毕老师讲解的DataStream中，按照代码写下来有两个问题。我安装的jdk是1.7的。1、writeData方法写出来的不是13个字节，是十个字节。
2、readData方法报异常
Exception in thread "main" java.io.EOFException
at java.io.DataInputStream.readFully(DataInputStream.java:197)
at java.io.DataInputStream.readLong(DataInputStream.java:416)
at java.io.DataInputStream.readDouble(DataInputStream.java:468)
at day21.DataStreamDemo.readData(DataStreamDemo.java:22)
at day21.DataStreamDemo.main(DataStreamDemo.java:13)
代码如下：
import java.io.*;
/*
DataInputStream和DataOutputStream：
可以用作操作基本数据类型数据的流对象。
*/
public class DataStreamDemo {
public static void main(String[] args) throws IOException{
// writeData();
readData();
}
public static void readData() throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("data.txt"));
int num = dis.readInt();
boolean b = dis.readBoolean();
double d = dis.readDouble();
System.out.println(num);
System.out.println(b);
System.out.println(d);
dis.close();
}
public static void writeData() throws IOException
{
DataOutputStream dos = new DataOutputStream(new FileOutputStream("data.txt"));