/** Instance: a person's name, year hired, and salary */
public class Employee {
    private String name;      // Employee's name; cannot be null or empty
    private int start;        // Year hired; -1 if undefined
    private double salary;    // Salary.  Must be >= 0
    
    /** 
     * Constructor: a person with name n, year hired d, salary s 
     * Preconditions: n is neither empty nor null
     *                d is > 1970 or -1 if undefined
     *                s is >= 0
     */
    public Employee(String n, int d, double s) {
        name   = n;
        start  = d;
        salary = s;
    }
    
    /** 
     * Constructor: a person with name n, year hired d,
     * salary 50,000 
     */
    public Employee(String n, int d) {
        this(n, d, 50000.0);
        /*
        name= n;
        start= d;
        salary= 50000;
        */
    }

    /** 
     * Constructor: a person with name "<unknown>":, year 2012,
     * and salary 0 
     */
   public Employee() {
        this("<unknown>", 2010, 0.0);
    }
    
    /** Yields: name of this Employee */
    public String getName() {
        return name; 
    }
    
    /** 
     * Set the name of this Employee to n 
     * Precondition: n is neither empty nor null
     */
    public void setName(String n)  { 
        name= n; 
    }
    
    /** Yields: year this Employee was hired */
    public int getStart() { 
        return start; 
    }
    
    /** 
     * Set the year this Employee was hired to y 
     * Precondition: y is > 1970 or -1 if undefined
     */
    public void setStart(int y) { 
        start= y; 
    }
    
    /** = Employee's total compensation (here, the salary) */
    public double getCompensation() { 
        return salary; 
    }
    
    /** 
     * Change this EmployeeÕs salary to d 
  * Precondition: d >= 0 d  
  */
    public void changeSalary(double d)  { 
        this.salary= d; 
    }
    
    /** Yields: String representation of this Employee */
    public String toString() {
        return this.getName() + ", year " + getStart() + ", salary " + salary ; 
    }
    
    /** Yields: toString value from superclass */
    public String toStringUp() {
        return super.toString();
    }
    
    /** Yields: Òe is an Employee, with the same fields as this Employee */
    public boolean equals(Employee e) {
        return e != null
            &&  this.name.equals(e.name)
            &&  this.start == e.start
            &&  this.salary == e.salary;
    }
    
    /** Yields: equals from Object class */
    public boolean equalsUp(Employee e) {
     return super.equals(e);
    }

    
 
}