Add a public getEmployee method that accepts an integer index and then returns the Employee object found at that index in the collection of employees. Do not forget to add and enforce the precondition(s) on the index. Write unit tests for getEmployee: 1. Any and all precondition checks 2. Border conditions on the parameter 3. Finding the first, last, and middle employee

public class Employee {

private String name;

private int yearOfHire;

private String jobTitle;

private double hourlyWage;

private int rating;

private static final double MINIMUM_WAGE = 7.25;

/**

* Employee default constructor

*

* @precondition none

* @postcondition this.yearOfHire = 1970 && this.hourlyWage = MINIMUM_WAGE

* && this.rating = 1 && this.name == null && this.jobTitle

* == null

*

*

*/

public Employee() {

this.yearOfHire = 1970;

this.hourlyWage = MINIMUM_WAGE;

this.rating = 1;

this.name = null;

this.jobTitle = null;

}

/**

* initializes Employee with specific values.

*

* @precondition name !=null && name.isEmpty()==false. jobTitle !=null &&

* jobTitle.isEmpty()==false. yearOfHire >= 1970. hourlyWage

* >= MIN_WAGE. rating >=1 && rating <= 5.

* @postcondition getName()=name && getYearOfHire()=yearOfHire &&

* getJobTitle()= jobTitle && getHourlyWage()= hourlyWage &&

* getRating()= rating.

* @param name name of employee

* @param yearOfHire year employee got hired

* @param jobTitle title of job

* @param hourlyWage employees hourly wage

* @param rating rating of employee

*

*/

public Employee(String name, int yearOfHire, String jobTitle, double hourlyWage, int rating) {

if (name == null) {

throw new IllegalArgumentException("name cannot be null");

}

if (name.isEmpty()) {

throw new IllegalArgumentException("name cannot be empty");

}

if (rating < 1 || rating > 5) {

throw new IllegalArgumentException("rating must be between 1 and 5 inclusive");

}

this.name = name;

this.yearOfHire = yearOfHire;

this.jobTitle = jobTitle;

this.hourlyWage = hourlyWage;

this.rating = rating;

}

/**

* Gets the name of the Employee.

*

*

* @return the name of the Employee

*/

public String getName() {

return this.name;

}

/**

* Gets year of hire for the employee.

*

* @return the year that the employee was hired.

*/

public int getYearOfHire() {

return this.yearOfHire;

}

/**

* Gets the hourly wage for the employee.

*

* @return the hourly wage for the employee.

*/

public double getHourlyWage() {

return this.hourlyWage;

}

/**

* Sets the hourly wage for the employee.

*

* @precondition hourlyWage >= MIN_WAGE

* @postcondition gethourlyWage()=hourlyWage

*

* @param hourlyWage

* The hourlyWage for the employee

*/

public void setHourlyWage(double hourlyWage) {

if (hourlyWage < MINIMUM_WAGE) {

throw new IllegalArgumentException("HourlyWage should be MINIMUM_WAGE");

}

this.hourlyWage = MINIMUM_WAGE;

}

/**

* Gets the job title.

*

* @return the job title.

*/

public String getJobTitle() {

return this.jobTitle;

}

/**

* Sets the job title.

*

* @precondition jobTitle != null && jobTitle.isEmpty()==false.

* @postcondition getjobTitle()= jobTitle

*

* @param jobTitle

* The jobTitle for the employee

*

*/

public void setJobTitle(String jobTitle) {

if (jobTitle == null) {

throw new IllegalArgumentException("Job title cannot be null");

}

if (jobTitle.isEmpty()) {

throw new IllegalArgumentException("Job title cannot be empty");

}

this.jobTitle = jobTitle;

}

/**

* Gets the rating.

*

* @return the rating

*/

public int getRating() {

return this.rating;

}

/**

* Sets the rating.

*

* @precondition rating >=1 && rating <= 5

* @postcondition getRating()= rating

*

* @param rating

* The rating of the employee

*/

public void setRating(int rating) {

if (rating < 1 || rating > 5) {

throw new IllegalArgumentException("Rating must be between 1 and 5 inclusively");

}

this.rating = rating;

}

@Override

public String toString() {

return "Employee [name=" + name + ", yearOfHire=" + yearOfHire + ", jobTitle=" + jobTitle + ", hourlyWage="

+ hourlyWage + ", rating=" + rating + "]";

}

}