In this assignment, you are to create a class named Payroll. In the class, you are to have the following data members: name: Str
ing id: String hours: int rate: double private members . You are to create no-arg and parameterized constructors and the appropriate setters(accessors) and getters (mutators). The class definition should also handle the following exceptions: An employee name should not be empty, otherwise an exception should be thrown. An employee id should have the form LNN. If that form is not received, an exception should be thrown. An employee's hours should neither be negative nor greater than 84. An exception should be thrown otherwise. An employee's pay rate should neither be negative nor greater than 25.00. An exception should be thrown otherwise. Demonstrate this class in a program (separate class or in the same class). The exception messages should be appropriate to the specific exception that has occurred. Create a package payroll for the project.
1 answer:
Answer:
Here is the PayRoll class:
// PayRoll.java
package payroll; // creates payroll package for project
public class Payroll { //class definition
private String name; //private String type member variable to store name
private String id; //private String type member variable to store id
private int hours; //private int type member variable to store work hours
private double rate; //private double type member variable to store payrate of the employee
public Payroll() { //no argument constructor of PayRoll
name = ""; //initialize name field
id = ""; //initialize id field
hours = 0; //initialize hours field
rate = 0.0; } // initialize rate field
public Payroll(String NAME, String ID, int HOURS, double RATE) { //parameterized constructor
setName(NAME); //sets name value
setId(ID); //sets id value
setHours(HOURS); //sets hours value
setRate(RATE); } //sets rate value
public void setName(String NAME) { //mutator method to set name
if(NAME.equals("")) { //if name field is empty
throw new IllegalArgumentException("An employee name should not be empty."); } //throws exception
name = NAME; }
public void setId(String ID) { //mutator method to set id
if(ID.length() != 3 || !Character.isLetter(ID.charAt(0))|| !Character.isDigit(ID.charAt(1)) || !Character.isDigit(ID.charAt(2))) { //if statement checks if the length of the id is not 3, or first character of id is not a letter, or second or third character of id is not a digit
throw new IllegalArgumentException("An employee id should have the form LNN."); } //throws exception
id = ID; }
public void setHours(int HOURS) { //mutator method to set hours
if(HOURS < 0 || HOURS > 84) { //checks if working hours are less than 0 or greater than 84
throw new IllegalArgumentException("An employee's hours should neither be negative nor greater than 84"); } //throws exception
hours = HOURS; }
public void setRate(double RATE) { //mutator method to set rate
if(RATE < 0 || RATE > 25.00) { //checks if pay rate is less than 0 or greater than 25.00
throw new IllegalArgumentException("An employee's pay rate should neither be negative nor greater than 25.00"); } //throws exception
rate = RATE; }
public String getName() { //accessor method to get value of name
return name; } //returns the current value of name
public String getId() { //accessor method to get value of id
return id; } //returns the current value of id
public int getHours() { //accessor method to get value of hours
return hours; } //returns the current value of hours
public double getRate() { //accessor method to get value of rate
return rate; } } //returns the current value of rate
Explanation:
Here is the Main() class:
import java.util.Scanner; //to accept input from user
public class Main { //Main class definition
public static void main(String[] args) {//start of main() function
Payroll pay = new Payroll(); //creates object i.e. pay of PayRoll class
Scanner sc = new Scanner(System.in); //creates Scanner class object
String name,id; //declare variables to hold name and id
int hour; //declare variable to store hour
double rate; //declare variable to store pay rate
System.out.print("Enter the employee's name: "); //prompts user to enter employee name
name = sc.nextLine(); //reads input value of name
pay.setName(name); //use pay object to access mutator method to set name to input name value
System.out.print("Enter employee's id (LNN form): "); //prompts user to enter employee id
id = sc.nextLine(); //reads input value of id
pay.setId(id); //use pay object to access mutator method to set id to input id
System.out.print("Enter the employee's working hours: "); //prompts user to enter employee hours
hour = sc.nextInt(); //reads input value of hour
pay.setHours(hour); // set input hours
System.out.print("Enter the employee's pay rate: "); //prompts user to enter employee pay rate
rate = sc.nextInt(); //reads input value of rate
pay.setRate(rate); // set pay rate
System.out.println("Employee Data: \n"); //displays the employee data
System.out.println("Employee's Name: " + pay.getName()); //calls getName accessor method to get current value of name field and display it
System.out.println("Employee's ID: " + pay.getId()); //calls getId accessor method to get current value of id field and displays it
System.out.println("Employee's Hours: " + pay.getHours()); //calls getHours accessor method to get current value of hours field and displays it
System.out.println("Employee's Pay Rate: " + pay.getRate()); //calls getRate accessor method to get current value of rate field and displays it
}
}
Here IllegalArgumentException is thrown which is used to show that a method is passed an illegal argument.
The screenshot of program and its output is attached.
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