Program

Re-design this program using methods. Explain the justification behind your re-design and why using methods is advantageous.
The following program prompts a user to enter temperatures in degrees Fahrenheit or Celsius. It then converts the entered temperature to the other measurement scale and displays both the entered temperature and the equivalent temperature in the other measurement scale.
import java.util.Scanner;
public class TemperatureConversion
{
public static void main( String [] args )
{
int userChoice = 0; // User selection: 1, 2, 3
float temperatureFahrenheit = 0; // Fahrenheit temperature
float temperatureCelsius = 0; // Celsius temperature
Scanner input = new Scanner( System.in ); // Create a Scanner to obtain user input
while( userChoice != 3 )
{
System.out.print( "Enter 1 to convert F->C, 2 to convert C->F, 3 to quit: " );
userChoice = input.nextInt(); // Read user input
switch( userChoice )
{
case 1: // Convert Fahrenheit to Celsius
System.out.print( "Enter a Fahrenheit temperature: " );
temperatureFahrenheit = input.nextFloat();
temperatureCelsius = 5F/9F * ( temperatureFahrenheit - 32F );
System.out.println( temperatureFahrenheit + " degrees Fahrenheit is " + temperatureCelsius + " degrees Celsius" );
break;
case 2: // Convert Celsius to Fahrenheit
System.out.print( "Enter a Celsius temperature: " );
temperatureCelsius = input.nextFloat();
temperatureFahrenheit = 9F/5F * temperatureCelsius + 32F;
System.out.println( temperatureCelsius + " degrees Celsius is " + temperatureFahrenheit + " degrees Fahrenheit" );
break;
case 3: // End Program
System.out.println( "Bye Bye" );
break;
default: // Invalid Data Entered
System.out.println( "Invalid Data: You must enter 1, 2, or 3" );
}
}
}
}
Re-design this program using methods. Explain the justification behind your re-design and why using methods is advantageous.