Java Swing Example 411 TextArea And TextField

package pages;
import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;
public class page411 extends JFrame {
    private JTextField tf = new JTextField(20);    private JTextArea ta = new JTextArea(7,20);
    public page411(){
        setTitle("TextArea Example");        setDefaultCloseOperation(EXIT_ON_CLOSE);        Container c = getContentPane();        c.setLayout(new FlowLayout());
        c.add(new JLabel("Press Enter after input entry"));        c.add(tf);        c.add(new JScrollPane(ta));
        tf.addActionListener(new ActionListener() {
            @Override            public void actionPerformed(ActionEvent e) {
                JTextField t = (JTextField)e.getSource();                //getting a source to mention the object it is listening to                ta.append(t.getText() + "\n");                //t.getText gets user text input                //attaching TextField to textArea

//textField is to get an user input                t.setText("");                //removing content in TextField
            }
        });        setSize(300,300);        setVisible(true);    }

    public static void main(String [] args){
        new page411();    }
}