Create memory mapped file java

From the JavaDocs: java. The new buffer will be backed by the the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will be array. Its backing array will be the given array, and its array offset will be zero.

Using the ByteBuffer. It allocates a simple object and initializes a few integers. Writing your algorithm against ByteBuffer is thus your best bet if you need to work with read only files. How are we doing? Please help us improve Stack Overflow.

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Collectives on Stack Overflow. Learn more. Memory-mapped files in Java Ask Question. Asked 12 years, 6 months ago. Active 10 years, 2 months ago. Viewed 25k times. Should I just wrap everything? Or should I double-write everything? Improve this question. Charles Add a comment. Active Oldest Votes. Improve this answer. Trevor Harrison Trevor Harrison 1, 1 1 gold badge 13 13 silver badges 20 20 bronze badges.

I agree. It sucks. I can't believe that ByteBuffer doesn't implement array. On the other hand, we did some performance tests, and we found that it's sometimes faster to use. Today's Question: How much time do you code every day? BufferedInputStream; import java. FileInputStream; import java. FileNotFoundException; import java. IOException; import java. RandomAccessFile; import java. Download Microsoft Edge More info.

Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Submit and view feedback for This product This page. View all page feedback. In this article. To obtain a MemoryMappedFile object that represents a persisted memory-mapped file from a file on disk. CreateFromFile method. To obtain a MemoryMappedFile object that represents a non-persisted memory-mapped file not associated with a file on disk.

CreateNew method. CreateOrOpen method. To obtain a MemoryMappedFile object of an existing memory-mapped file either persisted or non-persisted. OpenExisting method. To obtain a UnmanagedMemoryStream object for a sequentially accessed view to the memory-mapped file. CreateViewStream method. To obtain a UnmanagedMemoryAccessor object for a random access view to a memory-mapped file.

CreateViewAccessor method. SafeMemoryMappedFileHandle property. SafeMemoryMappedViewHandle property.