How to check long buffer is direct or not in java.

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How to check long buffer is direct or not in java.
Posted on: August 5, 2010 at 12:00 AM

In this tutorial, you will see how to check long buffer is direct or not in java.

How to check long buffer is direct or not in java.

In this tutorial, we will discuss how to check long buffer is direct or not in java.

LongBuffer API.

The java.nio.LongBuffer class extends java.nio.Buffer class. It provides the following methods:

Return type	Method	Description
static LongBuffer	allocate( int capacity)	The allocate() method create a long buffer of specified capacity.
static LongBuffer	wrap(long[] array)	The wrap(...) method create a long buffer by wrapping the associated array.
abstract boolean	isDirect()	The isDirect() method tells whether this buffer is direct or not.

Code


import java.nio.*;

import java.nio.LongBuffer;


import java.nio.ByteBuffer;



public class BufferIsDirect {

  public static void main(String[] args) {

    LongBuffer longBuf = LongBuffer.allocate(256);

    if (longBuf.isDirect()) {

      System.out.println("long buffer is direct.");

    } else {

System.out.println("long buffer is not direct.");

    }

long[] arr = new long[] { 235456, 7766664, 787875 };

    LongBuffer longBuf1 = LongBuffer.wrap(arr);

    if (longBuf1.isDirect()) {

      System.out.println("long buffer is direct.");

    } else {

  System.out.println("long buffer is not direct.");

    }

ByteBuffer byteBuf = ByteBuffer.allocateDirect(1024);

    LongBuffer longBuf2 = byteBuf.asLongBuffer();

    if (longBuf2.isDirect()) {

      System.out.println("long buffer is direct.");

    } else {

  System.out.println("long buffer is not direct.");

    }

  }

}

Output

C:\>java BufferIsDirect
long buffer is not direct.
long buffer is not direct.
long buffer is direct.

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