我是照着老师的代码敲的，可是有异常，而且double的值输出的不对，应该是10.5的，请问那位知道哪里错了，求指教...

import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class DosDemo {

	public static void main(String[] args)throws IOException {
		String file="demo/dos.dat";
		DataOutputStream dos=new DataOutputStream(new FileOutputStream(file));
		dos.writeInt(10);
		dos.writeInt(-10);
		dos.writeLong(10l);
		dos.writeDouble(10.5);
		dos.writeUTF("中国");//用utf-8编码显示
		dos.writeChars("中国");//utf-16be
		dos.close();
		IOUtil.printHex(file);
	}

}

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;



public class DisDemo {

	public static void main(String[] args) throws IOException{
		
		String file="demo/dos.dat";
		IOUtil.printHex(file);
		DataInputStream dis=new DataInputStream(new FileInputStream(file));
		
		int i=dis.readInt();
		System.out.println(i);
		i=dis.readInt();
		System.out.println(i);
		long l=dis.readLong();
		System.out.println(l);
		double d=dis.readDouble();
		System.out.println(d);
		String s=dis.readUTF();
		System.out.println(s);
		
		dis.close();
	}

}

结果是这样的：

00 00 00 0a ff ff ff f6 00 00 

00 00 00 00 00 0a 00 06 e4 b8 

ad e5 9b bd 4e 2d 56 fd 10

-10

10

9.58651235932276E-309

Exception in thread "main" java.io.EOFException

at java.io.DataInputStream.readFully(Unknown Source)

at java.io.DataInputStream.readUTF(Unknown Source)

at java.io.DataInputStream.readUTF(Unknown Source)

at javaIO.DisDemo.main(DisDemo.java:25)