JTextField Fixed Height

Question

How do I get the JTextField to have a fixed height when the Frame is maximized? I want it to look sort of similar to the Skype application on Ubuntu.

private JTextField username;
private JPasswordField password;
private JLabel usernamelabel;
private JLabel passwordlabel;
public LoginPanel(){


    setSize(200,200);
    setLayout(new GridLayout(4,4));
    setBackground(new Color(85,153,187));
    setBorder(BorderFactory.createEmptyBorder(70, 70, 70, 70));
    username = new JTextField();
    password = new JPasswordField();
    usernamelabel= new JLabel("Username");
    passwordlabel= new JLabel("Password");
    username.setBounds(5, 5, 100, 100);
    username.setPreferredSize(new Dimension(80,20));
    password.setPreferredSize(new Dimension(80,20));
    add(usernamelabel);
    add(username);
    add(passwordlabel);
    add(password);

Answer 1

I think this solves your problem.

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main { 

/**
 * @param args
 */
public static void main(String[] args) {
    JFrame failFrame = new JFrame();
    JPanel mainPanel = new JPanel();
    mainPanel.setLayout(new GridLayout(0, 4));

    JPanel leftTextFieldPanel = new JPanel();
    leftTextFieldPanel.setLayout(new FlowLayout());        
    JPanel rightTextFieldPanel = new JPanel();
    rightTextFieldPanel.setLayout(new FlowLayout());

    JTextField leftTextField = new JTextField();
    leftTextField.setPreferredSize(new Dimension(150,20));              
    JTextField rightTextField = new JTextField();
    rightTextField.setPreferredSize(new Dimension(150,20));

    leftTextFieldPanel.add(leftTextField);
    mainPanel.add(leftTextFieldPanel);

    rightTextFieldPanel.add(rightTextField);
    mainPanel.add(rightTextFieldPanel);

    mainPanel.add(new JPanel());
    mainPanel.add(rightTextFieldPanel);
    mainPanel.add(new JPanel());

    failFrame.add(mainPanel);
    failFrame.setSize(600, 400);
    failFrame.setLocationRelativeTo(null);
    failFrame.setVisible(true);
}
}

I used nested Layouts. On the Top is your GridLayout and the textfields are in a FlowLayout which are added on the gridLayout panel. So the textfields are no longer stretched.