CS46A Fall 18

4A

You have all probably seen a snow globe - a glass ball containing a winter scene and filled with a liquid and white particles. When turned upside down, the white particles float to the bottom. When turned right-side up again, the particles drift down looking like snow.

Write a class SnowGlobe to model this behavior. There is no starter file but there is a tester

20% of the volume of the object will be filled with white particles while 50% will be filled with a liquid. The other 30% is the things in the scene.

The snow costs $1.25 per cubic centimeter

Provide 2 constructors. Both constructors have the same name, SnowGlobe. The compiler tells them apart because they have different parameter lists. This is called overloading):

• A no-argument constructor (also called a default constructor)
  Sets the radius to 10.0. This is measured in centimeters
• A constructor that accepts a double as the radius as an arguments. It is measured in in centimeters

It has methods

• setRadius Sets a new radius. It is a good practice for the constructors to call setRadius rather than setting the radius directly.
• getRadius Gets the radius
• getVolume Gets the volume of the sphere in cubic centimeter
• getSnowVolume Gets the volume of the snow in cubic centimeter. Do not calculate the volume of sphere in this method. Reuse the getVolume method so you only calculate the volume once.
• getSnowCost Gets the cost of the snow needed in this globe. Do not calculate the volume of snow in this method. Reuse the getSnowVolume method so you only calculate the snow volume once.

Define and use constants for the percent and the cost per cubic centimeter of the snow. That means you should not hard code .20 or 1.25 in the methods. you should use constants. Define them as class constants at the top of the class with the instance variables.

Provide Javadoc for the class, the constructor and methods

Formulas
Volume of a Sphere: v = 4/3 π r³ Use the constant from the Math class for pi. (Caution: remember about integer division. What is 4/3?)

For the draft , provide the instance variable, the no-argument constructor, the setRadius(), and getRadius() methods. Remember that instance variables should be private. Provide the Javadoc.

4A draft:
4A final:

4B

Complete the application InputApplication.

Create a Scanner object and do the following..

• Ask the user to enter a integer using this prompt: System.out.print("Enter an integer: "); I recommend copy/pasting it so you have it exactly right.
• Use Scanner's nextInt method to get the integer
• Print the integer
• Ask the user to enter another integer using this prompt: System.out.print("Enter another integer: ");
• Use Scanner's nextInt method to get the integer
• Print the integer
• Ask the user to enter a double using this exact prompt: System.out.print("Enter a double: ");
• Use Scanner's nextDouble method to get the double
• print the double
• Calculate the product of the two integers (Product means multiply)
• Print the product on a new line.
• Calculate the quotient of the product and the double (quotient means divide)
• Print the quotient on a new line.
• Print the integer portion of the quotient 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 StringStuff which creates a Scanner and then does the following:

• Ask the user to enter their full name using this exact prompt: System.out.print("Enter your full name: "); This may be several words
• Print the first letter of the name. Use the substring method.
• Print the last letter of the name. Use the substring method.
• Print just their first name. See below for some help with this
• Print the rest of the name (do not include the space)
• Print 2 characters starting at index 2. You can assume there are at least 5 character in the name.

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.

There is no starter file

For the draft, do the first three steps.

4C draft:
4C final: