script would look like this
java -cp $CLASSPATH:$2 -jar $1 I am assuming that your jar file has the required main-class entry in its manifest. Note that $1...$9 represent the arguments to this shell script.
The same goes for a batch file
java -cp %CLASSPATH%;%2 -jar %1

Passing Arguments in a Multiple JFrame project

I am trying to pass Arguments from MainApp.java to SubApp.java.
Is there someone that have an example or fix the sample program included?
tks a lot
sage49
I based my program on the following 2 programs that I got from this forum!!
The following is the MainApp.java
import javax.swing.*;
import java.awt.event.*;
class MainApp extends JFrame {
    MainApp() {
        super( "Main Application" );
        JButton button = new JButton( "Show Sub Application" );
        button.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent e ) {
// need to pass a string to SubApp in the following line
                JFrame app = new SubApp();
                dispose();
        getContentPane().add( button );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        pack();
        show();
    public static void main( String[] args ) {
        MainApp app = new MainApp();
}The following is the SubApp.java
import javax.swing.*;
import java.awt.event.*;
class SubApp extends JFrame {
// need to accept a String as Arguments
    SubApp() {
        super( "Another Application" );
        JButton button = new JButton( "Show Main Application" );
        button.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent e ) {
                JFrame app = new MainApp();
                dispose();
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        pack();
        show();
    public static void main( String[] args ) {
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}

Hi,
I have done what you suggested, Now I get an error on the subApp on the main.
see What I tried in the code.
MainApp.java
import javax.swing.*;
import java.awt.event.*;
class MainApp extends JFrame {
    MainApp() {
        super( "Main Application" );
        final String a ="this is the string";
        JButton button = new JButton( "Show Sub Application" );
        button.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent e ) {
                JFrame app = new SubApp(a);
                dispose();
        getContentPane().add( button );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        pack();
        show();
    public static void main( String[] args ) {
        MainApp app = new MainApp();
}The SubApp.java
import javax.swing.*;
import java.awt.event.*;
class SubApp extends JFrame {
        private String mystring;
        SubApp(String mystring) {
        super( "Another Application" );
        this.mystring = mystring;
        JButton button = new JButton( "Show Main Application" );
        button.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent e ) {
                JFrame app = new MainApp();
                dispose();
        getContentPane().add( button );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        pack();
        show();
    public static void main( String[] args ) {
       // tried    =    SubApp app = new SubApp(mystring);
       // tried    =    SubApp app = new SubApp(a);
       // tried    =    SubApp app = new SubApp(String a);
       // tried    =    SubApp app = new SubApp(String);
        SubApp app = new SubApp();                // this is the line I get the error
}I get the following error:
Cannot find Symbol
symbol : constructor SubApp()
location: class SubApp
        SubApp app = new SubApp();Tks a lot
sage49

How to pass argument in main function ?

How to pass arguments in main function of one class from another class ?
I don't want to pass argument from command prompt.
I want to try something like this -
class Test{
public static void main(String args[]){
for(int i=0;i<args.length;i++)
     System.out.println(args);
class Fun{
public static void main(String args[]){
     Test t=new Test("Hello","good bye");
when i run Fun class it gives error.
Suggest me how can i do that.

In Fun class main method does not take arguments that is fine. In Test class instead of main method you can have constructor to take input parameters as suggested by BalusC
However, if you want to make your existing code work, you can call (though not appropriate) main() method of Test class from main() method of Fun class (As main() method is static object is not required to invoke this):
Test.main(new String[]{"Hello","good bye"});Here is your code:
class Test{
public static void main(String args[]){
for(int i=0;i<args.length;i++)
System.out.println(args);
public class Fun{
public static void main(String args[]){
//Test t=new Test("Hello","good bye");
Test.main(new String[]{"Hello","good bye"});
} Thanks,
Mrityunjoy

How can we pass argument to static block of code????

hi ,
My question is we can use static initialization block for having functionality like constructors for initializing static variable ,but we cannot pass arguments to static initialization block then how can I create functionality like parametrized constructors.Whats the alternative shall I use a static method to perform this functionality,since all methods in given class are static and
there is no need of creating instance of class.

jduprez wrote:
Hello Jussi,Salut Jérôme
That's probably a more maintenable design.
However what do you base your remark on - I'm struck by the word obviously?
Is there some design principle from which this advice so naturally ensues that it is obvious ?Yes I read my posting later on and thought about changing it, since it's not necessarily an obvious solution. I was making assumptions that I didn't clarify from the OP.
In the OP's case, the "state" on which those methods operate is apparently fixed, presumably at the beginning of the program, so what's wrong with all this staticness?
I can list:
- threading issues (a non-issue after some initialization phase), that you wouldn't have with immutable instances
- harder unit-testing (that's not an OO design problem, more a methodology problem)
- mix and confusion between static and non-static state if the class ever happens to have both, in future maintenance. All good points, I see all-static classes as a "code smell" and especially in this case when there's parametrization involved.
Now we just need to have the OP explain his situation a bit better.

More:Could u pls complete the following code by adding a class constructor?

Thank you for your concern about my post. Actually it is an exercise in book "Thinking in Java, 2nd edition, Revision 12" chapter 8. The exercise is described as below:
Create a class with an inner class that has a nondefault constructor. Create a second class with an inner class that inherits from the first inner class.
And I make some changes for the above exercise requiring the class which encloses the first inner class has a nondefault constructor.
There is something related to this topic in chapter 8 picked out for reference as below:
Inheriting from inner classes
Because the inner class constructor must attach to a reference of the enclosing class object, things are slightly complicated when you inherit from an inner class. The problem is that the �secret?reference to the enclosing class object must be initialized, and yet in the derived class there�s no longer a default object to attach to. The answer is to use a syntax provided to make the association explicit:
//: c08:InheritInner.java
// Inheriting an inner class.
class WithInner {
class Inner {}
public class InheritInner
extends WithInner.Inner {
//! InheritInner() {} // Won't compile
InheritInner(WithInner wi) {
wi.super();
public static void main(String[] args) {
WithInner wi = new WithInner();
InheritInner ii = new InheritInner(wi);
} ///:~
You can see that InheritInner is extending only the inner class, not the outer one. But when it comes time to create a constructor, the default one is no good and you can�t just pass a reference to an enclosing object. In addition, you must use the syntax
enclosingClassReference.super();
inside the constructor. This provides the necessary reference and the program will then compile.
My previous post is shown below, could you help me out?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//Could you please help me complete the following code by generating
// the Test class constructor to ensure error free compilation? Please
// keep the constructor simple just to fulfill its basic functionality
// and leave the uncommented part untouched.
class Outer {
Outer (int i) {
System.out.println("Outer is " + i);
class Inner {
int i;
Inner (int i) {
this.i = i;
void prt () {
System.out.println("Inner is " + i);
public class Test extends Outer.Inner {
// Test Constructor
// is implemented
// here.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Test(Outer o, int i) {
o.super(i);
}Note that this doesn't quite answer the question from Thinking In Java, since your Test class is not an inner class (though there is no difference to the constructor requirements if you do make it an inner class).

How to pass argument in manifest file

Hi,
I want to pass argument to main class in jar. Is there any option in manifest file.

Hmm..
Seems that my sentence above isn't so correct.
It possible to add custom attribute: value pairs into manifest file and
read it later from Java class.
Here is code sample:
public class ManifestTest {
    public static void main(String[] args) {
        try {
            java.util.jar.JarFile jar = new java.util.jar.JarFile(System.getProperty("java.class.path"));
            for (java.util.Iterator it = jar.getManifest().getMainAttributes().keySet().iterator();it.hasNext();) {
                Object curKey = it.next();
                System.out.println("key: " + curKey + ", value: " + jar.getManifest().getMainAttributes().get(curKey));
        } catch (Throwable t) {
            System.out.println("exception occured: " + t);
}

Class field initialization outside class constructor

Hi,
what are the benefits of initializing a class field outside the class constructor? I use this for fields, that i do not need to pass parameter to via the constructor. The code seems more clear/easy to read.

Hi,
what are the benefits of initializing a class field
outside the class constructor? I use this for
fields, that i do not need to pass parameter to via
the constructor.
The code seems more clear/easy to read.That's a pretty big benefit.
For another, consider when you have multiple constructors: you've factored
common code out of them (good) and made it impossible to forget to
initialize that field later when, later on, you write another constructor(also good).

Constructor and Class constructor

Hi all
Can any one explain me the functionality about Constructor and class constructor??
As well as normal methods, which you call using CALL METHOD, there are two special methods
called CONSTRUCTOR and CLASS_CONSTRUCTOR, which are automatically called when you
create an object (CONSTRUCTOR) or when you first access the components of a class
(CLASS_CONSTRUCTOR)
I have read the above mentioned document from SAP Documents but i found it bit difficult to understand can any one please help me on this??
Thanks and Regards,
Arun Joseph

Hi,
Constructor
Implicitly, each class has an instance constructor method with the reserved name constructor and a static constructor method with the reserved name class_constructor.
The instance constructor is executed each time you create an object (instance) with the CREATE OBJECT statement, while the class constructor is executed exactly once before you first access a class.
The constructors are always present. However, to implement a constructor you must declare it explicitly with the METHODS or CLASS-METHODS statements. An instance constructor can have IMPORTING parameters and exceptions. You must pass all non-optional parameters when creating an object. Static constructors have no parameters.
Class Constructor
The static constructor is always called CLASS_CONSTRUCTER, and is called autmatically before the clas is first accessed, that is before any of the following actions are executed:
Creating an instance using CREATE_OBJECT
Adressing a static attribute using ->
Calling a ststic attribute using CALL METHOD
Registering a static event handler
Registering an evetm handler method for a static event
The static constructor cannot be called explicitly.
For better understanding check the following code:
REPORT z_constructor.
      CLASS cl1 DEFINITION
CLASS cl1 DEFINITION.
PUBLIC SECTION.
    METHODS:
      add,
      constructor IMPORTING v1 TYPE i
                            v2 TYPE i,
      display.
    CLASS-METHODS:
     class_constructor.
PRIVATE SECTION.
    DATA:
    w_var1   TYPE i,
    w_var2   TYPE i,
    w_var3   TYPE i,
    w_result TYPE i.
ENDCLASS.                    "cl1 DEFINITION
      CLASS cl1 IMPLEMENTATION
CLASS cl1 IMPLEMENTATION.
METHOD constructor.
    w_var1 = v1.
    w_var2 = v2.
ENDMETHOD.                    "constructor
METHOD class_constructor.
    WRITE:
    / 'Tihs is a class or static constructor.'.
ENDMETHOD.                    "class_constructor
METHOD add.
    w_result = w_var1 + w_var2.
ENDMETHOD.                    "add
METHOD display.
    WRITE:
    /'The result is = ',w_result.
ENDMETHOD.                    "display
endclass.
" Main program----
data:
ref1 type ref to cl1.
parameters:
w_var1 type i,
w_var2 type i.
start-of-selection.
create object ref1 exporting v1 = w_var1
                              v2 = w_var2.
   ref1->add( ).
   ref1->d isplay( ).
Regards,
Anirban Bhattacharjee

Passing params to php constructor?

it is possible to pass parameters to php constructor via "data/services" in flex?

Thanks for that suggestion, that'll be a good project for me to learn tags.
What's buggin me is why isn't that supported...there must be a good reason for it, it's not like the geniuses at Sun just didn't think of it!
In the mean time I've discovered that I can just write a regular class and call it's constructor but I've got to use a conditional to avoid calling it twice. So far that class seems to have session scope by default...does anyone know how to set page or application scope to a class?
Newbieism is a challenge!
Thanks for your help,
Brad

Pass arguments in a applet

i know when you run a prog you could pass arguments, can i do with my applet.. like take a textbox in my html page?????

thx man you're nice
yes. you can do that. That is actually an <HTML>
syntax question. Following might help
<applet code="Chat" width=600 height=400>
<param name=host value="somewhere.hotwired.com">
<param name=port value="2323">and on the java side look at the APi and under Applet
class look for getParameter() method

Problems with passing arguments to app

Hi.
I have a litle problem with passing arguments. I create a dynamic jnlp file using jsp. This is my code:
<%
response.setContentType("application/x-java-jnlp-file");
String l = request.getParameter("login");
String p = request.getParameter("pass");
out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
out.println("<jnlp spec=\"1.0+\" codebase=\"http://212.244.104.27:8080/PzP_INSTALL/\" href=\"pzp.jsp\">");
out.println("<information>");
out.println("<title>xxx</title>");
out.println("<vendor>xxxx</vendor>");
out.println("<homepage href=\"main.jsp\"/>");
out.println("<description>text</description>");
out.println("<offline-allowed/>");
out.println("</information>");
out.println("<security>");
out.println("<all-permissions/>");
out.println("</security>");
out.println("<resources>");
out.println("<j2se version=\"1.4+\"/>");
out.println("<jar href=\"jars/pzp.jar\" main=\"true\" download=\"eager\"/>");
out.println("<jar href=\"jars/config.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/commons-beanutils.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/commons-collections.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/commons-digester.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/commons-logging.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/commons-validator.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/easclient.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/easj2ee.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/jakarta-oro-2.0.7.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/jbcl.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/log4j-1.2.7.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/jdom.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jars/xercesImpl.jar\" main=\"false\" download=\"eager\"/>");
out.println("<property name =\"javaws.login \" " + "value=" + "\"" + l + "\"" + "/>");
out.println("<property name =\"javaws.pass \" " + "value=" + "\"" + p + "\"" + "/>");
out.println("</resources>");
out.println("<application-desc main-class=\"aaa.bbb.ccc.MyClass\"/>");
out.println("</jnlp>");
%>My problem is when i have the href tag filled, the arguments that i passed equlas null, when i remove the href everything is ok besides that the app doesnt show in application manager and doesnt create an icon on the desktop.
out.println("<jnlp spec=\"1.0+\" codebase=\"http://62.89.104.27:8080/PzP_INSTALL/\" href=\"pzp.jsp\">");
Any help would be appreciated.

Hello again.
Thanks for your replay but unfortunetly it doesnt work too :-(
I've tried to use the out.println statemants in the servlet instead of using a jsp page but the error is the same. Please look at my code and tell me if you can what could be wrong.
This is the error message:
An error occurred while launching/running the application.
Title: PZP
Vendor: SPEED
Category: Download Error
Unable to load resource: http://212.89.104.27:8080/PzP_INSTALL/ServletPZP
Servlet code.
package pzp_install;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import pzp_install.LoginBean;
import javax.swing.JOptionPane;
public class ServletPZP extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
config.getServletContext().setAttribute("ServletPZP", this);
public void doPost(HttpServletRequest request, HttpServletResponse resp)
throws IOException {
PrintWriter out = resp.getWriter();
// Get the value of the request parameter
String login = request.getParameter("login");
String pass = request.getParameter("pass");
resp.setContentType("application/x-java-jnlp-file");
out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
out.println("<jnlp spec=\"1.0+\" codebase=\"http://212.89.104.27:8080/PzP_INSTALL/\" href=\"/servletpzp\">");
out.println("<information>");
out.println("<title>PZP</title>");
out.println("<vendor>SPEED</vendor>");
out.println("<homepage href=\"main.jsp\"/>");
out.println("<description>Aplikacja wspomagajaca zarzadzanie zleceniami</description>");
out.println("<offline-allowed/>");
out.println("</information>");
out.println("<security>");
out.println("<all-permissions/>");
out.println("</security>");
out.println("<resources>");
out.println("<j2se version=\"1.4+\"/>");
out.println("<jar href=\"pzp.jar\" main=\"true\" download=\"eager\"/>");
out.println("<jar href=\"config.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"commons-beanutils.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"commons-collections.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"commons-digester.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"commons-logging.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"commons-validator.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"easclient.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"easj2ee.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jakarta-oro-2.0.7.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jbcl.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"log4j-1.2.7.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"jdom.jar\" main=\"false\" download=\"eager\"/>");
out.println("<jar href=\"xercesImpl.jar\" main=\"false\" download=\"eager\"/>");
out.println("<property name =\"javaws.login \" " + "value=" + "\"" + login + "\"" + "/>");
out.println("<property name =\"javaws.pass \" " + "value=" + "\"" + pass + "\"" + "/>");
out.println("</resources>");
out.println("<application-desc main-class=\"pl.speednet.pzp.PzP\"/>");
out.println("</jnlp>");
public void destroy() {
super.destroy();
This is the brief of code which starts the servlet
<form action="http://212.89.104.27:8080/PzP_INSTALL/servletpzp" method="post">
<input type="hide" name="login" value=<%=l%>>
<input type="hide" name="pass" value=<%=p%>>
<input type=submit value=Start PZP>
</form>
This is the web.xml file code.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
    <servlet-name>ServletPZP</servlet-name>
    <servlet-class>pzp_install.ServletPZP</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ServletPZP</servlet-name>
    <url-pattern>/servletpzp</url-pattern>
</servlet-mapping>
<mime-mapping>
    <extension>jar</extension>
    <mime-type>application/x-java-archive</mime-type>
</mime-mapping>
<mime-mapping>
    <extension>jnlp</extension>
    <mime-type>application/x-java-jnlp-file</mime-type>
</mime-mapping>
</web-app>

Passing arguments

Our teacher just taught us about methods and passing arguments, etc. I have been over our text book and I don't quite understand how it works. Any help?
PROBLEM:
?     Write a program with four methods. One is the main method. The other three are named startMessage, message, and finishMessage.
?     Within the startMessage method, place code to print out the message ?The program has started.?
?     Within the message method, place code to print out any message that is passed, as a String, into the method using a String parameter named output.
?     Within the finishMessage method, place code to print out the message ?The program is done.?
?     When the program begins call the startMessage method.
?     Then display the following dialog box:
"Enter a message:"
?     Using a While loop, respond to the user?s input appropriately:
     If the user presses OK display whatever the user has entered by calling the message method with the user?s input as the argument. Continue to display the dialog box and display the user?s input until they press Cancel.
     When the user presses Cancel stop showing the dialog box, and do not display what the user has entered.
?     After the user presses Cancel, and before the program terminates, call the finishMessage method.
?     Terminate the program.
here is what I have so far:
public static void main(String[] args) {
          startMessage();
          String userMessage = JOptionPane.showInputDialog("Enter a message:");
          while (userMessage != null){
               message(userMessage);
               JOptionPane.showMessageDialog(null, "Here is message" + message());
               userMessage = JOptionPane.showInputDialog("Enter a message:");
          finishMessage();
          System.exit(0);
     public static void startMessage(){
          JOptionPane.showMessageDialog(null, "The program has started.");
     public static String message (String output){
          output = userMessage;
          return(output);
     public static void finishMessage(){
          JOptionPane.showMessageDialog(null, "The program is done.");
}what's giving me the problem is the message method; I can't figure out how to pass whatever they put in the userMessage variable to the message method

I am stuck here
PROBLEM:
?     Change your C6E2 class by adding a new method called getNumberInput. This method will be used to get a number input from the user, replacing the lines of code in the main method that were previously used. You will need to call this method twice from the main method, prompting for the first and second numbers in turn.
?     Write the method so that the prompt displayed in the input dialog box is passed through an argument.
?     The return type of this new method will be a double.
I can't figure out how to pass the input paramater correctly, any help?
public static void main(String[] args) {
          double num1 = 0;
          double num2 = 0;
          double addResult = 0;
          double subtractResult = 0;
          double multiplyResult = 0;
          double divideResult = 0;
          double input1 = getNumberInput(num1);//this is where I am stuck
          double input2 = getNumberInput(num2);
          addResult = add(num1, num2);
          subtractResult = subtract(num1, num2);
          multiplyResult = multiply(num1, num2);
          divideResult = divide(num1, num2);
          JOptionPane.showMessageDialog(null, addResult);
          JOptionPane.showMessageDialog(null, subtractResult);
          JOptionPane.showMessageDialog(null, multiplyResult);
          JOptionPane.showMessageDialog(null, divideResult);
          System.exit(0);
     }//main
     public static double getNumberInput (double input){
          double output = 0;
          Double.parseDouble(JOptionPane.showInputDialog("Enter a number:"));
          return output;
     public static double add (double term1, double term2){
          double result = term1 + term2;
          return result;
     }//add
     public static double subtract (double term1, double term2){
          double result = term1 - term2;
          return result;
     }//subtract
     public static double multiply (double term1, double term2){
          double result = term1 * term2;
          return result;
     }//multiply
     public static double divide (double term1, double term2){
          double result = term1 / term2;
          return result;
     }//divide
}//class

Pass arguments to class constructor

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