FilesExpand file tree

 master

/

LargeMappedFiles.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

21 lines (20 loc) · 658 Bytes

 master

/

LargeMappedFiles.java

Copy path

Top

File metadata and controls

• Code
• Blame

21 lines (20 loc) · 658 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

//: io/LargeMappedFiles.java

// Creating a very large file using mapping.

// {RunByHand}

import java.nio.*;

import java.nio.channels.*;

import java.io.*;

import static net.mindview.util.Print.*;

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');

print("Finished writing");

for(int i = length/2; i < length/2 + 6; i++)

printnb((char)out.get(i));

}

} ///:~