centering/sizing fields on a panel

I am having a hard time getting my text field and password fields to size correctly and to appear in the middle of the screen. Any help?

Code:

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

public class LoginScreen extends JFrame
{
        public static void main(String[] args) {
                new LoginScreen();
        }
       
        public LoginScreen() {
                 
            super("Log-In");
            this.setDefaultCloseOperation(super.EXIT_ON_CLOSE);
       
            Container content = getContentPane();
            content.setPreferredSize(new Dimension(400,200));
            content.setBackground(Color.black);
            content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
            content.add(Box.createRigidArea(new Dimension(0,100)));
           
            JFormattedTextField user = new JFormattedTextField();
            JPasswordField pword = new JPasswordField();
                               
            content.add(user, BorderLayout.PAGE_START);
            user.setSize(5,2);
         
            content.add(Box.createRigidArea(new Dimension(0,30)));
            content.add(pword, BorderLayout.PAGE_START);
            pword.setSize(5,2);
                     
            pack();       
            setVisible(true);
        }
       
       
                       
}

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Hi,

first I would put this after setDefaultCloseOperation():

Code:

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this.setLocationRelativeTo(null);

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so your JFrame will be placed in the middle of you screen.
And for the textfield itself I would use the GridLayout(int rows,int columns);
In that way you don't have to place the size. All component will have the same size and would be allign.