Making JTextFields look "good"

Question

sup, I cant seem to get my JTextFields to be displayed at the right height(as tall as the characters) in ANY window size.... what layout should I use?
thanks
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener {
private static final int WIDTH = 300;
private static final int HEIGHT = 200;
private static final int CHAR_PER_LINE = 10;
private JTextField text1, text2, result;
public static void main(String[] args) {
Calculator demo = new Calculator();
demo.setVisible(true);
public Calculator() {
setSize(WIDTH, HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Calculator");
Container content = getContentPane();
content.setLayout(new GridLayout(3, 1));
JPanel row1 = new JPanel();
row1.setLayout(new BoxLayout(row1, BoxLayout.X_AXIS));
JLabel label1 = new JLabel("Number 1:");
row1.add(label1);
text1 = new JTextField(CHAR_PER_LINE);
row1.add(text1);
content.add(row1);
JPanel row2 = new JPanel();
row2.setLayout(new BoxLayout(row2, BoxLayout.X_AXIS));
JLabel label2 = new JLabel("Number 2:");
row2.add(label2);
text2 = new JTextField(CHAR_PER_LINE);
row2.add(text2);
content.add(row2);
JPanel row3 = new JPanel();
row3.setLayout(new BoxLayout(row3, BoxLayout.X_AXIS));
JLabel label3 = new JLabel("Result:");
row3.add(label3);
result = new JTextField(CHAR_PER_LINE);
row3.add(result);
content.add(row3);
JMenu operMenu = new JMenu("Oper");
JMenuItem m;
m = new JMenuItem("Add");
m.addActionListener(this);
operMenu.add(m);
m = new JMenuItem("Sub");
m.addActionListener(this);
operMenu.add(m);
JMenuBar mBar = new JMenuBar();
mBar.add(operMenu);
setJMenuBar(mBar);
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
int number1 = Integer.parseInt(text1.getText().trim());
int number2 = Integer.parseInt(text2.getText().trim());
if (command.equalsIgnoreCase("Add"))
result.setText(Integer.toString(number1 + number2));
else if (command.equalsIgnoreCase("Sub"))
result.setText(Integer.toString(number1 - number2));
else
result.setText("Error in GUI");
}

Answer 1

BoxLayout is a good choice, but insert glue before and after your items like
row1.add(Box.createHorizontalGlue());
This will eat up any space beyond the controls preferred width.
or if it's the height thats a problem, change the content's layout to BoxLayout, and insert
content.add(Box.createVerticalGlue());
to eat up extra vertical space beyond the control's preferred height.
i find that a combination of Border and Box layouts will get you what you want 99% of the time.