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CSE110 Assignment 7

Assignment #7

CSE110 - Arizona State University

Topics

  • 2-Dimensional Arrays
  • Classes
  • Searching
  • Reading from a file

Coding Guidelines:

  • Give identifiers semantic meaning and make them easy to read (examples numStudents, grossPay, etc).
  • Keep identifiers to a reasonably short length.
  • User upper case for constants. Use title case (first letter is upper case) for classes. Use lower case with uppercase word separators for all other identifiers (variables, methods, objects).
  • Use tabs or spaces to indent code within blocks (code surrounded by braces). This includes classes, methods, and code associated with ifs, switches and loops. Be consistent with the number of spaces or tabs that you use to indent.
  • Use white space to make your program more readable.

Part #1: Written Exercises (0 pts)

None.

Part #2 - Programming (20 pts)

Write a program that reads customers’ information from a file, and creates a movie theatre seating with a number of rows and columns specified by a user. Then it will attempt to assign each customer to a seat in a movie theatre.

You will be creating a class called MovieSeating. This class should be defined in a file named MovieSeating.java. The class MovieSeating will contain a 2 dimensional array called seating of Customer objects as its instance variable.

We will be using the following files. These files are complete. Download the following files (available on Blackboard) and use them for this assignment (do not change the content of the following files).

  • java
  • java
  • java

The last file is an input file (text file) that will be read from the Assignment7 class. Save all of the files in the same folder.

The class MovieSeating must include the following constructor and methods. (If your class does not contain any of the following methods, points will be deducted.)

  • public MovieSeating(int rowNum, int columnNum) - It instantiates a two dimensional array of the size rowNum by columnNum specified by the parameters. Then it initializes each customer element of this array using the constructor of the class Customer without any parameter. So each customer will have default values for its instance variables.
  • private Customer getCustomerAt(int row, int col) - It returns a customer at the indexes row and col (specified by the parameters of this method) of the array seating.
  • public boolean assignCustomerAt(int row, int col, Customer tempCustomer) - The method attempts to assign tempCustomer to the seat at row and col (specified by the parameters of this method). If the seat has a default customer, i.e., a customer with the last name "???" and the first name "???", then we can assign the new customer tempCustomer to that seat and the method returns true. Otherwise, this seat is considered to be taken by someone else, the method does not assign the customer and returns false.
  • public boolean checkBoundaries(int row, int col) - The method checks if the parameters row and col are valid. If at least one of the parameters row or col is less than 0 or larger than the last index of the array (note that the size of rows and columns can be different), then it returns false. Otherwise it returns true.
  • public String toString() - Returns a String containing information of the seating. It should show the list of customers assigned to the seating using the toString method of the class Customer (it shows initials of each customer) and the following format:

The current seating --------C.B. ?.?. E.P.

?.?. ?.?. G.B.

B.C. H.C. ?.?.

Please see the sample output listed below.

Helpful Hints

  • Work on it in steps - write one method, test it with a test driver and make sure it works before going on to the next method.
  • Always make sure your code compiles before you add another method.
  • Your methods should be able to be called in any order.

Sample Output

Make sure that your program works at least with this scenario (the inputs entered by a user are shown in bold).

Please enter a number of rows for a movie theatre seating

3

Please enter a number of columns for a movie theatre seating.

3

Please enter a file name

customerData.txt

A customer information is read from a file.

George Bush/111111111/3/4

Please enter a row number where the customer wants to sit.

1

Please enter a column number where the customer wants to sit.

2

The seat at row 1 and column 2 is assigned to the customer G.B.

The current seating

——————–

?.?. ?.?. ?.?.

?.?. ?.?. G.B. ?.?. ?.?. ?.?.

A customer information is read from a file.

Bill Clinton/222222222/6/5

Please enter a row number where the customer wants to sit.

2

Please enter a column number where the customer wants to sit.

0

The seat at row 2 and column 0 is assigned to the customer B.C.

The current seating

——————–

?.?. ?.?. ?.?.

?.?. ?.?. G.B. B.C. ?.?. ?.?.

A customer information is read from a file.

Hilary Clinton/444444444/5/3

Please enter a row number where the customer wants to sit.

2

Please enter a column number where the customer wants to sit.

1

The seat at row 2 and column 1 is assigned to the customer H.C.

The current seating

——————–

?.?. ?.?. ?.?.

?.?. ?.?. G.B.

B.C. H.C. ?.?.

A customer information is read from a file.

Charlie Brown/333333333/4/3

Please enter a row number where the customer wants to sit.

0

Please enter a column number where the customer wants to sit.

0

The seat at row 0 and column 0 is assigned to the customer C.B.

The current seating

——————–

C.B. ?.?. ?.?.

?.?. ?.?. G.B.

B.C. H.C. ?.?.

A customer information is read from a file.

David Beckham/555666777/4/5

Please enter a row number where the customer wants to sit.

5

Please enter a column number where the customer wants to sit.

1

Row or column number is not valid.

A customer David Beckham is not assigned a seat.

A customer information is read from a file.

David Johnson/666888999/16/5

Please enter a row number where the customer wants to sit.

2 Please enter a column number where the customer wants to sit.

0

The seat is taken.

A customer information is read from a file.

Snow White/777777777/43/23

Please enter a row number where the customer wants to sit. -1

Please enter a column number where the customer wants to sit.

0

Row or column number is not valid.

A customer Snow White is not assigned a seat.

A customer information is read from a file.

Elvis Presley/888888888/2/4

Please enter a row number where the customer wants to sit.

0

Please enter a column number where the customer wants to sit.

2

The seat at row 0 and column 2 is assigned to the customer E.P.

The current seating

——————–

C.B. ?.?. E.P. ?.?. ?.?. G.B.

B.C. H.C. ?.?.

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