Java MappedByteBuffer example, How to create a large size file in java.

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Java MappedByteBuffer example, How to create a large size file in java.
Posted on: August 13, 2010 at 12:00 AM

In this tutorial, you will see how to create a large size file in java.

Java MappedByteBuffer example, How to create a large file in java.

In this tutorial, you will see how to create a large file with the help of MappedByteBuffer class in java.

Code


import java.io.RandomAccessFile;

import java.nio.MappedByteBuffer;

import java.nio.channels.FileChannel;

            

public class CreateFile{

  public static void main(String[] args) throws Exception {

    RandomAccessFile out = new RandomAccessFile("test.txt", "rw");

    FileChannel fc = out.getChannel();

    int length = 0x8FFFAA;

	MappedByteBuffer MappByteBuff = fc.map(FileChannel.MapMode.READ_WRITE,

        0, length);

    for (int i = 0; i < length; i++)

    {

      MappByteBuff.put((byte) 'B');

    }

    System.out.println("File successFully written");

  }

}

Output

C:\>java CreateFile
File successFully written

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