This is my second effort in Java. I modified my original Python program to function in Java. I think t turned out pretty well. The process allowed me to write the code without having to think too hard about what exactly I was making and how I could make it calculate correctly . I will probably do the same with most of the other challenges.

Challenge2.java

// Create a calculator application that has use in your life. 
// It might be an interest calculator, or it might be something 
// that you can use in the classroom.
// I created this originally in Python, and this is a conversion to Java.
import java.util.Scanner;

public class Challenge2{
	public static void main(String[] agrs){
		int milesPerGallon, miles;
		float gasPrice, mileCost;
		Scanner input = new Scanner(System.in);
        //receive data
		System.out.print("What is the average MPG of your car? ");
		milesPerGallon = input.nextInt();
		System.out.print("How many miles do you drive to work? ");
		miles = input.nextInt();
		System.out.print("What is the price per gallon for gas? ");
		gasPrice = input.nextFloat();

        // give results
		miles = miles * 2;
		System.out.println("We will double the miles for the round trip.");
		mileCost = (miles/milesPerGallon) * gasPrice;
		System.out.println("Here are the stats for your commute cost.");
		System.out.println("Round trip: " + mileCost);
		System.out.println("Five days a week: " + (mileCost * 5) + "per week.");
	}
}