This program will display receipt using read-only TextArea

ReceiptTutorial.java

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//                                                                  //
//    This program will display receipt using read-only TextArea    //
//                                                                  //
//////////////////////////////////////////////////////////////////////
package mainprogram;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class ReceiptTutorial {
  private JFrame     frame;
  private JPanel     panel;
  private JButton    btnSubmit;
  private JLabel     lbName;
  private JTextField tfInput;
  private JTextArea  taReceipt;

  // Constructor
  public ReceiptTutorial() {

    // Create label name
    lbName = new JLabel( "Name:" );
    lbName.setBounds( 10, 10, 50, 20 );

    // Create textfield to read customer's name
    tfInput = new JTextField(30);
    tfInput.setBounds( 60, 10, 240, 20 );

    // Create button to submit customer's name
    btnSubmit = new JButton( "Submit" );
    btnSubmit.addActionListener( new btnSubmitAction( this ) );
    btnSubmit.setBounds( 200, 40, 99, 20 );

    // Create text area to display receipt
    taReceipt = new JTextArea( "", 36, 5 );
    taReceipt.setEditable( false );
    taReceipt.setBounds( 10, 70, 290, 80 );
    taReceipt.setText( "-- RECEIPT --\n\n" +
                       "CUSTOMER NAME:\n\n" +
                       "-- THANK YOU! --" );

    // Create panel to hold button, textfields, label, textarea
    panel = new JPanel( null );
    panel.add( lbName );
    panel.add( btnSubmit );
    panel.add( tfInput );
    panel.add( taReceipt );
    panel.setPreferredSize( new Dimension(310, 160) );

    // Create frame which is the main window
    frame = new JFrame( "Receipt Tutorial" );
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.getContentPane().add( panel );
    frame.pack();
    frame.setVisible( true );
  }

  // Method: Get customer's name from the text field
  public String getTextFieldInput() {
    return tfInput.getText();
  }

  // Method: Set receipt's text
  public void setTextReceipt( String s ) {
    taReceipt.setText( s );
  }

  public static void main( String[] args ) {
    new ReceiptTutorial();
  }
}

class btnSubmitAction implements ActionListener {
  private ReceiptTutorial r;

  // Constructor
  public btnSubmitAction( ReceiptTutorial r ) {
    this.r = r;
  }

  @Override
  public void actionPerformed( ActionEvent e ) {
    String name = r.getTextFieldInput();
    r.setTextReceipt( "-- RECEIPT --\n\n" +
                      "CUSTOMER NAME: " + name + "\n\n" +
                      "-- THANK YOU! --" );
  }
}

Good article

it is helpful ... Great code