The Frame Is Empty I Donot Know Why ?

المشكلة كان لديك سطر ناقص

ووضعت لك تعليق فوقه

//this is your missing line

 

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class SummaryFrame extends JFrame implements ActionListener {
    private RandomAccessFile raf;
    private JTabbedPane jtbSummaryInfo = new JTabbedPane();
    private JTextField jtfNumber, jtfNumTicketSold, jtfNumRemaining, jtfRevenue;
    private JButton jbtOk, jbtFindSummary;

    public SummaryFrame(RandomAccessFile raf) {
        this.raf = raf;

        setTitle("Summary information");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);

        JTabbedPane jtbSummuryInfo = new JTabbedPane();
        JPanel A1 = new JPanel();
        A1.setLayout(new BorderLayout());

        JPanel A2 = new JPanel();
        A2.setLayout(new BorderLayout());

        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(3, 1));
        p1.add(new JLabel("Number of Tickets"));
        p1.add(new JLabel("Number Ticket Sold"));
        p1.add(new JLabel("Number Remaining Ticket"));

        JPanel p2 = new JPanel();
        p2.setLayout(new GridLayout(3, 1));
        p2.add(jtfNumber = new JTextField());
        p2.add(jtfNumTicketSold = new JTextField());
        p2.add(jtfNumRemaining = new JTextField());

        JPanel p3 = new JPanel();
        p3.setLayout(new BorderLayout());
        p3.add(p1, BorderLayout.WEST);
        p3.add(p2, BorderLayout.CENTER);

        JPanel jpButton = new JPanel();
        jpButton.setLayout(new FlowLayout());
        jpButton.add(jbtOk = new JButton("ok"));
        jpButton.add(jbtFindSummary = new JButton("Find suumury"));

        JPanel p4 = new JPanel();
        p4.setLayout(new FlowLayout());
        p4.add(new JLabel("Revenue"));
        p4.add(jtfRevenue = new JTextField());

        JPanel p5 = new JPanel();
        p5.setLayout(new FlowLayout());
        p5.add(jbtOk = new JButton("ok"));
        p5.add(jbtFindSummary = new JButton("Find suumury"));

        A1.add(p3, BorderLayout.CENTER);
        A1.add(jpButton, BorderLayout.SOUTH);

        A2.add(p4, BorderLayout.CENTER);
        A2.add(p5, BorderLayout.SOUTH);

        jtbSummaryInfo.add(A1, "Ticket");

        jtbSummaryInfo.add(A2, "Income");

        Container c = getContentPane();
        c.setLayout(new BorderLayout());
        c.add(jtbSummuryInfo, BorderLayout.CENTER);

        jtfRevenue.setEditable(false);
        jbtFindSummary.addActionListener(this);

        //this is your missing line
        this.getContentPane().add(jtbSummaryInfo);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == jbtFindSummary) {
            try {
                raf.seek(0);
            } catch (IOException ex) {
                System.out.println("error");
            }
        }
    }

    public static void main(String[] args) {
        SummaryFrame t = new SummaryFrame(null);

    }
}