package cn.stat.p2.demo;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class datastreamdemo {    /**     * @param args     * @throws IOException      */    public static void main(String[] args) throws IOException {        //DataInputStream与DataOutputStream写入数据的同时写入数据类型        writedata();        readdata();    }    public static void readdata() throws IOException {        DataInputStream dis=new DataInputStream(new FileInputStream("data.txt"));        String str=dis.readUTF();        System.out.println(str);                    }    public static void writedata() throws IOException {                DataOutputStream dos=new DataOutputStream(new FileOutputStream("data.txt"));        dos.writeUTF("你好");        dos.close();            }}