What is memory-mapped files in Java?

Memory-mapped files in Java allow applications to read and write files as if they were part of memory. This technique can be useful for handling large files because it provides a way to perform file I/O without the overhead of traditional file reading and writing methods. By mapping a file into memory, Java applications can access file data directly in the same way they access data in memory, resulting in improved performance and simplified code.

Example of Memory-Mapped Files in Java


        import java.io.RandomAccessFile;
        import java.nio.MappedByteBuffer;
        import java.nio.channels.FileChannel;
        import java.nio.file.StandardOpenOption;

        public class MemoryMappedFileExample {
            public static void main(String[] args) {
                try {
                    // Open a file channel
                    RandomAccessFile memoryMappedFile = new RandomAccessFile("example.txt", "rw");
                    FileChannel fileChannel = memoryMappedFile.getChannel();

                    // Map the file into memory
                    MappedByteBuffer buffer = fileChannel.map(FileChannel.MapMode.READ_WRITE, 0, memoryMappedFile.length());

                    // Read and write data in the mapped file
                    while (buffer.hasRemaining()) {
                        byte b = buffer.get();
                        System.out.print((char) b);
                    }

                    // Write something to the file
                    buffer.put("Hello, Memory-Mapped File!".getBytes());

                    // Clean up
                    memoryMappedFile.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

What is memory-mapped files in Java?

Example of Memory-Mapped Files in Java

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What is memory-mapped files in Java?

Example of Memory-Mapped Files in Java

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