- Major-related courses
- /
- COTI 3102
Java is a high-level object-oriented programming language with portable, secure, and platform-independent desktop, web, mobile, and corporate development applications.
Problem
In package edu.uprb.company, place an enumerated type named Department with the following values:
- SALE – for Budget
- MKTG – for Marketing
- HMRS – for Human Resources
- FINA – for Finance
- INTE – for Information Technology
2. In package edu.uprb.company place an class named Employee that holds the following data for a company employee:
- id – an integer between 1000 and 9999. This should be a final field.
- name – a string with one uppercase letter and, at most, nine more lowercase letters; default value = "John".
- lastName – a string with one uppercase letter and, at most, nine more lowercase letters; default value = "Doe".
- department – a Department; default value = FINA.
- hours – hours worked during the week an integer between 0 and 60; default value = 40.
- payRate – a floating-point number between 7.00 and 50.00; default value = 8.25.
This class must have the following methods:
- A fully parameterized constructor and a constructor that receives only the employee ID.
- Setters and getters for each field. Since the employee ID is final, only a getter must be provided for this field.
- Constructors and setters must not allow an invalid ID value or an invalid name format by throwing an IllegalArgumentException with the appropriate message.
- A weeklySalary method that, when implemented by an class, returns the weekly salary of the employee.
- A toString method that returns a string representation of the employee. Each field should have the appropriate label and format.
3. Since a class diagram for the classes in package edu.uprb.company was not provided, you must generate one using the ObjectAid UML Explorer for Eclipse. Save this diagram as file EmployeeClassDiagram.jpg in your project.
4. In package edu.uprb.company place an application EmployeePayroll that reads a file of employees (employee.txt) and create another file that writes their data with the appropriate format, including their weekly salary.
Solution
- Enumeration (enum) typed named Department: Department.java
- Class named Employee: Employee.java
- Employee Class Diagram: EmployeeClassDiagram.jpg
- Application of Input/Output File EmployeePayroll: EmployeePayroll.java
Figure 1 - Employee Class Diagram
Figure 2 - Employee.txt with data
Figure 3 - Output of the program EmployeePayroll
Figure 4 - Payroll.txt with result data
Conclusion
Finally, Java's support for class, enumerations, and I/O files enhances the language's versatility and popularity in software development. Java classes promote code reuse and modular design by encapsulating data and behavior. Enumerations define constants, improving readability and reducing invalid values. Java's I/O file handling facilitates efficient file management, making it ideal for large data applications.