Question

JAVA PROGRAMMING

Create an Employee class which implements Comparable<Employee> The constructor consists of an employee’s first name and an employee’s salary, both of which are instance variables. Create accessor and mutator methods for both of these variables Write an equals method that returns true if the salaries are equal with one cent and the names are exactly equal Write a compareTo method that returns 1 if the salary of this employee is greater than the salary of the comparable, -1 if less than and 0 if equal.

Create a class called PriorityQueueUserDefinedObjectExample Create a Scanner to read from the user input. Create a Scanner and a PrintWriter to read to a file and output to a different file. (note: You should prompt for the names of these files). The input file has a single name followed by a 5 or 6 figure salary on each line. (You can use my empsalaries.txt in the homework for Lesson 7) Create a PriorityQueue Read in and add each employee to the queue Use the remove method as you write the employee and salary to the output file from lowest salary to highest.

Answer 1

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import java.util.PriorityQueue;

public class PriorityQueueUserDefinedObjectExample {

    public static void main(String[] args) {
        PriorityQueue<Employee> employeePriorityQueue = new PriorityQueue<>();

        employeePriorityQueue.add(new Employee("Bob", 200000.00));
        employeePriorityQueue.add(new Employee("John",135000.00));
        employeePriorityQueue.add(new Employee("Jessica",315000.00));
        employeePriorityQueue.add(new Employee("Bebo",267000.00));

        while(!employeePriorityQueue.isEmpty()) {
            System.out.println(employeePriorityQueue.remove());
        }
    }

}
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
import java.util.Objects;

public class Employee implements Comparable<Employee> {
    private String name;
    private double salary;

    public Employee(String name,double salary) {
        this.name = name;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    @Override
    public boolean equals(Object o) {
        if(this == o) return true;
        if(o == null || getClass() != o.getClass()) return false;
        Employee employee = (Employee) o;
        return Double.compare(employee.salary, salary) == 0 && Objects.equals(name,employee.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name,salary);
    }

    @Override

    public String toString() {
        return "Employee{" + "name='" + name + '\'' + ",salary=" + salary + '}';
    }

    @Override
    public int compareTo(Employee employee) {
        if(this.getSalary() > employee.getSalary()) {
            return 1;
        } else if(this.getSalary() < employee.getSalary()) {
            return -1;
        } else {
            return 0;
        }
    }

}