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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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1+/*
2+ * Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+package java.io;
27+
28+/**
29+ * The <code>DataInput</code> interface provides
30+ * for reading bytes from a binary stream and
31+ * reconstructing from them data in any of
32+ * the Java primitive types. There is also
33+ * a
34+ * facility for reconstructing a <code>String</code>
35+ * from data in
36+ * <a href="#modified-utf-8">modified UTF-8</a>
37+ * format.
38+ * <p>
39+ * It is generally true of all the reading
40+ * routines in this interface that if end of
41+ * file is reached before the desired number
42+ * of bytes has been read, an <code>EOFException</code>
43+ * (which is a kind of <code>IOException</code>)
44+ * is thrown. If any byte cannot be read for
45+ * any reason other than end of file, an <code>IOException</code>
46+ * other than <code>EOFException</code> is
47+ * thrown. In particular, an <code>IOException</code>
48+ * may be thrown if the input stream has been
49+ * closed.
50+ *
51+ * <h4><a name="modified-utf-8">Modified UTF-8</a></h4>
52+ * <p>
53+ * Implementations of the DataInput and DataOutput interfaces represent
54+ * Unicode strings in a format that is a slight modification of UTF-8.
55+ * (For information regarding the standard UTF-8 format, see section
56+ * <i>3.9 Unicode Encoding Forms</i> of <i>The Unicode Standard, Version
57+ * 4.0</i>).
58+ * Note that in the following tables, the most significant bit appears in the
59+ * far left-hand column.
60+ * <p>
61+ * All characters in the range <code>'&#92;u0001'</code> to
62+ * <code>'&#92;u007F'</code> are represented by a single byte:
63+ *
64+ * <blockquote>
65+ * <table border="1" cellspacing="0" cellpadding="8" width="50%"
66+ * summary="Bit values and bytes">
67+ * <tr>
68+ * <td></td>
69+ * <th id="bit">Bit Values</th>
70+ * </tr>
71+ * <tr>
72+ * <th id="byte1">Byte 1</th>
73+ * <td>
74+ * <table border="1" cellspacing="0" width="100%">
75+ * <tr>
76+ * <td width="12%"><center>0</center>
77+ * <td colspan="7"><center>bits 6-0</center>
78+ * </tr>
79+ * </table>
80+ * </td>
81+ * </tr>
82+ * </table>
83+ * </blockquote>
84+ *
85+ * <p>
86+ * The null character <code>'&#92;u0000'</code> and characters in the
87+ * range <code>'&#92;u0080'</code> to <code>'&#92;u07FF'</code> are
88+ * represented by a pair of bytes:
89+ *
90+ * <blockquote>
91+ * <table border="1" cellspacing="0" cellpadding="8" width="50%"
92+ * summary="Bit values and bytes">
93+ * <tr>
94+ * <td></td>
95+ * <th id="bit">Bit Values</th>
96+ * </tr>
97+ * <tr>
98+ * <th id="byte1">Byte 1</th>
99+ * <td>
100+ * <table border="1" cellspacing="0" width="100%">
101+ * <tr>
102+ * <td width="12%"><center>1</center>
103+ * <td width="13%"><center>1</center>
104+ * <td width="12%"><center>0</center>
105+ * <td colspan="5"><center>bits 10-6</center>
106+ * </tr>
107+ * </table>
108+ * </td>
109+ * </tr>
110+ * <tr>
111+ * <th id="byte2">Byte 2</th>
112+ * <td>
113+ * <table border="1" cellspacing="0" width="100%">
114+ * <tr>
115+ * <td width="12%"><center>1</center>
116+ * <td width="13%"><center>0</center>
117+ * <td colspan="6"><center>bits 5-0</center>
118+ * </tr>
119+ * </table>
120+ * </td>
121+ * </tr>
122+ * </table>
123+ * </blockquote>
124+ *
125+ * <br>
126+ * <code>char</code> values in the range <code>'&#92;u0800'</code> to
127+ * <code>'&#92;uFFFF'</code> are represented by three bytes:
128+ *
129+ * <blockquote>
130+ * <table border="1" cellspacing="0" cellpadding="8" width="50%"
131+ * summary="Bit values and bytes">
132+ * <tr>
133+ * <td></td>
134+ * <th id="bit">Bit Values</th>
135+ * </tr>
136+ * <tr>
137+ * <th id="byte1">Byte 1</th>
138+ * <td>
139+ * <table border="1" cellspacing="0" width="100%">
140+ * <tr>
141+ * <td width="12%"><center>1</center>
142+ * <td width="13%"><center>1</center>
143+ * <td width="12%"><center>1</center>
144+ * <td width="13%"><center>0</center>
145+ * <td colspan="4"><center>bits 15-12</center>
146+ * </tr>
147+ * </table>
148+ * </td>
149+ * </tr>
150+ * <tr>
151+ * <th id="byte2">Byte 2</th>
152+ * <td>
153+ * <table border="1" cellspacing="0" width="100%">
154+ * <tr>
155+ * <td width="12%"><center>1</center>
156+ * <td width="13%"><center>0</center>
157+ * <td colspan="6"><center>bits 11-6</center>
158+ * </tr>
159+ * </table>
160+ * </td>
161+ * </tr>
162+ * <tr>
163+ * <th id="byte3">Byte 3</th>
164+ * <td>
165+ * <table border="1" cellspacing="0" width="100%">
166+ * <tr>
167+ * <td width="12%"><center>1</center>
168+ * <td width="13%"><center>0</center>
169+ * <td colspan="6"><center>bits 5-0</center>
170+ * </tr>
171+ * </table>
172+ * </td>
173+ * </tr>
174+ * </table>
175+ * </blockquote>
176+ *
177+ * <p>
178+ * The differences between this format and the
179+ * standard UTF-8 format are the following:
180+ * <ul>
181+ * <li>The null byte <code>'&#92;u0000'</code> is encoded in 2-byte format
182+ * rather than 1-byte, so that the encoded strings never have
183+ * embedded nulls.
184+ * <li>Only the 1-byte, 2-byte, and 3-byte formats are used.
185+ * <li><a href="../lang/Character.html#unicode">Supplementary characters</a>
186+ * are represented in the form of surrogate pairs.
187+ * </ul>
188+ * @author Frank Yellin
189+ * @see java.io.DataInputStream
190+ * @see java.io.DataOutput
191+ * @since JDK1.0
192+ */
193+public
194+interface DataInput {
195+ /**
196+ * Reads some bytes from an input
197+ * stream and stores them into the buffer
198+ * array <code>b</code>. The number of bytes
199+ * read is equal
200+ * to the length of <code>b</code>.
201+ * <p>
202+ * This method blocks until one of the
203+ * following conditions occurs:<p>
204+ * <ul>
205+ * <li><code>b.length</code>
206+ * bytes of input data are available, in which
207+ * case a normal return is made.
208+ *
209+ * <li>End of
210+ * file is detected, in which case an <code>EOFException</code>
211+ * is thrown.
212+ *
213+ * <li>An I/O error occurs, in
214+ * which case an <code>IOException</code> other
215+ * than <code>EOFException</code> is thrown.
216+ * </ul>
217+ * <p>
218+ * If <code>b</code> is <code>null</code>,
219+ * a <code>NullPointerException</code> is thrown.
220+ * If <code>b.length</code> is zero, then
221+ * no bytes are read. Otherwise, the first
222+ * byte read is stored into element <code>b[0]</code>,
223+ * the next one into <code>b[1]</code>, and
224+ * so on.
225+ * If an exception is thrown from
226+ * this method, then it may be that some but
227+ * not all bytes of <code>b</code> have been
228+ * updated with data from the input stream.
229+ *
230+ * @param b the buffer into which the data is read.
231+ * @exception EOFException if this stream reaches the end before reading
232+ * all the bytes.
233+ * @exception IOException if an I/O error occurs.
234+ */
235+ void readFully(byte b[]) throws IOException;
236+
237+ /**
238+ *
239+ * Reads <code>len</code>
240+ * bytes from
241+ * an input stream.
242+ * <p>
243+ * This method
244+ * blocks until one of the following conditions
245+ * occurs:<p>
246+ * <ul>
247+ * <li><code>len</code> bytes
248+ * of input data are available, in which case
249+ * a normal return is made.
250+ *
251+ * <li>End of file
252+ * is detected, in which case an <code>EOFException</code>
253+ * is thrown.
254+ *
255+ * <li>An I/O error occurs, in
256+ * which case an <code>IOException</code> other
257+ * than <code>EOFException</code> is thrown.
258+ * </ul>
259+ * <p>
260+ * If <code>b</code> is <code>null</code>,
261+ * a <code>NullPointerException</code> is thrown.
262+ * If <code>off</code> is negative, or <code>len</code>
263+ * is negative, or <code>off+len</code> is
264+ * greater than the length of the array <code>b</code>,
265+ * then an <code>IndexOutOfBoundsException</code>
266+ * is thrown.
267+ * If <code>len</code> is zero,
268+ * then no bytes are read. Otherwise, the first
269+ * byte read is stored into element <code>b[off]</code>,
270+ * the next one into <code>b[off+1]</code>,
271+ * and so on. The number of bytes read is,
272+ * at most, equal to <code>len</code>.
273+ *
274+ * @param b the buffer into which the data is read.
275+ * @param off an int specifying the offset into the data.
276+ * @param len an int specifying the number of bytes to read.
277+ * @exception EOFException if this stream reaches the end before reading
278+ * all the bytes.
279+ * @exception IOException if an I/O error occurs.
280+ */
281+ void readFully(byte b[], int off, int len) throws IOException;
282+
283+ /**
284+ * Makes an attempt to skip over
285+ * <code>n</code> bytes
286+ * of data from the input
287+ * stream, discarding the skipped bytes. However,
288+ * it may skip
289+ * over some smaller number of
290+ * bytes, possibly zero. This may result from
291+ * any of a
292+ * number of conditions; reaching
293+ * end of file before <code>n</code> bytes
294+ * have been skipped is
295+ * only one possibility.
296+ * This method never throws an <code>EOFException</code>.
297+ * The actual
298+ * number of bytes skipped is returned.
299+ *
300+ * @param n the number of bytes to be skipped.
301+ * @return the number of bytes actually skipped.
302+ * @exception IOException if an I/O error occurs.
303+ */
304+ int skipBytes(int n) throws IOException;
305+
306+ /**
307+ * Reads one input byte and returns
308+ * <code>true</code> if that byte is nonzero,
309+ * <code>false</code> if that byte is zero.
310+ * This method is suitable for reading
311+ * the byte written by the <code>writeBoolean</code>
312+ * method of interface <code>DataOutput</code>.
313+ *
314+ * @return the <code>boolean</code> value read.
315+ * @exception EOFException if this stream reaches the end before reading
316+ * all the bytes.
317+ * @exception IOException if an I/O error occurs.
318+ */
319+ boolean readBoolean() throws IOException;
320+
321+ /**
322+ * Reads and returns one input byte.
323+ * The byte is treated as a signed value in
324+ * the range <code>-128</code> through <code>127</code>,
325+ * inclusive.
326+ * This method is suitable for
327+ * reading the byte written by the <code>writeByte</code>
328+ * method of interface <code>DataOutput</code>.
329+ *
330+ * @return the 8-bit value read.
331+ * @exception EOFException if this stream reaches the end before reading
332+ * all the bytes.
333+ * @exception IOException if an I/O error occurs.
334+ */
335+ byte readByte() throws IOException;
336+
337+ /**
338+ * Reads one input byte, zero-extends
339+ * it to type <code>int</code>, and returns
340+ * the result, which is therefore in the range
341+ * <code>0</code>
342+ * through <code>255</code>.
343+ * This method is suitable for reading
344+ * the byte written by the <code>writeByte</code>
345+ * method of interface <code>DataOutput</code>
346+ * if the argument to <code>writeByte</code>
347+ * was intended to be a value in the range
348+ * <code>0</code> through <code>255</code>.
349+ *
350+ * @return the unsigned 8-bit value read.
351+ * @exception EOFException if this stream reaches the end before reading
352+ * all the bytes.
353+ * @exception IOException if an I/O error occurs.
354+ */
355+ int readUnsignedByte() throws IOException;
356+
357+ /**
358+ * Reads two input bytes and returns
359+ * a <code>short</code> value. Let <code>a</code>
360+ * be the first byte read and <code>b</code>
361+ * be the second byte. The value
362+ * returned
363+ * is:
364+ * <p><pre><code>(short)((a &lt;&lt; 8) | (b &amp; 0xff))
365+ * </code></pre>
366+ * This method
367+ * is suitable for reading the bytes written
368+ * by the <code>writeShort</code> method of
369+ * interface <code>DataOutput</code>.
370+ *
371+ * @return the 16-bit value read.
372+ * @exception EOFException if this stream reaches the end before reading
373+ * all the bytes.
374+ * @exception IOException if an I/O error occurs.
375+ */
376+ short readShort() throws IOException;
377+
378+ /**
379+ * Reads two input bytes and returns
380+ * an <code>int</code> value in the range <code>0</code>
381+ * through <code>65535</code>. Let <code>a</code>
382+ * be the first byte read and
383+ * <code>b</code>
384+ * be the second byte. The value returned is:
385+ * <p><pre><code>(((a &amp; 0xff) &lt;&lt; 8) | (b &amp; 0xff))
386+ * </code></pre>
387+ * This method is suitable for reading the bytes
388+ * written by the <code>writeShort</code> method
389+ * of interface <code>DataOutput</code> if
390+ * the argument to <code>writeShort</code>
391+ * was intended to be a value in the range
392+ * <code>0</code> through <code>65535</code>.
393+ *
394+ * @return the unsigned 16-bit value read.
395+ * @exception EOFException if this stream reaches the end before reading
396+ * all the bytes.
397+ * @exception IOException if an I/O error occurs.
398+ */
399+ int readUnsignedShort() throws IOException;
400+
401+ /**
402+ * Reads two input bytes and returns a <code>char</code> value.
403+ * Let <code>a</code>
404+ * be the first byte read and <code>b</code>
405+ * be the second byte. The value
406+ * returned is:
407+ * <p><pre><code>(char)((a &lt;&lt; 8) | (b &amp; 0xff))
408+ * </code></pre>
409+ * This method
410+ * is suitable for reading bytes written by
411+ * the <code>writeChar</code> method of interface
412+ * <code>DataOutput</code>.
413+ *
414+ * @return the <code>char</code> value read.
415+ * @exception EOFException if this stream reaches the end before reading
416+ * all the bytes.
417+ * @exception IOException if an I/O error occurs.
418+ */
419+ char readChar() throws IOException;
420+
421+ /**
422+ * Reads four input bytes and returns an
423+ * <code>int</code> value. Let <code>a-d</code>
424+ * be the first through fourth bytes read. The value returned is:
425+ * <p><pre>
426+ * <code>
427+ * (((a &amp; 0xff) &lt;&lt; 24) | ((b &amp; 0xff) &lt;&lt; 16) |
428+ * &#32;((c &amp; 0xff) &lt;&lt; 8) | (d &amp; 0xff))
429+ * </code></pre>
430+ * This method is suitable
431+ * for reading bytes written by the <code>writeInt</code>
432+ * method of interface <code>DataOutput</code>.
433+ *
434+ * @return the <code>int</code> value read.
435+ * @exception EOFException if this stream reaches the end before reading
436+ * all the bytes.
437+ * @exception IOException if an I/O error occurs.
438+ */
439+ int readInt() throws IOException;
440+
441+ /**
442+ * Reads eight input bytes and returns
443+ * a <code>long</code> value. Let <code>a-h</code>
444+ * be the first through eighth bytes read.
445+ * The value returned is:
446+ * <p><pre> <code>
447+ * (((long)(a &amp; 0xff) &lt;&lt; 56) |
448+ * ((long)(b &amp; 0xff) &lt;&lt; 48) |
449+ * ((long)(c &amp; 0xff) &lt;&lt; 40) |
450+ * ((long)(d &amp; 0xff) &lt;&lt; 32) |
451+ * ((long)(e &amp; 0xff) &lt;&lt; 24) |
452+ * ((long)(f &amp; 0xff) &lt;&lt; 16) |
453+ * ((long)(g &amp; 0xff) &lt;&lt; 8) |
454+ * ((long)(h &amp; 0xff)))
455+ * </code></pre>
456+ * <p>
457+ * This method is suitable
458+ * for reading bytes written by the <code>writeLong</code>
459+ * method of interface <code>DataOutput</code>.
460+ *
461+ * @return the <code>long</code> value read.
462+ * @exception EOFException if this stream reaches the end before reading
463+ * all the bytes.
464+ * @exception IOException if an I/O error occurs.
465+ */
466+ long readLong() throws IOException;
467+
468+ /**
469+ * Reads four input bytes and returns
470+ * a <code>float</code> value. It does this
471+ * by first constructing an <code>int</code>
472+ * value in exactly the manner
473+ * of the <code>readInt</code>
474+ * method, then converting this <code>int</code>
475+ * value to a <code>float</code> in
476+ * exactly the manner of the method <code>Float.intBitsToFloat</code>.
477+ * This method is suitable for reading
478+ * bytes written by the <code>writeFloat</code>
479+ * method of interface <code>DataOutput</code>.
480+ *
481+ * @return the <code>float</code> value read.
482+ * @exception EOFException if this stream reaches the end before reading
483+ * all the bytes.
484+ * @exception IOException if an I/O error occurs.
485+ */
486+ float readFloat() throws IOException;
487+
488+ /**
489+ * Reads eight input bytes and returns
490+ * a <code>double</code> value. It does this
491+ * by first constructing a <code>long</code>
492+ * value in exactly the manner
493+ * of the <code>readlong</code>
494+ * method, then converting this <code>long</code>
495+ * value to a <code>double</code> in exactly
496+ * the manner of the method <code>Double.longBitsToDouble</code>.
497+ * This method is suitable for reading
498+ * bytes written by the <code>writeDouble</code>
499+ * method of interface <code>DataOutput</code>.
500+ *
501+ * @return the <code>double</code> value read.
502+ * @exception EOFException if this stream reaches the end before reading
503+ * all the bytes.
504+ * @exception IOException if an I/O error occurs.
505+ */
506+ double readDouble() throws IOException;
507+
508+ /**
509+ * Reads the next line of text from the input stream.
510+ * It reads successive bytes, converting
511+ * each byte separately into a character,
512+ * until it encounters a line terminator or
513+ * end of
514+ * file; the characters read are then
515+ * returned as a <code>String</code>. Note
516+ * that because this
517+ * method processes bytes,
518+ * it does not support input of the full Unicode
519+ * character set.
520+ * <p>
521+ * If end of file is encountered
522+ * before even one byte can be read, then <code>null</code>
523+ * is returned. Otherwise, each byte that is
524+ * read is converted to type <code>char</code>
525+ * by zero-extension. If the character <code>'\n'</code>
526+ * is encountered, it is discarded and reading
527+ * ceases. If the character <code>'\r'</code>
528+ * is encountered, it is discarded and, if
529+ * the following byte converts &#32;to the
530+ * character <code>'\n'</code>, then that is
531+ * discarded also; reading then ceases. If
532+ * end of file is encountered before either
533+ * of the characters <code>'\n'</code> and
534+ * <code>'\r'</code> is encountered, reading
535+ * ceases. Once reading has ceased, a <code>String</code>
536+ * is returned that contains all the characters
537+ * read and not discarded, taken in order.
538+ * Note that every character in this string
539+ * will have a value less than <code>&#92;u0100</code>,
540+ * that is, <code>(char)256</code>.
541+ *
542+ * @return the next line of text from the input stream,
543+ * or <CODE>null</CODE> if the end of file is
544+ * encountered before a byte can be read.
545+ * @exception IOException if an I/O error occurs.
546+ */
547+ String readLine() throws IOException;
548+
549+ /**
550+ * Reads in a string that has been encoded using a
551+ * <a href="#modified-utf-8">modified UTF-8</a>
552+ * format.
553+ * The general contract of <code>readUTF</code>
554+ * is that it reads a representation of a Unicode
555+ * character string encoded in modified
556+ * UTF-8 format; this string of characters
557+ * is then returned as a <code>String</code>.
558+ * <p>
559+ * First, two bytes are read and used to
560+ * construct an unsigned 16-bit integer in
561+ * exactly the manner of the <code>readUnsignedShort</code>
562+ * method . This integer value is called the
563+ * <i>UTF length</i> and specifies the number
564+ * of additional bytes to be read. These bytes
565+ * are then converted to characters by considering
566+ * them in groups. The length of each group
567+ * is computed from the value of the first
568+ * byte of the group. The byte following a
569+ * group, if any, is the first byte of the
570+ * next group.
571+ * <p>
572+ * If the first byte of a group
573+ * matches the bit pattern <code>0xxxxxxx</code>
574+ * (where <code>x</code> means "may be <code>0</code>
575+ * or <code>1</code>"), then the group consists
576+ * of just that byte. The byte is zero-extended
577+ * to form a character.
578+ * <p>
579+ * If the first byte
580+ * of a group matches the bit pattern <code>110xxxxx</code>,
581+ * then the group consists of that byte <code>a</code>
582+ * and a second byte <code>b</code>. If there
583+ * is no byte <code>b</code> (because byte
584+ * <code>a</code> was the last of the bytes
585+ * to be read), or if byte <code>b</code> does
586+ * not match the bit pattern <code>10xxxxxx</code>,
587+ * then a <code>UTFDataFormatException</code>
588+ * is thrown. Otherwise, the group is converted
589+ * to the character:<p>
590+ * <pre><code>(char)(((a&amp; 0x1F) &lt;&lt; 6) | (b &amp; 0x3F))
591+ * </code></pre>
592+ * If the first byte of a group
593+ * matches the bit pattern <code>1110xxxx</code>,
594+ * then the group consists of that byte <code>a</code>
595+ * and two more bytes <code>b</code> and <code>c</code>.
596+ * If there is no byte <code>c</code> (because
597+ * byte <code>a</code> was one of the last
598+ * two of the bytes to be read), or either
599+ * byte <code>b</code> or byte <code>c</code>
600+ * does not match the bit pattern <code>10xxxxxx</code>,
601+ * then a <code>UTFDataFormatException</code>
602+ * is thrown. Otherwise, the group is converted
603+ * to the character:<p>
604+ * <pre><code>
605+ * (char)(((a &amp; 0x0F) &lt;&lt; 12) | ((b &amp; 0x3F) &lt;&lt; 6) | (c &amp; 0x3F))
606+ * </code></pre>
607+ * If the first byte of a group matches the
608+ * pattern <code>1111xxxx</code> or the pattern
609+ * <code>10xxxxxx</code>, then a <code>UTFDataFormatException</code>
610+ * is thrown.
611+ * <p>
612+ * If end of file is encountered
613+ * at any time during this entire process,
614+ * then an <code>EOFException</code> is thrown.
615+ * <p>
616+ * After every group has been converted to
617+ * a character by this process, the characters
618+ * are gathered, in the same order in which
619+ * their corresponding groups were read from
620+ * the input stream, to form a <code>String</code>,
621+ * which is returned.
622+ * <p>
623+ * The <code>writeUTF</code>
624+ * method of interface <code>DataOutput</code>
625+ * may be used to write data that is suitable
626+ * for reading by this method.
627+ * @return a Unicode string.
628+ * @exception EOFException if this stream reaches the end
629+ * before reading all the bytes.
630+ * @exception IOException if an I/O error occurs.
631+ * @exception UTFDataFormatException if the bytes do not represent a
632+ * valid modified UTF-8 encoding of a string.
633+ */
634+ String readUTF() throws IOException;
635+}