以顺序存取二进制度方式保存下列数据(*.dat),并从该二进制文件中读取数据,将其显示在屏幕上;
以随机存取二进制度方式保存下列数据(*.dat),并从该二进制文件中读取数据,将其显示在屏幕上;
应该用哪几个流呢?

这是我自己写的,是不是哪里错了?

import *;

public class PrintDataFromSbi {

    public static void main(String[] args) {
        int b = 0;
        FileInputStream in =null;
        FileOutputStream out = null;
        DataOutputStream dos = null;
        try {
            in = new FileInputStream ("c:\\student.txt");
            dos = new DataOutputStream(new FileOutputStream("c:\\sbi.dat"));
            while((b = in.read()) != -1){
                dos.writeChar((char)b);
            }
            in.close();
            //out.close();
            dos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}