java代码

io的使用

 package com.tan.io;

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

 class Employee{
     private String name;
     private double salary;
     private Date hireDay;

     public Employee(String name,double salary,int year,int month,int day){
         this.name=name;
         this.salary=salary;
         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 byPersent){
         double raise=salary*byPersent/100;
         salary+=raise;
     }
 }

 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);

         try(PrintWriter out=new PrintWriter("employee.txt","UTF-8")){
             writeData(staff,out);
         }

         try(Scanner in=new Scanner(
                 new FileInputStream("employee.txt"),"UTF-8")){
             Employee[] newStaff=readData(in);
             for(Employee e : newStaff){
                 System.out.println(e);
             }
         }
     }

     private static Employee[] readData(Scanner in) {
         int n=in.nextInt();
         in.nextLine();

         Employee[] employees=new Employee[n];
         for(int i=0;i<3;i++){
             employees[i]=readEmployee(in);
         }
         return employees;
     }

     private static Employee readEmployee(Scanner in) {
         // TODO Auto-generated method stub
         String line=in.nextLine();
         String[] token=line.split("\\|");
         String name=token[0];
         double salary=Double.parseDouble(token[1]);
         int year=Integer.parseInt(token[2]);
         int month=Integer.parseInt(token[3]);
         int day=Integer.parseInt(token[4]);
         return new Employee(name, salary, year, month, day);
     }

     private static void writeData(Employee[] staff, PrintWriter out) {
         // TODO Auto-generated method stub
         out.println(staff.length);
         for(Employee e:staff){
             writeEmployee(out,e);
         }
     }

     private static void writeEmployee(PrintWriter out, Employee e) {
         // TODO Auto-generated method stub
         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));
     }

 }

textFile