import java.io.*;
public class FileReadWriteExample {
public static void main(String[] args) {
try {
FileInputStream fileInputStream = new FileInputStream("input.txt");
FileOutputStream fileOutputStream = new FileOutputStream("output.txt");
int data;
while ((data = fileInputStream.read()) != -1) {
fileOutputStream.write(data);
}
fileInputStream.close();
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
import java.nio.*;
import java.nio.channels.*;
public class AsyncFileReadWriteExample {
public static void main(String[] args) {
try {
AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("input.txt"), StandardOpenOption.READ);
ByteBuffer buffer = ByteBuffer.allocate(1024);
fileChannel.read(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
public void completed(Integer result, ByteBuffer attachment) {
attachment.flip();
AsynchronousFileChannel outFileChannel = AsynchronousFileChannel.open(Paths.get("output.txt"), StandardOpenOption.CREATE, StandardOpenOption.WRITE);
outFileChannel.write(attachment, 0, attachment, new CompletionHandler<Integer, ByteBuffer>() {
public void completed(Integer result, ByteBuffer attachment) {
outFileChannel.close();
}
public void failed(Throwable exc, ByteBuffer attachment) {
exc.printStackTrace();
}
});
}
public void failed(Throwable exc, ByteBuffer attachment) {
exc.printStackTrace();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}
