Go4Expert - JTextField Not Displaying Properly When Backgrnd Image is set on jframe

I was making a tool in which i had to put an image as the background image and over it put some JTextField.

i have made this code:

Code:

package firstTry;



import java.awt.*;



import javax.swing.*;



public class Second extends JFrame

{

        public JPanel mainpanel = new JPanel();

        JLabel mainhead = new JLabel("Population Forecast Tool");

        

        ImageIcon back = new ImageIcon("year2.jpg");

        public JLabel backLabel = new JLabel(back);

        

        

        public Second()

        {

                        

                mainpanel.setLayout(null);

                

                mainhead.setFont(new Font("Arial", 1, 20));

                mainhead.setBounds(240,10,300,30);

                backLabel.setBounds(40,45, 627, 364);



                mainpanel.add(mainhead);

                mainpanel.add(backLabel);

                

                add(mainpanel);

                

                SecondComp obj = new SecondComp(mainpanel);

        }

        

        

        public static void main(String[] args) 

        {

                Second obj = new Second();

                

                obj.setSize(800,550);

                obj.setVisible(true);

                obj.setDefaultCloseOperation(EXIT_ON_CLOSE);

                obj.setResizable(false);

                obj.setTitle("Population Predictor");

        }



}

the JTextField are added in the SecondComp class which is:

Code:

package firstTry;



import java.awt.Color;



import javax.swing.BorderFactory;

import javax.swing.JPanel;

import javax.swing.JTextField;



public class SecondComp 

{

        JTextField firstTf = new JTextField(102);

        JTextField secondTf = new JTextField(102);

        JTextField thirdTf = new JTextField(102);

        JTextField fourthTf = new JTextField(102);

        JTextField fifthTf = new JTextField(102);

        

        

        public SecondComp(JPanel mainpanel) 

        {

                

                firstTf.setBounds(148,107,102,33);

                secondTf.setBounds(148,142,102,33);

                thirdTf.setBounds(148,177,102,33);

                fourthTf.setBounds(148,212,102,33);

                fifthTf.setBounds(148,247,102,33);

                

                firstTf.setHorizontalAlignment(JTextField.CENTER);

                firstTf.setBorder(BorderFactory.createLineBorder(Color.black));

                secondTf.setHorizontalAlignment(JTextField.CENTER);

                secondTf.setBorder(BorderFactory.createLineBorder(Color.black));

                thirdTf.setHorizontalAlignment(JTextField.CENTER);

                thirdTf.setBorder(BorderFactory.createLineBorder(Color.black));

                fourthTf.setHorizontalAlignment(JTextField.CENTER);

                fourthTf.setBorder(BorderFactory.createLineBorder(Color.black));

                fifthTf.setHorizontalAlignment(JTextField.CENTER);

                fifthTf.setBorder(BorderFactory.createLineBorder(Color.black));

                

                thirdTf.setEnabled(true);

                

                

                mainpanel.add(firstTf);

                mainpanel.add(secondTf);

                mainpanel.add(thirdTf);

                mainpanel.add(fourthTf);

                mainpanel.add(fifthTf);

        }

}

The problem is that when the image is in the background the JTextField donot appear properly. I have to press TAB key in order to enable them. You can see i had tried "thirdTf.setEnabled(true);" but it also didnt work.

PLEASE SEE THE IMAGES TO UNDERSTAND