把数据+类型写入字节数组里这个程序总错，求大神指出错的地方，或者给出正确的代码，感激不尽

package 处理流;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

public class Demo02 {
public static void main(String[] args) throws IOException{
read(write());
}
//把数据+类型写到字节数组里
public static byte[] write()throws IOException
{
byte[] b2=null;
ByteArrayOutputStream dos=new ByteArrayOutputStream();
DataOutputStream out=new DataOutputStream(
new BufferedOutputStream(dos));
double point=3.14159;
int num=2628;
String str="我是汪洋";
String str02="刘林是我同学";
out.writeDouble(point);
out.writeInt(num);
out.writeUTF(str);
out.writeUTF(str02);
dos.flush();
b2=dos.toByteArray();

    return b2;
}
//从字节数组中获得数据+类型
public static void read(byte[] b2)throws IOException
{
    DataInputStream into=new DataInputStream(
            new BufferedInputStream(
                    new ByteArrayInputStream(b2)));
    System.out.println("point="+into.readDouble());
    System.out.println("num="+into.readInt());
    System.out.println("str="+into.readUTF());
    System.out.println("str02="+into.readUTF());
}

}

out.writeUTF(str02);
out.flush();//加上这句，把流输出到dos
dos.flush();

粘贴的时候重复了一片，大神们不要介意

请粘贴异常信息，你这样总不能让我拿去运行看看吧，浪费时间

用ultraedit看下。文件写入正确了么

将这句修改了就好了：
DataOutputStream out=new DataOutputStream(dos);

    然后就正常了，完整代码：

            public static void main(String []args){
        try {
            read(write());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
    }

    //把数据+类型写到字节数组里
    public static byte[] write()throws IOException
    {
        byte[] b2=null; 
        ByteArrayOutputStream dos=new ByteArrayOutputStream();
        DataOutputStream out=new DataOutputStream(dos);
        double point=3.14159;
        int num=2628;
        String str="我是汪洋";
        String str02="刘林是我同学";
        out.writeDouble(point);
        out.writeInt(num);
        out.writeUTF(str);
        out.writeUTF(str02);
        dos.flush();
        b2=dos.toByteArray();
        return b2;
    }
    //从字节数组中获得数据+类型
    public static void read(byte[] b2)throws IOException
    {
        DataInputStream into=new DataInputStream(
                new BufferedInputStream(
                        new ByteArrayInputStream(b2)));
        System.out.println("point="+into.readDouble());
        System.out.println("num="+into.readInt());
        System.out.println("str="+into.readUTF());
        System.out.println("str02="+into.readUTF());
    }