* This class contains methods to process arrays of {@link Employee} objects.
 *
 * @author  LiGuoLiang
 * @version  1.0.0
 * @see  Employee
 */
public class  EmployeeArray  {

    /**
     * Creates an array with three objects of class {@link Employee}.
     * <p>
     * The first element of the array is the object
     * <code>first</code>, the second element of the array is
     * the object <code>second</code>, and  the third element of the
     * array is the object <code>third</code>.
     * </p>
     *
     * @param first  a {@link Employee} object.
     * @param second  a {@link Employee} object.
     * @param third  a {@link Employee} object.
     * @return  an array with the objects <code>first</code>,
     *           <code>second</code>, and <code>third</code>.
     */
    public static Employee[] makeArray(Employee  first, Employee  second,
                                       Employee  third)  {


        /* PLACE YOUR CODE HERE */
        Employee[] employee = new Employee[3];
        employee[0] = first;
        employee[1] = second;
        employee[2] = third;

        return employee; // REMOVE; USED SO THIS FILE COMPILES
    }

    /**
     * Creates a new array from the specified array of {@link Employee}
     * objects.
     * <p>
     * The elements in the new array have the same order as those in
     * the specified array.
     * </p>
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @return  a <i>new</i> array of the objects in the specified array.
     */
    public static Employee[] copyArray(Employee[]  array)  {


        /* PLACE YOUR CODE HERE */
        Employee[] employee = new Employee[array.length];
        for(int index=0;index<employee.length;index++) {
            employee[index] = array[index];
        }

        return employee; // REMOVE; USED SO THIS FILE COMPILES
    }


    /**
     * Returns the {@link Employee} object with the specified ID.
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @param id  an employee ID.
     * @return  The {@link Employee} object with the specifed
     *          ID. Returns <code>null</code> if there are no employees
     *          in the specified array with the specifed ID.
     */
    public static Employee getEmployee(Employee[]  array, int id)  {


        /* PLACE YOUR CODE HERE */
        for(int index=0;index<array.length;index++) {
            if(array[index].getId()==id){
                return array[index];
            }
        }
        return null; // REMOVE; USED SO THIS FILE COMPILES
    }

    /**
     * Returns the number of employees whose salary is higher than the specified
     * dollar amount.
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @param amount  a dollar amount.
     * @return  the number of employees whose salary is higher than the
     *          specified dollar amount.
     */
    public static int countHigherSalaries(Employee[]  array, double amount)  {

        /* PLACE YOUR CODE HERE */
        int number = 0;
        for(int index=0;index<array.length;index++) {
            if(array[index].getSalary()>amount) {
                number++;
            }
        }
        return number; // REMOVE; USED SO THIS FILE COMPILES
    }

    /**
     * Returns the sum of the salaries of the employees in the specified
     * array.
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @return  the sum of the salaries of the employees in the specified
     *          array.
     */
    public static double sumSalaries(Employee[]  array)  {


        /* PLACE YOUR CODE HERE */
        double sum = 0.0;
        for(int index=0;index<array.length;index++) {
            sum = sum + array[index].getSalary();
        }
        return sum; // REMOVE; USED SO THIS FILE COMPILES
    }

    /**
     * Obtains the highest salary in the specified array.
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @return  the highest salary in the specified array.
     */
    public static double getHighestSalary(Employee[]  array)  {


        /* PLACE YOUR CODE HERE */
        double highestSalary = 0.0;
        for(int index=0;index<array.length;index++) {
            if(array[index].getSalary()>highestSalary) {
                highestSalary = array[index].getSalary();
            }
        }

        return highestSalary; // REMOVE; USED SO THIS FILE COMPILES
    }

    /**
     * Increases the salary of every employee in the specified array by the
     * specified amount.
     *
     * @param array  an array that contains objects of class {@link Employee}.
     */
    public static void increaseAll(Employee[] array, double amount)  {


        /* PLACE YOUR CODE HERE */
        for(int index=0;index<array.length;index++) {
            array[index].setSalary(array[index].getSalary()+amount);
        }
    }

    /**
     * Returns a string representation of the specified
     * {@link Employee} array.
     * <p>
     * Uses the method <code>toString</code> in class <code>Employee</code>
     * to obtain the string representation of each object in the array.
     * </p>
     * A new line character ( \n ) separates the string representations
     * of each <code>Employee</code> object. For example:
     * </p>
     * <pre>
     * Employee[102,Mary Jones,68250.0]\n
     * Employee[101,Joe Smith,36000.0]\n
     * Employee[103,Richard Wong,92175.0]
     * </pre>
     * <p>
     * Note that the string returned does <i>not</i> end with a new line
     * character (\n).
     * </p>
     * <p>
     * This method assumes that every element in the specified array
     * contains a valid reference to an <code>Employee</code> object.
     * </p>
     *
     * @param array  an array that contains objects of class {@link Employee}.
     * @return  the string representation of the specified array
     */
    public static String displayAll(Employee[]  array)  {


        /* PLACE YOUR CODE HERE */
        String display = "";

        if(array.length!=0) {
            for(int index=0;index<array.length-1;index++) {
                display += array[index].toString()+"\n";
            }
            display += array[array.length-1].toString();
        }

        return display; // REMOVE; USED SO THIS FILE COMPILES
    }
}