TextComponentFrame.java

package text;

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

/**
 * A frame with sample text components.
 */
public class TextComponentFrame extends JFrame {
    public static final int TEXTAREA_ROWS = 8;
    public static final int TEXTAREA_COLUMNS = 20;

    public TextComponentFrame() {
        JTextField textField = new JTextField();
        JPasswordField passwordField = new JPasswordField();

        JPanel northPanel = new JPanel();
        northPanel.setLayout(new GridLayout(2, 2));
        northPanel.add(new JLabel("User name: ", SwingConstants.RIGHT));
        northPanel.add(textField);
        northPanel.add(new JLabel("Password: ", SwingConstants.RIGHT));
        northPanel.add(passwordField);

        add(northPanel, BorderLayout.NORTH);

        JTextArea textArea = new JTextArea(TEXTAREA_ROWS, TEXTAREA_COLUMNS);
        JScrollPane scrollPane = new JScrollPane(textArea);

        add(scrollPane, BorderLayout.CENTER);

        // add button to append text into the text area

        JPanel southPanel = new JPanel();

        JButton insertButton = new JButton("Insert");
        southPanel.add(insertButton);
        insertButton.addActionListener(e ->
                textArea.append("User name: " + textField.getText() +
                        " Password: " + new String(passwordField.getPassword()) +
                        "\n"));

        add(southPanel, BorderLayout.SOUTH);
        pack();
    }
}