// Example with TextArea and KeyListener to process input

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

class text_stuff extends JFrame
implements ActionListener
{
  private JTextArea area;
  private JTextField name, ssn;
  private JButton showButton;
  public text_stuff ()
  {
    area = new JTextArea(5, 30);
    area.setEditable(false);
    JScrollPane sp = new JScrollPane(area);
    sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
    sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    name = new JTextField(15);
    ssn = new JTextField(15);
    showButton = new JButton("Show");

    Container c = getContentPane();

    Panel p = new Panel();
    p.setLayout(new GridLayout(2,2));
    p.add(new JLabel("NAME:"));
    p.add(name);
    p.add(new JLabel("SSN:"));
    p.add(ssn);

    c.add(sp, BorderLayout.NORTH);
    c.add(p, BorderLayout.CENTER);
    c.add(showButton, BorderLayout.SOUTH);

    showButton.addActionListener(this);
    name.addActionListener(this);
    ssn.addActionListener(this);
    ssn.addKeyListener(new text_handler());
		      
  }

  class text_handler extends KeyAdapter
  {

    public void keyTyped (KeyEvent k)
    {
      if (k.getSource() != ssn) return;
      char inchar = k.getKeyChar();
      if (!(inchar >= '0' && inchar <= '9'))
	{
	  JOptionPane.showMessageDialog(null, "NON-NUMERIC INPUT: " + inchar);
	  k.setKeyChar('\0');
	}

    }
  }
  public void actionPerformed(ActionEvent a)
  {
    if (a.getSource() == name)
      {
	String input = a.getActionCommand();
	JOptionPane.showMessageDialog(this, "Upon <return> NAME: " + input);
      }
    else if (a.getSource() == ssn)
      {
	String input = a.getActionCommand();
	JOptionPane.showMessageDialog(this, "Upon <return> SSN: " + input);
      }
    else if (a.getSource() == showButton)
      {
	area.append("Name: " + name.getText() +
				      " ; SSN: " + ssn.getText() + "\n");
      }
  }
  public static void main (String args[])
  {
    text_stuff ts = new text_stuff();
    ts.setLocation(100,100);
    ts.setSize(225,300);
    ts.show();
  }
}