Lab 21

Box Sorter!

Objective:

Write a program where the user enters in information about 5 boxes, and then they are sorted by their volume.

Create a class called Box

• This class has four instance variables
• Label: the name of the box
• Length: the length in feet
• Width: the width in feet
• Height: the height in feet
• Assume Length, Width, and Height are all decimal values
• Constructors
• Default
• Parameterized (MUST CHECK FOR VALID VALUES)   
• Accessors for every instance variable
• Mutators for every instance variable
• CHECK FOR VALID VALUES!
• Length Width and Height should all be greater than 0
• Other methods
• getVolume: this method returns a decimal value corresponding to its volume.  It also has no parameters
• toString: This method returns a string which is made up of the label of the box and its volume

Create another class called BoxSorter

• This class has a main method
• An array of boxes
• Prompts the user for box information
• Sorts the boxes
• Displays the sorted boxes

Example Dialog:

Welcome to the box sorter!

Enter the information about boxes and I'll sort them!

Enter the label, length, width, and height (all feet) of box 1

Random electronics

2.0

2.0

2.0

Enter the label, length, width, and height (all feet) of box 2

Art supplies

1.0

3.0

1.0

Enter the label, length, width, and height (all feet) of box 3

Video Games Box 1

4.0

4.0

3.0

Enter the label, length, width, and height (all feet) of box 4

Board Games Box 3

3.0

3.0

2.0

Enter the label, length, width, and height (all feet) of box 5

Imported Cheeses

0.5

0.5

0.25

Sorted boxes

Label: Imported Cheeses Volume: 0.0625

Label: Art supplies Volume: 3.0

Label: Random electronics Volume: 8.0

Label: Board Games Box 3 Volume: 18.0

Label: Video Games Box 1 Volume: 48.0

Lab Report Question:

1. Define what “null” means.
2. Is it safe to assume when an array of objects is declared and initialized that each of the individual objects is also constructed?

Finally:

Upload the all files to the dropbox