DataInputStream的readUTF()

Question

public static void main(String[] args) throws Exception
{
        byte b[]="哈哈123".getBytes();
        DataInputStream dis1=new DataInputStream(new ByteArrayInputStream(b));
        try
        {
            System.out.println(dis1.readUTF());
        }
        catch(EOFException ex)
        {
           ex.printStackTrace();
        }
}
想不明白，为何老报：java.io.EOFException
at java.io.DataInputStream.readFully(DataInputStream.java:268)
at java.io.DataInputStream.readUTF(DataInputStream.java:639)
at java.io.DataInputStream.readUTF(DataInputStream.java:610)
at net.TSocket1.main(TSocket1.java:22)

Answer 1

EOFExceptionEOF = End Of File 读到头了不够长

Answer 2

try{
byte b[]="哈哈123".getBytes(); BufferedReader in=new BufferedReader(new InputStreamReader(new ByteArrayInputStream(b),"UTF8"));
System.out.println(in.readLine() );

}catch(Exception e){

}

Answer 3

你自己看一下源代码了解一下读取UTF的时候 具体做了 什么你就清楚了为什么抛出EOFException