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  Interface java.io.DataInput
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<a href="packages.html">All Packages</a>  <a href="tree.html">Class Hierarchy</a>  <a href="Package-java.io.html">This Package</a>  <a href="Package-java.io.html">Previous</a>  <a href="java.io.DataOutput.html#_top_">Next</a>  <a href="AllNames.html">Index</a></pre>
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<h1>
  Interface java.io.DataInput
</h1>
<dl>
  <dt> public interface <b>DataInput</b>
</dl>
The data input interface is implemented by streams that can read 
 primitive Java data types from a stream in a machine-independent 
 manner.
<p>
<dl>
    <dt> <b>See Also:</b>
    <dd> <a href="java.io.DataInputStream.html#_top_">DataInputStream</a>, <a href="java.io.DataOutput.html#_top_">DataOutput</a>
</dl>
<hr>
<a name="index"></a>
<h2>
  <img src="images/method-index.gif" width=207 height=38 alt="Method Index">
</h2>
<dl>
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readBoolean()"><b>readBoolean</b></a>()
  <dd>  Reads a <code>boolean</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readByte()"><b>readByte</b></a>()
  <dd>  Reads a signed 8-bit value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readChar()"><b>readChar</b></a>()
  <dd>  Reads a Unicode <code>char</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readDouble()"><b>readDouble</b></a>()
  <dd>  Reads a <code>double</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readFloat()"><b>readFloat</b></a>()
  <dd>  Reads a <code>float</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readFully(byte[])"><b>readFully</b></a>(byte[])
  <dd>  Reads <code>b.length</code> bytes into the byte array.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readFully(byte[], int, int)"><b>readFully</b></a>(byte[], int, int)
  <dd>  Reads <code>b.length</code> bytes into the byte array.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readInt()"><b>readInt</b></a>()
  <dd>  Reads an <code>int</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readLine()"><b>readLine</b></a>()
  <dd>  Reads the next line of text from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readLong()"><b>readLong</b></a>()
  <dd>  Reads a <code>long</code> value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readShort()"><b>readShort</b></a>()
  <dd>  Reads a 16-bit value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readUnsignedByte()"><b>readUnsignedByte</b></a>()
  <dd>  Reads an unsigned 8-bit value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readUnsignedShort()"><b>readUnsignedShort</b></a>()
  <dd>  Reads an unsigned 16-bit value from the input stream.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#readUTF()"><b>readUTF</b></a>()
  <dd>  Reads in a string that has been encoded using a modified UTF-8 format.
  <dt> <img src="images/red-ball-small.gif" width=6 height=6 alt=" o ">
	<a href="#skipBytes(int)"><b>skipBytes</b></a>(int)
  <dd>  Skips exactly <code>n</code> bytes of input.
</dl>
<a name="methods"></a>
<h2>
  <img src="images/methods.gif" width=151 height=38 alt="Methods">
</h2>
<a name="readFully(byte[])"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readFully"><b>readFully</b></a>
<pre>
 public abstract void readFully(byte b[]) throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads <code>b.length</code> bytes into the byte array. This 
 method blocks until all the bytes are read.
<p>
  <dd><dl>
    <dt> <b>Parameters:</b>
    <dd> b - the buffer into which the data is read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readFully(byte[], int, int)"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readFully"><b>readFully</b></a>
<pre>
 public abstract void readFully(byte b[],
                                int off,
                                int len) throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads <code>b.length</code> bytes into the byte array. This 
 method blocks until all the bytes are read.
<p>
  <dd><dl>
    <dt> <b>Parameters:</b>
    <dd> b - the buffer into which the data is read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="skipBytes(int)"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="skipBytes"><b>skipBytes</b></a>
<pre>
 public abstract int skipBytes(int n) throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Skips exactly <code>n</code> bytes of input.
<p>
  <dd><dl>
    <dt> <b>Parameters:</b>
    <dd> n - the number of bytes to be skipped.
    <dt> <b>Returns:</b>
    <dd> the number of bytes skipped, which is always <code>n</code>.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before skipping
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readBoolean()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readBoolean"><b>readBoolean</b></a>
<pre>
 public abstract boolean readBoolean() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a <code>boolean</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the <code>boolean</code> value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readByte()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readByte"><b>readByte</b></a>
<pre>
 public abstract byte readByte() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a signed 8-bit value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the 8-bit value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readUnsignedByte()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readUnsignedByte"><b>readUnsignedByte</b></a>
<pre>
 public abstract int readUnsignedByte() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads an unsigned 8-bit value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the unsigned 8-bit value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readShort()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readShort"><b>readShort</b></a>
<pre>
 public abstract short readShort() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a 16-bit value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the 16-bit value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readUnsignedShort()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readUnsignedShort"><b>readUnsignedShort</b></a>
<pre>
 public abstract int readUnsignedShort() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads an unsigned 16-bit value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the unsigned 16-bit value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readChar()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readChar"><b>readChar</b></a>
<pre>
 public abstract char readChar() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a Unicode <code>char</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the Unicode <code>char</code> read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readInt()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readInt"><b>readInt</b></a>
<pre>
 public abstract int readInt() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads an <code>int</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the <code>int</code> value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readLong()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readLong"><b>readLong</b></a>
<pre>
 public abstract long readLong() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a <code>long</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the <code>long</code> value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readFloat()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readFloat"><b>readFloat</b></a>
<pre>
 public abstract float readFloat() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a <code>float</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the <code>float</code> value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readDouble()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readDouble"><b>readDouble</b></a>
<pre>
 public abstract double readDouble() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads a <code>double</code> value from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> the <code>double</code> value read.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end before reading
               all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readLine()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readLine"><b>readLine</b></a>
<pre>
 public abstract <a href="java.lang.String.html#_top_">String</a> readLine() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads the next line of text from the input stream.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> if this stream reaches the end before reading all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
  </dl></dd>
</dl>
<a name="readUTF()"><img src="images/red-ball.gif" width=12 height=12 alt=" o "></a>
<a name="readUTF"><b>readUTF</b></a>
<pre>
 public abstract <a href="java.lang.String.html#_top_">String</a> readUTF() throws <a href="java.io.IOException.html#_top_">IOException</a>
</pre>
<dl>
  <dd> Reads in a string that has been encoded using a modified UTF-8 format.
 <p>
 For an exact description of this method, see the discussion in 
 Gosling, Joy, and Steele, <i>The Java Language Specification</i>.
<p>
  <dd><dl>
    <dt> <b>Returns:</b>
    <dd> a Unicode string.
    <dt> <b>Throws:</b> <a href="java.io.EOFException.html#_top_">EOFException</a>
    <dd> if this stream reaches the end
               before reading all the bytes.
    <dt> <b>Throws:</b> <a href="java.io.IOException.html#_top_">IOException</a>
    <dd> if an I/O error occurs.
    <dt> <b>Throws:</b> <a href="java.io.UTFDataFormatException.html#_top_">UTFDataFormatException</a>
    <dd> if the bytes do not represent a
               valid UTF-8 encoding of a string.
  </dl></dd>
</dl>
<hr>
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