Computer/IT expert only

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 in- stance 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).

• Assignment7.java

• Customer.java

• CustomerData.java

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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

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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 ——————–

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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. ?.?.

Submission

• Go to the course web site (my.asu.edu), and then click on the on-line Submission tab.

• Submit your Assignment7.java, MovieSeating.java, Customer.java, and customerData.txt files on-line. Make sure to choose Hw7 from drop-down box.

Important Note: You may resubmit as many times as you like until the deadline, but we will only mark your last submission.

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NO LATE ASSIGNMENTS WILL BE ACCEPTED.

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week7/Customer.java

week7/Customer.java

/*-------------------------------------------------------------------------
// AUTHOR: CSE110 instructor
// FILENAME: Customer.java
// SPECIFICATION: The class Customer describes information on a customer
// and has a first name (a String), last name (String),  ID number (integer),
// number of matinee tickets (integer),  number of normal tickets (integer), and total cost (double).
// YOUR Lab Letter and Name of the TA for your Closed lab
// FOR: CSE 110- on-line section A
// TIME SPENT: how long it took you to complete the assignment
//----------------------------------------------------------------------*/


import  java . util . StringTokenizer ;
import  java . text . NumberFormat ;

public   class   Customer
  {
    private   String  lastName ;
    private   String  firstName ;
    private   int  customerID ;
    private   int  matineeTickets ;
    private   int  normalTickets ;
    private   double  totalCost ;

    // This constructor sets the first name and last name to "???", customer ID,
    // the number of matinee tickets, and the number of normal tickets to 0,
    // and the total cost to 0.0.
    public   Customer ()
      {
          lastName  =   "???" ;
          firstName  =   "???" ;
          customerID  =   0 ;
          matineeTickets  =   0 ;
          normalTickets  =   0 ;
          totalCost  =   0.0 ;
       }
    // This constructor constructs a Customer object  given the last name,
    // first name, customer id, the number of matinee tickets, the number
    // of normal tickets.
    public   Customer ( String  customerInfo )
      {
          String   [] tokenizer  =  customerInfo . split ( " " );
         firstName  =  tokenizer [ 0 ]. trim ();
         lastName  = tokenizer [ 1 ]. trim ();
         customerID  =   Integer . parseInt ( tokenizer [ 2 ]. trim ());
         matineeTickets  =   Integer . parseInt ( tokenizer [ 3 ]. trim ());
         normalTickets  =   Integer . parseInt ( tokenizer [ 4 ]. trim ());
         totalCost  =   0.0 ;
         computeTotalCost ();
      }

    // This constructor cConstructs a Customer object using the string containing customer's info.
    // It uses the StringTokenizer to extract first name, last name, id, the number of matinee tickets,
    // and the number of normal tickets.
    public   Customer ( String  lName ,   String  fName ,   int  id ,   int  matineeNum ,   int  normalNum )
      {
         lastName  =  lName ;
         firstName  =  fName ;
         customerID  =  id ;
         matineeTickets  =  matineeNum ;
         normalTickets  =  normalNum ;
         totalCost  =   0.0 ;
         computeTotalCost ();
      }

    // This method sets the last name.
    public   void  setLastName ( String  lName )
      {
         lastName  =  lName ;
      }
    // This method sets the first name.
    public   void  setFirstName ( String  fName )
      {
         firstName  =  fName ;
      }
    // This method sets the customer ID.
    public   void  setCustomerID ( int  id )
      {
         customerID  =  id ;
      }

    // This method set the value of number of matineeTickets to  have its parameter value.
    // And it re-computes total cost.
    public   void  setMatineeTickets ( int  matinee )
      {
         matineeTickets  =  matinee ;
         computeTotalCost ();
      }

    // This method set the value of number of notmalTickets to  have its parameter value.
    // And it re-computes total cost.
    public   void  setNormalTickets ( int  normal )
      {
         normalTickets  =  normal ;
         computeTotalCost ();
      }


    // This method returns the last name.
    public   String  getLastName ()
      {
          return  lastName ;
      }
    // This method returns the first name.
    public   String  getFirstName ()
      {
          return  firstName ;
      }

    // This method returns the customer ID.
    public   int  getCustomerID ()
      {
          return  customerID ;
      }

    // This method returns the number of matinee tickets.
    public   int  getMatineeTickets ()
      {
          return  matineeTickets ;
      }

    // This method returns the number of normal tickets.
    public   int  getNormalTickets ()
      {
          return  normalTickets ;
      }

    // This method returns the total cost.
    public   double  getTotalCost ()
      {
          return  totalCost ;
      }

    // This method compute the total cost based on the number of matinee tickets and normal tickets.
    private   void  computeTotalCost ()
      {
        totalCost  =   ( 5.00 ) * matineeTickets  +   ( 7.50 ) * normalTickets ;
      }

    // This method checks if a customer object passed as a parameter and itself (customer object)
    // are same using their last names, first names, and customerIDs.
    public   boolean  equals ( Customer  other )
      {
          if   ( lastName . equals ( other . lastName )   &&  firstName . equals ( other . firstName )
              &&   ( customerID  ==  other . customerID )   )
              return   true ;
          else
              return   false ;
      }
    // This method compares a customer object passed as a parameter to itself (customer object)
    // are same using their total costs.
    public   Customer  hasMore ( Customer  other )
      {
          if   ( totalCost  >=  other . totalCost )
            return   this ;
          else
            return  other ;
       }

    // This method returns a string containing a customer's initials
    // (first characters of firstName and lastName.)
    public   String  toString ()
       {
            String  result  =  firstName . charAt ( 0 )   +   "."   +  lastName . charAt ( 0 )   +   "." ;
            return  result ;
       }


  }   // end of the class Customer