createbuf.html

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<TITLE>Creating a ByteBuffer
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  <h3>
    e158.  
    Creating a ByteBuffer</h3>

A <code>ByteBuffer</code> is a fixed-capacity buffer that holds byte values.
This example demonstrates a number of ways to create a <code>ByteBuffer</code>.

<P> See also <a href="../java.nio/GetBytes.html" class="eglink"><font size="-1"><b>e159</b> Getting Bytes from a ByteBuffer</font></a> and
<a href="../java.nio/PutBytes.html" class="eglink"><font size="-1"><b>e160</b> Putting Bytes into a ByteBuffer</font></a>.


<pre>
    // Create a ByteBuffer using a byte array
    byte[] bytes = new byte[<font color="#0066ff"><i>10</i></font>];
    ByteBuffer buf = ByteBuffer.wrap(bytes);
    
    // Create a non-direct ByteBuffer with a 10 byte capacity
    // The underlying storage is a byte array.
    buf = ByteBuffer.allocate(<font color="#0066ff"><i>10</i></font>);
    
    // Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.
    buf = ByteBuffer.allocateDirect(<font color="#0066ff"><i>10</i></font>);
    
    // To create a ByteBuffer for a memory-mapped file,
    // see <a href="../java.nio/CreateMemMap.html" class="eglink"><font size="-1"><b>e166</b> Creating a Memory-Mapped File</font></a>

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            &nbsp;Related Examples
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e159. <a class="eglink" href="GetBytes.html?l=rel">
    Getting Bytes from a ByteBuffer
</a>
<br>

e160. <a class="eglink" href="PutBytes.html?l=rel">
    Putting Bytes into a ByteBuffer
</a>
<br>

e161. <a class="eglink" href="Buf2Array.html?l=rel">
    Converting Between a ByteBuffer an a Byte Array
</a>
<br>

e162. <a class="eglink" href="GetSetTypes.html?l=rel">
    Getting and Setting Non-Byte Java Types in a ByteBuffer
</a>
<br>

e163. <a class="eglink" href="TypeBuf.html?l=rel">
    Creating a Non-Byte Java Type Buffer on a ByteBuffer
</a>
<br>

e164. <a class="eglink" href="PutString.html?l=rel">
    Using a ByteBuffer to Store Strings
</a>
<br>

e165. <a class="eglink" href="SetOrder.html?l=rel">
    Setting the Byte Ordering for a ByteBuffer
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#File%20Locking">
    File Locking
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Files">
    Files
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Sockets">
    Sockets
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Streams">
    Streams
</a>&nbsp;&nbsp;

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