largemappedfiles.java

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import java.io.*;
import java.nio.*;
import java.nio.channels.*;
public class LargeMappedFiles {
  static int length = 0x8FFFFFF; // 128 Mb
  public static void main(String[] args) throws Exception {
    MappedByteBuffer out = 
      new RandomAccessFile("test.dat", "rw").getChannel()
      .map(FileChannel.MapMode.READ_WRITE, 0, length);
    for(int i = 0; i < length; i++)
      out.put((byte)'x');
    System.out.println("Finished writing");
    for(int i = length/2; i < length/2 + 6; i++)
      System.out.print((char)out.get(i));
  }
}