Text File Test
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Scanner;
/**
* @version 1.12 2007-06-22
* @author Cay Horstmann
*/
public class TextFileTest
{
public static void main(String[] args)
{
Employee[] staff = new Employee[3];
staff[0] = new Employee("Carl Cracker", 75000, 1987, 12, 15);
staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);
staff[2] = new Employee("Tony Tester", 40000, 1990, 3, 15);
try
{
// save all employee records to the file employee.dat
PrintWriter out = new PrintWriter("employee.dat");
writeData(staff, out);
out.close();
// retrieve all records into a new array
Scanner in = new Scanner(new FileReader("employee.dat"));
Employee[] newStaff = readData(in);
in.close();
// print the newly read employee records
for (Employee e : newStaff)
System.out.println(e);
}
catch (IOException exception)
{
exception.printStackTrace();
}
}
/**
* Writes all employees in an array to a print writer
* @param employees an array of employees
* @param out a print writer
*/
private static void writeData(Employee[] employees, PrintWriter out) throws IOException
{
// write number of employees
out.println(employees.length);
for (Employee e : employees)
e.writeData(out);
}
/**
* Reads an array of employees from a scanner
* @param in the scanner
* @return the array of employees
*/
private static Employee[] readData(Scanner in)
{
// retrieve the array size
int n = in.nextInt();
in.nextLine(); // consume newline
Employee[] employees = new Employee[n];
for (int i = 0; i < n; i++)
{
employees[i] = new Employee();
employees[i].readData(in);
}
return employees;
}
}
class Employee
{
public Employee()
{
}
public Employee(String n, double s, int year, int month, int day)
{
name = n;
salary = s;
GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
hireDay = calendar.getTime();
}
public String getName()
{
return name;
}
public double getSalary()
{
return salary;
}
public Date getHireDay()
{
return hireDay;
}
public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
}
public String toString()
{
return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay
+ "]";
}
/**
* Writes employee data to a print writer
* @param out the print writer
*/
public void writeData(PrintWriter out)
{
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(hireDay);
out.println(name + "|" + salary + "|" + calendar.get(Calendar.YEAR) + "|"
+ (calendar.get(Calendar.MONTH) + 1) + "|" + calendar.get(Calendar.DAY_OF_MONTH));
}
/**
* Reads employee data from a buffered reader
* @param in the scanner
*/
public void readData(Scanner in)
{
String line = in.nextLine();
String[] tokens = line.split("\\|");
name = tokens[0];
salary = Double.parseDouble(tokens[1]);
int y = Integer.parseInt(tokens[2]);
int m = Integer.parseInt(tokens[3]);
int d = Integer.parseInt(tokens[4]);
GregorianCalendar calendar = new GregorianCalendar(y, m - 1, d);
hireDay = calendar.getTime();
}
private String name;
private double salary;
private Date hireDay;
}
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