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Job Summary:
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| Job Type: |
Project |
| Budget: |
$ 20-100 |
| Required
Skills: |
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| Attached
Files: |
java.zip
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| Status: |
Work Performed (selected user TechnoVilla)
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Buyer Summary:
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| Username: |
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| Feedback Score: |
2
reviews
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| Award Reliability: |
2 posted 2 paid |
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| Location: |
Sydney, Nsw, Australia
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| Member Since: |
May 28, 2008 |
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| Invited Users: |
There are no invited users
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Description
Task 1
Create a class called Person. This class has four fields:
• firstName – a String modeling a person’s first name
• lastName – a String modeling a person’s last name
• town – a String modeling a person’s town of residence
• age – an int variable modeling a person’s age
The Person class should have appropriate get and set methods. It should also have at least two constructors – one with no arguments and one with four arguments.
Create another class called TestAssign2. This class should have 3 Vector fields called first, last and towns. These fields should be instantiated in the class’s constructor. They should have appropriate get and set methods associated with them.
Task 2
There are four input files associated with this application:
• firstNamesBoys.txt – contains first names for boys
• firstNamesGirls.txt – contains first names for girls
• lastNames.txt - contains last names
• namesVicTowns.txt. – contains names of some Victorian towns
Each of these input files contains one word per line. Hence firstNamesBoys.txt will contain one boy’s name per line. These input files will be used to create random input files for your application.
Write a public method in TestAssign2 called readInputFiles. This method does the following:
• It opens and reads firstNamesBoys.txt. Each name should be read into a string and added to the Vector called first.
• It opens and reads firstNamesGirls.txt. Each name should also be read into a string and added to the Vector called first.
• It opens and reads lastNames.txt. Each last name should be read into a string and added to the Vector called last.
• It opens and reads namesVicTowns.txt. Each name should be read into a string and added to the Vector called towns.
Task 3
Write a public method in TestAssign2 called createPersonFile(person,size). This method will create a file which consists of a number of lines each containing four fields:
• The first field is the first name of a Person
• The second field is the last name of a Person
• The third field is the town of residence of a Person
• The fourth field is the age of the Person
The method has two parameters. The first is a String indicating the output file into which the records will be read (eg “Person”). The second is an int which indicates the number of records to be created in the new file (eg 50). You will need to create an output file. The name of this file should consist of the input name followed by the number of records followed by “.dat” and should be placed in the root of the C: drive. Thus with the above example, the output file should be “c:\\Person50.dat”.
Use the Random class provided by the SDK to create random records in the output file. For each line, choose a random String from the Vector called first, a random String from the Vector called last and a random String from the Vector called towns. Also create a random int between 0 and 100 which will be used for the Person’s age. The four randomly chosen data elements should be written in the correct order to a single line of the output file. The number of records (lines) created is determined by the method’s second parameter.
Task 4
Create an interface to define Linked List classes. It should be called LinkedListInt and should define all the methods necessary to create a linked list of objects of type T.
Further to this add two overloaded methods called printList:
• One is a void method that takes no parameters.
• One is a void method that takes a BufferedWriter parameter
Task 5
Create a class called LinkedList which implements LinkedListInt. The linked list should be implemented in using a dynamic structure – ie not implemented using arrays or Vectors.
The printList method which takes no arguments should print out the last names of each element in the LinkedList. This output should go to standard output.
The printList method which takes the BufferedWriter parameter should be sent to the file indicated by this BufferedWriter object.
Both printList methods should neatly print out last names 5 to each line.
Task 6
Create a class called Hash which implements a chained hashing structure with linked lists as home buckets. The chained hash table should be implemented using an array of 30 LinkedList objects. You will need to use the LinkedList class you created in Task 5.
Write a private method called hash which takes a String as a parameter. This method should return an int between 0 and 29 (inclusive). This value is calculated by adding the ASCII values of each character in the String and then using the modulus operator (%).
Write a public method called insert. This method takes a Person object as a parameter. A hash value should be obtained by passing the Person’s last name to the hash method that you have just written. If the LinkedList object at the array position, indicated by the value returned by the hash method, is null then instantiate it. Add the Person object to the end of this LinkedList object.
Write a public method called retrieve. This method takes a String object corresponding to the Person’s last name as a parameter. The method should return a value of type Object. This Object should be the Person object associated with the last name passed in. The method should return null if the object is not found.
Write a public method called printTable. This method takes a BufferedWriter parameter indicating the file where the output should be sent to. The method should print out the last names of each of the objects in the LinkedLists of the hashTable. Ensure that each list is appropriately titled. All output should be sent to the file indicated by the BufferedWriter object.
Task 7
Write a public method in TestAssign2 called testHashing. This method is designed to test the efficiency of the hash table implementation. This method should do the following:
• Create an input file of 500 Person objects
• Place these objects into a hash Table
• Create a BufferedWriter object based on an output with the following name:
o “hash” + 500 + “.out”.
o This file should be located in the root of your project
• Use the printTable method to output the hashTable to the above file
• Choose a lastName (at random) from the Vector called last. Indicate whether this name is contained in the hash table. Send the output (appropriately set out) to the above hash table output file
Reminder
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Dhaka,
BD
location |
US$70
bid amount
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(206
reviews)
feedback |
3 day(s)
delivery time |
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Please check PM
Bid Time: 05-29-2008 22:47
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| Shortlist |
| Decline Bid |
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Nugegoda,
LK
location |
US$150
bid amount
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(87
reviews)
feedback |
5 day(s)
delivery time |
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Hi, we can do this.
Bid Time: 05-29-2008 21:05
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| Shortlist |
| Decline Bid |
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Atlanta,
US
location |
US$125
bid amount
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(48
reviews)
feedback |
5 day(s)
delivery time |
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Please see PMB.
Thx
-Aanvik
Bid Time: 05-29-2008 21:44
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| Decline Bid |
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nagpur,
IN
location |
US$150
bid amount
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(2
reviews)
feedback |
20 day(s)
delivery time |
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This can be done
Bid Time: 05-29-2008 21:18
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