CS46A Spring 19

4A

At Java Inc, we want to sell a large helium balloon printed with the words "Java Rules." It is up to you to figure out what price to charge so that we make $2 profit per balloon. The balloon itself cost $5.50. We buy a tank of helium for $235.00. The tank holds 300 cubic feet.

Write a class HeliumBalloon

public HeliumBalloon( double theRadius) where radius is given in inches

• public void setRadius(double newRadius) sets the radius to the given value
• public double getRadius() gets the radius
• public double volume() gets the volume. (Remember the problem with integer division.)
• public double costOfGoods() gets what the balloon costs us to manufacture. Do not put code to calculate volume in this method. Call the volume method to do the calculation for you
• public double retailPrice() gets the price we will charge the customer. Do not put code to calculate volume or the cost of the goods in this method. Call the costOfGoods method to do that for you.

Use these constants:
public static final int CUBIC_INCHES_PER_CUBIC_FOOT = 1728;
public static final double PROFIT = 2.0;

Also define and use constants for PRICE_OF_BALLOON, PRICE_OF_TANK, and VOLUME_OF_TANK_IN_CUBIC_FEET.

Provide Javadoc

For the draft, define the instance variable, the constructor, getRadius, setRadius, and the constants. You should only have one instance variable. Provide Javadoc

Formula for volume of a sphere (in case you need it)

4A draft:
4A final:

4B

Write an application Vegetable. (An application has a main method.)

Create a Scanner object and do the following..

• Ask the user to enter a their favorite dessert using this exact prompt: System.out.print("Enter your favorite vegetable: "); (The vegetable might be more than one word.)
• Use Scanner's nextLine method to get the vegetable
• Print it
• Ask the user to enter a double using this exact prompt: System.out.print("On average, how many serving of vegetables do you eat per day?: ");
• Use Scanner's nextDouble method to get the double
• Print it.
• Now ask the user to enter a integer using this prompt: System.out.print("How many times a week do you eat vegetables?: ");
• Use Scanner's nextInt method to get the integer
• Calculate the product of the double and the integer (Product means multiply)
• Print "Vegetables per week: " followed by the product
• Print the integer portion of the product on a new line.(Think cast)

Only create one Scanner.

For the draft, create the Scanner and do the first three steps.

4B draft:
4B final:

4C

Write a class StringsRUs that creates a Scanner and does the following:

• Ask the user to enter the full name of their favorite author using this exact prompt: System.out.print("Favorite author? "); The name may be several words
• Print the first and last letters of the name with no space.
• Print just the first name. See the hint below for some help with this
• Print the rest of the name (do not include the space)
• Print 3 characters starting at index 4. You can assume there are at least 7 character in the name.

Hint: To get just the first name, you need to know the index of the first space. You can find the index of the first space with the indexOf method. str.indexOf(" ") will return the index of the first space or -1 if there are no spaces in str. You can assume there is at least one space so you do not need to worry about -1 for this problem. After you find the index of the fist space, you can use substring to get the first name.

For the draft, do the first two steps.

4C draft:
4C final: