How to call this out by clicking button from other file??

Question

The following coding is easy and workable...!! i wonder how do i call this out by clicking button from other file... please help!!
import java.awt.geom.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.print.PrinterJob;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.awt.print.*;
public class Receipt extends JPanel implements Printable, ActionListener {
final static Color bg = Color.white;
final static Color fg = Color.black;
final static Color red = Color.red;
final static Color white = Color.white;
final static BasicStroke stroke = new BasicStroke(2.0f);
final static BasicStroke wideStroke = new BasicStroke(8.0f);
final static float dash1[] = {10.0f};
final static BasicStroke dashed = new BasicStroke(1.0f,
BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER,
10.0f, dash1, 0.0f);
final static JButton button = new JButton("Print");
public Receipt() {
     setBackground(bg);
button.addActionListener(this);
public void actionPerformed(ActionEvent e) {
if (e.getSource() instanceof JButton) {  
PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(this);
if (printJob.printDialog()) {
try {
printJob.print();
catch (Exception ex) {
ex.printStackTrace();
public void paintComponent(Graphics g) {
     super.paintComponent(g);
     Graphics2D g2 = (Graphics2D) g;
     drawShapes(g2);
public void drawShapes(Graphics2D g2){
g2.drawString("Hello world",50,50);
public int print(Graphics g, PageFormat pf, int pi) throws PrinterException {
if (pi >= 1) {
return Printable.NO_SUCH_PAGE;
     drawShapes((Graphics2D) g);
return Printable.PAGE_EXISTS;
public static void main(String s[]){
     JFrame f = new JFrame();
     JPanel panel = new JPanel();
     panel.add(button);
     f.getContentPane().add(BorderLayout.SOUTH, panel);
     f.getContentPane().add(BorderLayout.CENTER, new Receipt());
     f.setSize(580, 500);
     f.show();

Answer 1

The following coding is easy and workable...!! i wonder how do i call
this out by clicking button from other file... please help!!Copy the code from your main() method and put it into the actionPerformed() method of the other class. If you do not need to reference the instance of Receipt from the othe class, it is that easy.