Java, Checking numbers in a text field

[bull3tmagn3t]

This was for school, and now I want to try and check the string in the TextField against another string, to see if it is the same or not, What should I do? do i need global variables or something?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SINProgram{
 public static void main(String args[]){
  JFrame frame;
  Container c;
  frame=new JFrame("SIN Program");
  c=frame.getContentPane();
 
  c.setLayout(new FlowLayout());
 
  JTextField tfSIN=new JTextField(13);
 
  JLabel lblSIN=new JLabel ("Enter your SIN number");
  JLabel lblOutput=new JLabel("");
 
  JButton buttonCheckSIN=new JButton("Check SIN");
 
  c.add(tfSIN);
  c.add(lblSIN);
  c.add(buttonCheckSIN);
  c.add(lblOutput);
 
  MyButtonListener mbl = new MyButtonListener (tfSIN,lblOutput);
 
  buttonCheckSIN.addActionListener(mbl);
 
  frame.setSize(500,100);
  frame.setVisible(true);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }//end main
}//end class

And the listener:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MyButtonListener implements ActionListener{
 JTextField tf;
 JLabel l;
 
 MyButtonListener(JTextField tfNumber, JLabel lblMsg){
  tf=tfNumber;
  l=lblMsg;
 }
 public void actionPerformed (ActionEvent e){
  l.setText("Hello");
 }
}//end class

[dag10]

if (textBoxA.getText().equals(textBoxB.getText())) {
	// stuffz
}