jtextfielddemo.java

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

/**
 * Demonstrates the component {@link JTextField}. This class extends
 * class {@link @JPanel}.
 *
 * @author author name
 * @version 1.0.0
 */
public class JTextFieldDemo extends JPanel {

    private JLabel  labelCountry;
    private JLabel  labelCapital;
    private JTextField  textFieldCountry;
    private JTextField  textFieldCapital;

    /**
     * Creates a window.
     *
     * @param args  not used.
     */
    public static void main(String[] args) {

        JFrame frame = new JFrame("JTextFieldDemo");

        frame.setContentPane(new JTextFieldDemo());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();    // Adjust the size of the window
        frame.setVisible(true);
    }

    /**
     * Creates two {@link JLabel} components and two {@link JTextField}
     * components.
     */
    public JTextFieldDemo() {

        setLayout(new GridLayout(2, 1));
        setBackground(Color.white);

        // Create the components
        labelCountry = new JLabel("Country:");
        textFieldCountry = new JTextField("Spain", 10);
        labelCapital = new JLabel("Capital:");
        textFieldCapital = new JTextField("Madrid", 10);

        // Change the colors of the text fields
        textFieldCapital.setBackground(new Color(150, 0, 0));
        textFieldCapital.setForeground(Color.white);

        // Define the text aligment
        textFieldCapital.setHorizontalAlignment(JTextField.CENTER);

        // Make the text field un-editable
        textFieldCapital.setEditable(false);

        // Add components to the container.
        JPanel panelCountry = new JPanel();

        panelCountry.setBackground(Color.white);
        panelCountry.add(labelCountry);
        panelCountry.add(textFieldCountry);
        add(panelCountry);

        JPanel panelCapital = new JPanel();

        panelCapital.setBackground(Color.white);
        panelCapital.add(labelCapital);
        panelCapital.add(textFieldCapital);
        add(panelCapital);
    }
}