Here is an example of using the ChunkedWriter class from the org.apache.commons.io package in Java to write a large file in chunks:

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.io.ChunkedWriter;

public class ChunkedFileWriterExample {
    public static void main(String[] args) throws IOException {
        // File to write to
        File outputFile = new File("large_file.txt");
        // Chunk size
        int chunkSize = 1024 * 1024; // 1MB

        // Create a ChunkedWriter with the specified chunk size
        try (ChunkedWriter chunkedWriter = new ChunkedWriter(new FileOutputStream(outputFile), chunkSize)) {
            // Write to the file in chunks
            for (int i = 0; i < 100; i++) {
                String chunk = "This is chunk " + i + "\n";
                chunkedWriter.write(chunk);
            }
        }
    }
}

In this example, a new ChunkedWriter is created with a specified chunk size of 1MB and a FileOutputStream that writes to the specified file. The loop writes "This is chunk X" 100 times to the file in chunks of 1MB.