文件读取异常。请各位帮忙看一下

EmployeeMain.javapackage com.dreamhome.file;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.PrintWriter;import java.util.Scanner;public class EmployeeMain {    /**     * @param args     */    public static void main(String[] args) {        Employee[] staff=new Employee[3];        staff[0]=new Employee("Tom", 562.12, 2012, 3, 21);        staff[1]=new Employee("Tony", 4568, 2012, 2, 21);        staff[2]=new Employee("hu", 562.12, 2012, 1, 21);        try {            PrintWriter out=new PrintWriter("employee.txt");            writeDate(staff, out);            out.close();            Scanner in=new Scanner(new FileReader("employee.txt"));            Employee[] newStaff=readDate(in);            in.close();            for(Employee e : newStaff){                System.out.println(e);            }        } catch (FileNotFoundException e) {            System.out.println("文件不存在");        }    }        private static void writeDate(Employee[] employees,PrintWriter out){        out.println(employees.length);        for (Employee e:employees) {            e.writeData(out);        }    }        private static Employee[] readDate(Scanner in){        int n=in.nextInt();        in.nextLine();        Employee[] employees=new Employee[n];        for (int i = 0; i < n; i++) {            employees[i]=new Employee();            employees[i].readData(in);        }        return employees;    }}