Passing Arguments in a Multiple JFrame project

Question

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();
        getContentPane().add( button );
        setDefaultCloseOperation( DISPOSE_ON_CLOSE );
        pack();
        show();
    public static void main( String[] args ) {
        SubApp app = new SubApp();
}

Answer 1

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