JTextArea

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kittisay java");

        setLayout(null);

        // TextArea

        final JTextArea textArea = new JTextArea();

        textArea.setBounds(76, 11, 191, 50);

        add(textArea);

        // Label

        final JLabel lbl = new JLabel("Result");

        lbl.setBounds(103, 120, 144, 14);

        add(lbl);

        // Button

        JButton btn1 = new JButton("Button 1");

        btn1.addActionListener((e) -> {

            lbl.setText("Hello : " + textArea.getText());

        });

        btn1.setBounds(128, 72, 99, 23);

        add(btn1);

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }

ເພີ່ມ Jscrollbar ກັບ JTextArea

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kittisay Java");

        setLayout(null);

        // TextArea

        JTextArea textArea = new JTextArea();

        // ScrollPane

        JScrollPane scroll = new JScrollPane(textArea);

        scroll.setBounds(100, 52, 130, 50);

        add(scroll);

        // Label

        JLabel lbl = new JLabel("Result");

        lbl.setBounds(107, 170, 144, 14);

        add(lbl);

        // Button

        JButton btn1 = new JButton("Button 1");

        btn1.addActionListener((e) -> {

            lbl.setText("Hello : " + textArea.getText());

        });

        btn1.setBounds(119, 129, 99, 23);

        add(btn1);

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }