Last problem in my project!!

Question

i've intend to open this 'Receipt.class' by clicking button from other class file called 'Main.class'
Normally we used this statement "Receipt open = new Receipt();" to open,
but what if the class file is like that??
Please help me even giving me the clues!! please.. this is my last problem in my project!!!
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 JButton button = new JButton("Print");
public Receipt() {
     setBackground(Color.white);
button.addActionListener(this);
init();
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 void init{
     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

I don't quite get your question. What did you mean by open? Did you mean to display it. Receipt is a JPanel, to show it you need to have it inside a Frame or an Applet or some sort of container.
try this
import javax.swing.*;
Receipt receipt = new Receipt();
JFrame aFrame = new JFrame("Display Receipt Panel"); //create a JFrame
aFrame.getContentPane().setLayout(new BorderLayout()); //set Layout Manager for the frame
aFrame.getContentPane().add(receipt, BorderLayout.CENTER); //add panel to the frame
aFrame.show(); //show the frameThe above block of codes create a JFrame and add the Receipt panel to the Frame. Then call the Frame to show. You can put this code in a method, if you need to use this Frame and panel again, make them instance variables rather than local variables.