Need to resize window to show all components !!

Question

I created a simple java application but there is a wiered problem. Unless i resize or maximise the window, I am unable to see any component I added into it. What is the problem with my code.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class CdApp implements ActionListener
     //Frame and Panel:-     
     JFrame cdFrame;
     JPanel cdPanel;
     static PreparedStatement val;
     static ResultSet result;
     int flag;
     //Buttons:-
     // Labels :-
     // Text Fields & Areas:-
     // Strings :-
     // Misc Components:-
     // The MainMethod :-
     public static void main(String[] args)
          CdApp cd_object1 = new CdApp();
          cd_object1.main_page();          
     // Methods:-
     // Main Page:-
     void main_page()
          cdPanel = new JPanel();
          cdFrame = new JFrame("CD Catalog Manager ===> Sukrit Mehra!!");
          cdFrame.setSize(800,600);
          cdFrame.setVisible(true);
          cdFrame.getContentPane().add(cdPanel);
          cdFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    

Answer 1

can you cut and paste verbetim the following code into a CdApp.java file and compile it and run it and see if you can see a window 800x600 that displays "Hello I'm a JTextArea!" in the top middle to see if it displays without resizing?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class CdApp implements ActionListener{
     JFrame cdFrame;
     JPanel cdPanel;
        JTextArea jta;
        public static void main(String[] args){
            CdApp cd_object1 = new CdApp();
            cd_object1.main_page();
     void main_page(){
            cdPanel = new JPanel();
            cdPanel.add(new JTextArea("Hi I'm a JTextArea!"));
            cdFrame = new JFrame("CD Catalog Manager ===> Sukrit Mehra!!");
            cdFrame.setSize(800,600);                       
            cdFrame.getContentPane().add(cdPanel);
            cdFrame.setVisible(true);                       
            cdFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        public void actionPerformed(ActionEvent ae){       
}