Question

Objective

This assignment is to review what you should have learned in CSC 142 and learn how I want you to do pseudocode and commenting for 143. Here’s the highlights this assignment will focus on:

• Indefinite Loops

• File Processing

• Arrays

• Classes

Description

You will choose a subject that’s familiar to you and create a program to read an inventory of items. You will create a java Class to hold the items, store them into an array of that class, and print a filtered set of them using a fencepost loop.

As an example, I created an inventory of fly fishing rods. Here’s a sample input file and console output:

Manufacturer Type Weight Length

Sage Standard 5 108

Sage Spey 9 132

TFO Standard 8 108

Orvis Standard 4 96

Which Field to filter on? Manufacturer

Enter the string: sage

Rod [Manufacturer=Sage, Type=Standard, Weight=5, Length=108]

Rod [Manufacturer=Sage, Type=Spey, Weight=9, Length=132]

Which Field to filter on? type

Enter the string: spey

Rod [Manufacturer=Sage, Type=Spey, Weight=9, Length=132]

Which Field to filter on? w

Enter the value: 5

Rod [Manufacturer=Sage, Type=Standard, Weight=5, Length=108]

Which Field to filter on? l

Enter the value: 108

Rod [Manufacturer=Sage, Type=Standard, Weight=5, Length=108]

Rod [Manufacturer=TFO, Type=Standard, Weight=8, Length=108]

Requirements

Your inventory must have the following:

• At least 10 items

• At least 4 fields with 2 different data types

• The names of the fields should start with different letters to make it easier to code

Phase 1 - Pseudocode

You will write some brief pseudocode for your code so I can give you feedback your project before you go through writing the code.

Start by identifying a subject you’re familiar with which has a list of items you can put together. Then create the design for a Java Class to hold those items.  

See the “What is Pseudocode” page for information on how to write pseudocode and “Simple Guidelines” for what is correct pseudocode.

Phase 2 - Coding

You will write the complete code for your project and submit both the code, output, and debugging.

Code Requirements

• Name the client class with main “Inventory” with matching case. This is extremely important or your code won’t run in my test environment.

• Put all classes into one file by omitting the “public” from all but the first

• Javadoc function headers with explanations of the function purpose, inputs, and returns

• Comments above each code block, blank lines separating blocks that carry out one purpose, but none within the block

• Do not comment each line, or lines which are obvious (e.g. print a blank line)

• Data must be encapsulated as best as you can

• Your main() should be a small as possible

• All the real work should be in several very methods with clear purposes.

• Ignores upper and lowercase

• Accepts any input with the correct first letter in upper or lowercase

Answer 1

package file;

import java.io.*;

import java.util.Scanner;

/**

* Defines a class to store inventory information

*/

public class Inventory

{

/**

* Instance variable to store data

*/

String manufacturer;

String type;

int weight;

int length;

/**

* Default constructor to initialize default values to

* instance variables

*/

Inventory()

{

manufacturer = type = "";

weight = length = 0;

}// End of default constructor

/**

* Parameterized constructor to assign parameter values

* to instance variables

*/

Inventory(String ma, String ty, int we, int le)

{

manufacturer = ma;

type = ty;

weight = we;

length = le;

}// End of parameterized constructor

/*

* Overrides toString() method to return

* inventory information

* @see java.lang.Object#toString()

*/

public String toString()

{

return "Rod [Manufacturer = " + manufacturer +

", Type = " + type + ", Weight = " + weight +

", Length = " + length + "]";

}// End of method

/**

* Method to red file contents

* @param inv[] array of Inventory class object

* @return number of records

*/

int readFile(Inventory inv[])

{

// Local variable to store data read from file

String manufacturer;

String type;

int weight;

int length;

// Record counter

int counter = 0;

// Try block

try

{

// File Reader object created to read data

// from Popularity.txt file

File reader = new File("Inventory.txt");

// Scanner class object created

Scanner sc = new Scanner(reader);

// Loops till data available

while(sc.hasNext())

{

// Reads data

manufacturer = sc.next();

type = sc.next();

weight = sc.nextInt();

length = sc.nextInt();

/*

* Creates an object using

* parameterized constructor and assigns it

* at counter index position of array of object  

*/

inv[counter] = new Inventory(manufacturer, type,

weight, length);

// Increase counter by one

counter++;

}// End of while

// Closer the file

sc.close();

} // End of try block

// Catch block to handle file not found exception

catch(FileNotFoundException e)

{

System.out.println("File Not found");

e.printStackTrace();

}// End of catch

// Returns record counter

return counter;

}// End of method

/**

* Method to search data based on filter type

* @param inv[] - array of Inventory class object

* @param len - number of records

* @param filterType - Searching sting type

*/

void search(Inventory inv[], int len, String filterType)

{

// Scanner class object created

Scanner keyboard = new Scanner(System.in);

// Found status initially -1 for not found

int f = -1;

// To store the string data entered by the user to search

String strData;

// To store the integer data entered by the user to search

int intData;

// Checks the first character of the filterType

switch(filterType.charAt(0))

{

// Manufacturer

case 'M':

case 'm':

// Accepts manufacturer data

System.out.print("\n Enter the string: ");

strData = keyboard.next();

// Loops till number of records

for(int c = 0; c < len; c++)

/**

* Checks if current object manufacturer

* is equals to the user entered manufacturer

* sets the found status f to c value

* displays the found inventory record

*/

if(inv[c].manufacturer.

compareTo(strData) == 0)

{

f = c;

System.out.println(inv[c]);

}// End of if condition

break;

// Type

case 'T':

case 't':

// Accepts type data

System.out.print("\n Enter the string: ");

strData = keyboard.next();

// Loops till number of records

for(int c = 0; c < len; c++)

/**

* Checks if current object type is equals

* to the user entered type

* sets the found status f to c value

* displays the found inventory record

*/

if(inv[c].type.compareTo(strData) == 0)

{

f = c;

System.out.println(inv[c]);

}// End of if condition

break;

// Weight

case 'W':

case 'w':

// Accepts weight data

System.out.print("\n Enter the value: ");

intData = keyboard.nextInt();

// Loops till number of records

for(int c = 0; c < len; c++)

/**

* Checks if current object weight is equals

* to the user entered weight

* sets the found status f to c value

* displays the found inventory record

*/

if(inv[c].weight == intData)

{

f = c;

System.out.println(inv[c]);

}// End of if condition

break;

// Length

case 'L':

case 'l':

// Accepts length data

System.out.print("\n Enter the value: ");

intData = keyboard.nextInt();

// Loops till number of records

for(int c = 0; c < len; c++)

/**

* Checks if current object length is equals

* to the user entered length

* sets the found status f to c value

* displays the found inventory record

*/

if(inv[c].length == intData)

{

f = c;

System.out.println(inv[c]);

}// End of if condition

break;

case 'E':

case 'e':

System.exit(0);

default:

System.out.println("Invalid Field " +

"to filter");

}// End of switch case

// Checks if found status f value is -1 record not found

if(f == -1)

System.out.println("\n No such item.");

}// End of method

// main method definition

public static void main(String ss[])

{

// Scanner class object created

Scanner input = new Scanner(System.in);

// Creates an array of object of class Inventory

// of size 5

Inventory inv[] = new Inventory[5];

// Creates the first object using default constructor

inv[0] = new Inventory();

// Calls the method to read file and stores it in

// array of object

// Stores the return value as number of objects

int len = inv[0].readFile(inv);

// To store filter type entered by the user

String filterType;

// Loops till number of records and displays each record

for(int c = 0; c < len; c++)

System.out.println(inv[c]);

// Loops till user choice is not 'Exit' or 'E' or 'e'

do

{

// Accepts filter type from the user

System.out.print("\n Which Field to filter " +

"on (Exit to stop)? ");

filterType = input.next();

// Call the method to search record

// and displays it

inv[0].search(inv, len, filterType);

}while(true);// End of do - while loop

}// End of main method

}// End of class

Sample Output:

Rod [Manufacturer = Sage, Type = Standard, Weight = 5, Length = 108]
Rod [Manufacturer = Sage, Type = Spey, Weight = 9, Length = 132]
Rod [Manufacturer = TFO, Type = Standard, Weight = 8, Length = 108]
Rod [Manufacturer = Orvis, Type = Standard, Weight = 4, Length = 96]
Rod [Manufacturer = Orvis, Type = Spey, Weight = 8, Length = 132]

Which Field to filter on (Exit to stop)? Danger
Invalid Field to filter

No such item.

Which Field to filter on (Exit to stop)? Manufacturer

Enter the string: Orvis
Rod [Manufacturer = Orvis, Type = Standard, Weight = 4, Length = 96]
Rod [Manufacturer = Orvis, Type = Spey, Weight = 8, Length = 132]

Which Field to filter on (Exit to stop)? Type

Enter the string: Sage

No such item.

Which Field to filter on (Exit to stop)? Type

Enter the string: Standard
Rod [Manufacturer = Sage, Type = Standard, Weight = 5, Length = 108]
Rod [Manufacturer = TFO, Type = Standard, Weight = 8, Length = 108]
Rod [Manufacturer = Orvis, Type = Standard, Weight = 4, Length = 96]

Which Field to filter on (Exit to stop)? Weight

Enter the value: 9
Rod [Manufacturer = Sage, Type = Spey, Weight = 9, Length = 132]

Which Field to filter on (Exit to stop)? Length

Enter the value: 192

No such item.

Which Field to filter on (Exit to stop)? Length

Enter the value: 132
Rod [Manufacturer = Sage, Type = Spey, Weight = 9, Length = 132]
Rod [Manufacturer = Orvis, Type = Spey, Weight = 8, Length = 132]

Which Field to filter on (Exit to stop)? Exit

Inventory.txt file contents

Sage Standard 5 108
Sage Spey 9 132
TFO Standard 8 108
Orvis Standard 4 96
Orvis Spey 8 132