通过建立dataoutputstream对象和datainputstream对象，分别将三名学生的基本信息写入到文件当中和从相应的文件当中读取出来.txt

因此本系统的目标就是让顾客方便快捷和满意的购物。为了达到这一目标

import java.io.*;
public class DataStreamDemo
{
 public static void main(String[] args) throws IOException {
   String [] name = {"Liu","Wang","Zhao" };
   int [] age = {20,19,21};
   char [] sex = {'F','M','M'};  
   DataOutputStream dos = new DataOutputStream(new FileOutputStream("StudInfo.dat"));
   DataInputStream dis = new DataInputStream(new FileInputStream("StudInfo.dat"));             
   try{         
      for(int i = 0; i < name.length;i++){ //写入学生信息
dos.writeBytes(name[i]+"\n");
  dos.writeInt(age[i]);   
          dos.writeChar(sex[i]);
       }
       dos.close();  
           
       String sname;
       int sage;
       char ssex;
       char ch;
       while(true){//读取学生信息
          sname = dis.readLine();
          sage = dis.readInt();
          ssex = dis.readChar();
          System.out.println(sname+"  "+sage+"  "+ssex);      
       }  
   }catch (EOFException e) {           
      dis.close();
} 
}//end main
}//end class