package textFile; import java.io.*; import java.util.*; /** * @version 1.13 2012-05-30 * @author Cay Horstmann */ public class TextFileTest { public static void main(String[] args) throws IOException { 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); // save all employee records to the file employee.dat try (PrintWriter out = new PrintWriter("employee.dat", "UTF-8")) { writeData(staff, out); } // retrieve all records into a new array try (Scanner in = new Scanner( new FileInputStream("employee.dat"), "UTF-8")) { Employee[] newStaff = readData(in); // print the newly read employee records for (Employee e : newStaff) System.out.println(e); } } /** * 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) writeEmployee(out, e); } /** * 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] = readEmployee(in); } return employees; } /** * Writes employee data to a print writer * @param out the print writer */ public static void writeEmployee(PrintWriter out, Employee e) { GregorianCalendar calendar = new GregorianCalendar(); calendar.setTime(e.getHireDay()); out.println(e.getName() + "|" + e.getSalary() + "|" + 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 static Employee readEmployee(Scanner in) { String line = in.nextLine(); String[] tokens = line.split("\\|"); String name = tokens[0]; double salary = Double.parseDouble(tokens[1]); int year = Integer.parseInt(tokens[2]); int month = Integer.parseInt(tokens[3]); int day = Integer.parseInt(tokens[4]); return new Employee(name, salary, year, month, day); } }