import java.applet.*;
   import java.awt.*;
   import java.awt.event.ActionListener;
   import java.awt.event.ActionEvent;


    public class HelloApplet extends Applet implements ActionListener     {
      private static final int ANSWER_LENGTH = 50;
      private TextField ageBox = new TextField (3);
      private Label ageLabel = new Label ("How old are you?");
      private TextField answer = new TextField (ANSWER_LENGTH);
      private Button doItButton = new Button ("Go ahead!");
   
   
       public void init () {
         this.add (this.ageLabel);		
         this.add (this.ageBox);
         this.add (this.doItButton);
         this.add (this.answer);
         this.doItButton.addActionListener (this);
         }
     
       public void actionPerformed (ActionEvent whatHappened) {
         try {
            int age = Integer.parseInt (this.ageBox.getText());
      
            if (age >= 18) {
               this.answer.setText ("" + age + " is old enough to vote.  Congratulations!");
               }
            else {
               this.answer.setText ("" + age + " is NOT old enough to vote.");
               }
            }
         catch (java.lang.NumberFormatException whatsWrong) {
               this.answer.setText ("I don't understand \"" +
		this.ageBox.getText() + "\"; the age must be an integer.");
            }
         }
      }