How to make my program work using 2 files separately?

Question

My main file is ExpenseTracker.java. When u
compile the ExpenseTracker.java , there is a column of buttons on the left
and a right box. I would like to make the output of the RecordMenu.java
appear(not pop out) in the right box of my ExoenseTracker when i click one
of the button 'Record Expenses'. I wonder you can help me in this? I am
facing that problem right now.=======================================================================
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class ExpenseTracker extends JFrame {
public ExpenseTracker() {
super("Expense Tracker");
// FirstPanel
JPanel FirstPanel = new JPanel();
FirstPanel.setLayout(null);
JLabel labeltracker = new JLabel("Expense Tracker");
JButton recordExpenses = new JButton("Record Expenses");
JButton viewExpenses = new JButton("View Expenses");
JButton calendar = new JButton("Calendar" );
JButton exit = new JButton("Exit");
labeltracker.setBounds(40,120,135,30);
recordExpenses.setBounds(25,160,135,30);
viewExpenses.setBounds(25,210,135,30);
calendar.setBounds(25,260,135,30);
exit.setBounds(25,310,135,30);
FirstPanel.setBounds(5,5,200,500);
FirstPanel.add(labeltracker);
FirstPanel.add(recordExpenses);
FirstPanel.add(viewExpenses);
FirstPanel.add(calendar);
FirstPanel.add(exit);
//SecondPanel
JPanel SecondPanel = new JPanel();
SecondPanel.setLayout(new BorderLayout(1,2));
// SecondPanel.setBorder(new BevelBorder(BevelBorder.LOWERED));
SecondPanel.setBorder(new LineBorder(Color.black));
SecondPanel.setBounds(210,120,530,270);
getContentPane().setLayout(null);
getContentPane().add(FirstPanel);
getContentPane().add(SecondPanel);
setSize(800,500);
setVisible(true);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
public static void main(String [] args) {
new ExpenseTracker();
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class RecordMenu extends JFrame implements ItemListener,ActionListener {
>>
JCheckBox weekly;
JCheckBox monthly;
public RecordMenu() {
super("Choose");
Container c = getContentPane();
JPanel checkPanel = new JPanel();
checkPanel.setLayout(new GridLayout(4,2));
checkPanel.setBorder(new TitledBorder("Record Expenses"));
JLabel label2 = new JLabel("Amount to track:");
JTextField amtField = new JTextField(5);
//Create the check boxes.
weekly = new JCheckBox("Weekly");
weekly.setSelected(false);
monthly = new JCheckBox("Monthly");
monthly.setSelected(false);
//Register a listener for the check boxes.
weekly.addItemListener(this);
monthly.addItemListener(this);
amtField.addActionListener(this);
//Put the check boxes in a column in a panel
checkPanel.add(weekly,BorderLayout.NORTH);
checkPanel.add(monthly,BorderLayout.SOUTH);
checkPanel.add(label2);
checkPanel.add(amtField);
JPanel buttonPanel = new JPanel();
JButton buttonOk = new JButton("OK");
JButton buttonCancel = new JButton("Cancel");
buttonPanel.add(buttonOk);
buttonPanel.add(buttonCancel);
c.add(checkPanel,BorderLayout.NORTH);
c.add(buttonPanel);
setSize(370,200);
setVisible(true);
/** Listens to the check boxes. */
public void itemStateChanged(ItemEvent event) {
public static void main(String[] args) {
new RecordMenu();

Answer 1

but i wan e program to work wit 2 file, not all e 2 file codes put together in a file. I wonder if can call e code from the recordmenu file when i execute the expenseTracker file. I not sure i explain this way u will understand?
When the record menu 'ok' is clicked there will b a JOptionpane tat will pop out saying
'Total amt to b tracked on a weekly basis is (amt entered in textfield)"
if e checkbox is selected weekly, the output will be like e above
otherwise it will display 'Total amt to b tracked on a monthly basis is (amt entered in textfield)".
ya e textfield input must be numbers.