Java y JTextArea en el foro de Programación:

package prueba;
import java.awt.Color;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.*;
public class datosPersonales extends JFrame implements ItemListener  {
 String[] items = {"Ingeniero", "Arquitecto", "Enfermera", "Médico"};
 JPanel panel = new JPanel();
 JPanel panel2 = new JPanel();
 JLabel label1 =new JLabel("Seleccione su edad");
 JRadioButton rb1= new JRadioButton("18-20"); 
 JRadioButton rb2= new JRadioButton("21-40");
 JRadioButton rb3= new JRadioButton("41-60");
 JRadioButton rb4= new JRadioButton("60 a más");
 JLabel label2 =new JLabel("DNI");
 JTextField txt =new JTextField(10);
 JLabel label3 =new JLabel("Profesión");
 JComboBox combo = new JComboBox(items);
 JButton boton = new JButton ("Imprimir Datos");
 ButtonGroup rbg;
 
 JTextArea txtS = new JTextArea();
 public void mipanel(){
  getContentPane().setLayout(null);
  rbg = new ButtonGroup();
  rbg.add(rb1); 
  rbg.add(rb2);
  rbg.add(rb3);
  rbg.add(rb4);
  
  rb1.setBounds(10, 60, 100, 25);
  rb1.addItemListener(this);
  
  rb2.setBounds(10, 90, 100, 25);
  rb2.addItemListener(this);
  
  rb3.setBounds(10, 120, 100, 25);
  rb3.addItemListener(this);
  
  rb4.setBounds(10, 150, 100, 25);
  rb4.addItemListener(this);
  
  label1.setBounds(0, 0, 150, 50);
  
  
  panel.setLayout(null);
  panel.setBounds(0, 0, -1, 1);
  panel.setBackground(new Color(220,220,10));
  panel.add(rb1);
  panel.add(rb2);
  panel.add(rb3);
  panel.add(rb4);
  panel.add(label1);
  panel.setSize(150, 400);
  setVisible(true);
  setSize(400, 300);
  add(panel); 
  
  
  panel2.setLayout(null);
  panel2.setBackground(new Color(250,150,110));
  panel2.setBounds(125, 0, 250, 150);
  panel2.add(txtS);
  panel2.add(label2);
  panel2.add(label3);
  panel2.add(txt);
  panel2.add(combo);
  panel2.add(boton);
  panel2.setSize(220, 300);
  setSize(350, 300);
  add(panel2);
  panel2.setBorder(BorderFactory.createTitledBorder("Resultados"));
  
  label2.setBounds(40, -60, 150, 195);
  txt.setBounds(70, 25, 99, 20);
  label3.setBounds(40, -210, 555, 550);  
  combo.setBounds(99, 55, 100, 20);
  boton.setBounds(50, 100, 150, 20);
  
  
 }
 public static void main(String[] args) {
  datosPersonales obj = new datosPersonales();
  
  obj.mipanel();
 }
 @Override
 public void itemStateChanged(ItemEvent evento) {
  
  
 }
}