employee.java

卡耐基教程SSD3中所有exercise和quiz的全部答案

import java.io.*;
import java.util.*;

/**
 * Models the information of an employee.
 *
 * @author  iCarnegie
 * @version  1.0.0
 */
public class Employee  {

	private static PrintWriter  stdErr =
		new PrintWriter(System.err, true);

	private final static double  SALE_COMMISSION = 0.02;

	private final static String  DATA_DELIM = "_";

	private final static String  SALES_DELIM = ",";

	private String  name;

	private double  earnings;

	/**
	 * Test case for class <code>Employee</code>
	 *
	 * @param args  not used.
	 */
	public static void main(String[] args) {

		String  data = "John Smith_10.00_20_1000.0,100.0,0.0";

		Employee  employee = new Employee(data);

		try {
			if (employee.getEarnings() == 222.0) {
				stdErr.println("Test 1 passed");
			} else {
				stdErr.println("Test 1 failed");
			}
		} catch (NumberFormatException  iae)  {
			stdErr.println("Test 1 failed, " + iae);
		}

		data = "John Smith_10.00_20_1000.0,100.0";

		employee = new Employee(data);

		try {
			if (employee.getEarnings() == 222.0) {
				stdErr.println("Test 2 passed");
			} else {
				stdErr.println("Test 2 failed");
			}
		} catch (NumberFormatException  iae)  {
			stdErr.println("Test 2 failed, " + iae);
		}
	}

	/**
	 * Constructs an <code>Employee</code> object with the
	 * information specified in the parameter <code>data</code>.
	 * <p>
	 * The input data has the following format:
	 * </p>
	 * <p>
	 * name_hourlyWage_hoursWorked_sale1,sale2,...,salen
	 * </p>
	 * <p>
	 * The sale fields store the amount of each sale made by the
	 * employee.
	 * </p>
	 *
	 * @param data  a String with employee information.
	 * @throws NumberFormatException  if data contains invalid
	 *                                numbers
	 */
	public Employee(String data) throws NumberFormatException  {

		StringTokenizer tokenizer =
			new StringTokenizer(data, DATA_DELIM);

		try {
			this.name = tokenizer.nextToken();

			double hourlyWage =
				Double.parseDouble(tokenizer.nextToken());
			int hoursWorked =
				Integer.parseInt(tokenizer.nextToken());

			double commission = (tokenizer.hasMoreTokens()) ?
				computeCommission(tokenizer.nextToken()) : 0;

			this.earnings = hourlyWage * hoursWorked + commission;

		} catch (NumberFormatException  nfe)  {
			throw new NumberFormatException(
				"bad employee data: " + data);
		}
	}

	/**
	 * Obtains the name of the employee.
	 *
	 * @return a String with the name of the employee.
	 */
	public String  getName()  {

		return this.name;
	}

	/**
	 * Obtains the earnings of the employee.
	 *
	 * @return the earnings of the employee.
	 */
	public double  getEarnings()  {

		return this.earnings;
	}

	/*
	 * Computes the commission of the employee with the data
	 * specified in the parameter.
	 *
	 * @param data  a String with the employee's sales data.
	 * @return the commission earned by the employee.
	 * @throws NumberFormatException  if data contains invalid
	 *                                numbers
	 */
	private double  computeCommission(String data)
		throws NumberFormatException {

		StringTokenizer tokenizer =
			new StringTokenizer(data, SALES_DELIM);

		double total = 0.0;

		try {

			String token = tokenizer.nextToken();

			while (tokenizer.hasMoreTokens()) {
				token = tokenizer.nextToken();
				total += Double.parseDouble(token);
			}

		} catch (NumberFormatException  nfe)  {
			throw new NumberFormatException(
				"bad sales data: " + data);
		}

		return total * SALE_COMMISSION;
	}
}