Computer Science Example
Using a string tokenizer to get the data.

import java.io.*;
import java.text.*;
import java.util.*;

class BodyMassIndex
{
     public static void main (String [] args)
     {
          Person person = new Person ();
          person.getData ();
          person.displayData ();
     } // method main
} // class BodyMassIndex

// Class that uses a string tokenizer to get body mass index data.
class Person
{
     private String name;
     private double weight, height, heightFeet, heightInches;
 
     // Read a string of data from the keyboard and use a string tokenizer to separate it into parts.
     public void getData ()
     {
          String dataString;
          StringTokenizer tokenizer;
          BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in));
          try
          {
               System.out.println ("Enter name, weight in pounds, height in feet, and height in inches ");
               System.out.println (" on a single line, separated by spaces. ");
               dataString = stdin.readLine ();
               tokenizer = new StringTokenizer (dataString);
               name = tokenizer.nextToken ();
               weight = Double.parseDouble (tokenizer.nextToken());
               heightFeet = Double.parseDouble (tokenizer.nextToken ());
               heightInches = Double.parseDouble (tokenizer.nextToken ());
               height = 12 * heightFeet + heightInches;
          }catch (NumberFormatException e){System.out.println ("Number Format Exception");}
          catch (IOException e){System.out.println ("IO Exception");}
     } // method getData
 
     // Compute the body mass index and display it on the screen.
     public void displayData ()
     {
          double bmi = calculateBMI();
          System.out.print (name + "'s body mass index is ");
          System.out.println (decimals (bmi));
     } // method displayData

     // Calculate the body mass index using English units.
     private double calculateBMI ()
     {
          double bmi;
          bmi = (705 * weight) / (height * height);
          return bmi;
     } // calculateBMI
 
     // Format a double for string output with two decimal places.
     private String decimals (double number)
     {
          DecimalFormat decFor = new DecimalFormat ();
          decFor.setMaximumFractionDigits (2);
          decFor.setMinimumFractionDigits (2);
          return decFor.format (number);
     } // decimals
} //class Person