Passing Variables from One Class to Another

Hello, I am new to Java Programming and I'm currently starting off by trying to build a simple application.
I need help to pass variables created in one class to another.
In my source package, I created 2 java classes.
1. Main.java
2. InputFileDeclared.java
InputFileDeclared reads numerical data from an external text file and store them as string variables within the main method while Main converts a text string into a number.
Hence, I would like to pass these strings variables from the InputFileDeclared class to the Main class so that they can be converted into numbers.
I hope somebody out there may enlighten me on this.
Thank you very much in advance!

Values are passed from method to method, rather than from class to class. In a case such as you describe the code of a method in Main will probably call a method in InputFileDeclared which will return the String you want. The method in Main stores that in a local variable and processes it. It really doesn't matter here which class the method is in.
You InputFileDeclared object probably contains "state" information in its fields such as the details of the file it's reading and how far it's got, but generally the calling method in Main won't need to know about this state, just the last data read.
So the sequence in the method in Main will be:
1) Create an new instance of InputFileDeclared, probably passing it the file path etc..
2) Repeatedly call a method on that instance to return data values, until the method signals that it's reached the end of file, e.g. by returning a null String.
3) Probably call a "close()" method on the instance, which you should have written to close the file.

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How to pass a variable from one class to another class?

Hi,
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elaine_g wrote:
I am wondering why does (r.a) give an error outside the method? What's the reason it only works when used inside the (b/r.a) maths function? This is illegal syntax:
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Message was edited by:
snipered2003
Message was edited by:
snipered2003

Hi snipered2003
I'm fairly new to java, so check out anything I say.
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You may need something like    public RowSet openConnection()
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Passing a variable from one class to another

Hello:
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Here is what I am trying to do:
This piece of code - creates a window with a simple textbox on it to enter a word...
The button then calls another class file to open a new window...
All I want to do is to take the word from the text box and print it in the new window....
The first .java file I have is this:
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class FrontPageGUI extends JFrame implements ActionListener
     //declare all instance variables for THIS per class
          JLabel lblInfoOne;
          JLabel lblButtonPopUp;
          JTextField txtName;
          JButton close;
          JButton popUp;
     public FrontPageGUI()
          //set characteristics of the JFrame object
          super("Title Bar");
          setSize(600,600);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setVisible(true);
          //we need to define a Container to place objects onto the frame - this is inside the JFrame Object Above
          Container ca = getContentPane( );
          ca.setSize(600,600);
          ca.setBackground(Color.white);
          ca.setLayout(null);
          //define all other objects and set thier characteristics
          lblInfoOne     = new JLabel("Enter a word in the box above to send:");
          lblButtonPopUp = new JLabel("Click Here:");
          txtName          = new JTextField("");
          //create Button components
          close = new JButton("Close");
          popUp = new JButton("Click Me");
          //now add all objects to the container
          //Labels
          addXY(ca,lblInfoOne, 30, 160, 550,45);
          addXY(ca,lblButtonPopUp, 30, 210, 550,45);
          //TextField
          addXY(ca,txtName, 120, 100, 200,30);
          //Buttons
          addButtonXY(ca, popUp, 30, 260, 200, 45);
          addButtonXY(ca, close, 30, 310, 80, 30);
          // add the Container to the Frame
          setContentPane(ca);
     void addButtonXY(Container c, JButton cp, int x, int y, int w, int h)
           cp.setBounds(x,y,w,h);
           cp.addActionListener(this);
           c.add(cp);
     void addXY(Container c, Component cp, int x, int y, int w, int h)
           cp.setBounds(x,y,w,h);
           c.add(cp);
     public void actionPerformed(ActionEvent event)
          if (event.getSource()== popUp)
               //This is WHERE THE PROBLEM IS...
               //Here I want to send to contents of the textfield - txtName
               String temp = txtName.getText();
               new PopUpGUI(temp);
          if (event.getSource()==close)
               closeUp();
     void closeUp()
          System.exit(0);
          //dispose();
//we need a driver program - this is the only time MAIN is used.
public class FrontPage
     //create an instance of the GUI and showit
     public static void main(String args [])
          new FrontPageGUI();
               The second .java file I have is this:
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class PopUpGUI extends JFrame implements ActionListener
     //declare all instance variables ie per class
          JLabel headerLabel;
          JLabel sentLabel;
          JButton close;
     public PopUpGUI(String Sent)
          //set characteristics of the JFrame object
          super("Pop Up Window");
          setSize(320,450);
          setVisible(true);
          //need to define a Container to place objects onto the frame
          Container ca = getContentPane( );
          ca.setSize(320,450);
          ca.setLayout(null);
          //define all other objects and set characteristics
          headerLabel = new JLabel("New Window!"); //heading label
          sentLabel = new JLabel(Sent);
          close = new JButton("Close");
          //now add all objects to the container
          addXY(ca,headerLabel,10,10,380,80);
          addXY(ca,sentLabel,10,100,380,80);
          addButtonXY(ca, close, 50, 200, 100, 30); //Bottom Left
          // add the Container to the Frame
          setContentPane(ca);
     //We need these 2 methods - EVERY TIME
     void addButtonXY(Container c, JButton cp, int x, int y, int w, int h)
           cp.setBounds(x,y,w,h);
           cp.addActionListener(this);
           c.add(cp);
     void addXY(Container c, Component cp, int x, int y, int w, int h)
           cp.setBounds(x,y,w,h);
           c.add(cp);
     //What to do when the click happens
     public void actionPerformed(ActionEvent event)
          if (event.getSource()==close)
               dispose();
               //closeUp(); - Doesn't run CLOSEUP this time (i.e. exit program) - instead just DISPOSEs of the window
//Driver class is in FrontPage.javaThis seems to work... but is it the best way to do it????
Tony.

Well,
Using the constructor is the way to go. Otherwise create a method that takes the string as parameter.

Passing Variables from One Class to Another

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