OBJECTIVES Doing this lab, students have the chance to:
-Review the concept of Hashtable data structures
-Know how to implement the Java Hashtable class: use functions, put, get, remove, etc.
-Know how to read the information of the object from an input file, place to the Hashtable object and write the information of all the nodes in the structure to the file before terminating the program
-Know how to display all the nodes in the Hashtable on the screen
Part1: Java class Hashtable REQUIREMENT The company A stores the information of all employees in the text file named as employeeInfo.txt. The information of each employee is written on one line in the following format, for example:
For the employee:
Bill - White - 0012345 - Marketing department - 45000
Or for the employee with the tittle:
Nancy - Nguyen - 1234567 - Sale department - 40000 - Manager
The application will use Hashtable object as data structure then open and read the file employeeInfo.txt The information of each line of the file employeeInfo.txt as a node to be inserted to the data structure. After reading the file, ensure all the information of employees or title employees are stored in the data structure by showing all nodes.
Provide the menu to allow users to select the following tasks. After finishing each task, re-display the menu to allow user to continue using the application:
1. Insert employee or employee with title
2. Fetch
3. Encapsulation
4. Update
5. Delete
6. Show all
7. Exit
//INSERT data to the Hashtable
-Allow users to enter the information of an employee or an employee with the title from the keyboard
-Create the object then insert to the data structure -Users can continue inputing until users want to stop
//FETCH data -Allow users to type an employee id then read the information from the data structure to print out the information on the screen
//ENCAPSULATION -Allow users to type an employee id from the keyboard. Using the entered employee id to read the information of the node from data structure then assign the information to the node named "temp". Change the salary of the node temp
-Fetch the node with the entered employee id again then compare its salary with the salary of the node temp. . If the salary are different then display the message box: "The Java Hashtable structure has the encapsulation"; otherwise display the message box: "The Java Hashtable structure does not have the encapsulation"
//UPDATE data Display the message to ask users to enter the employee id. Using the employee id to read the node out the data structure. Asking for the new department from the keyboard. Change the department with the new department. Display the node from the data structure to check new updated information
//DELETE data Display the message to ask users to enter the employee id. Remove the node with the entered employee id
//SHOW ALL Display all the nodes are currently stored in the data structure
//Exit program When users choose to exit the program, open the file employeeInfo.txt to write and write all the information of employee nodes stored in the data structure to the file employeeInfo.txt Close file
ANALYZING AND DESIGNING -Draw the UML of class Employee_yourLastName and class TitleEmployee_yourLastName -Write the pseudo-code of the main()
PART2: Linear Quotient (LQHashed) Data Structure OBJECTIVES Doing this lab, students have the chance to:
-Implement the Linear Quotient (LQHashed) data structure: understand Insert, Fetch, Delete and update algorithm of the LQhashed structure -Know how to display all the nodes in the LQHashed data structure on the screen
REQUIREMENT Provide the application that creates a data structure of type LQHashed then provides the menu that includes the following tasks and allow users to work on each task until users want to exit
1. Insert
2. Fetch
3. Encapsulation
4. Update
5. Delete
6. Show all
INSERT data -read input information of employees or title employees from the keyboard then create the object and add to the data structure until users want to stop.
FETCH data -Display the message to ask for an employee id then Fetch the node from the LQHashed data structure to node named temp and display the information of node
ENCAPSULATION -Use the above node fetched from the LQHahsed data structure, change the salary of temp -Fetch employee with the same employee id again to see if they have the same salary then display display the message box: "The LQHashed structure has the encapsulation"; otherwise display the message box: "The LQHashed structure does not have the encapsulation"
UPDATE data
-Display the message and read the employee id then fetch the node to node temp
-Read the new department from the keyboard, update the new department to temp
-Update the new node to the data structure
DELETE data -Display the message and read the employee id then using the employee id to delete the node
SHOWALL -Display all the nodes currently stored in the data structure
ANALYZING AND DESIGNING -Write the pseudo-code of the main()