Data update

Task/Fixed-length-records/Java/fixed-length-records-1.java

@@ -0,0 +1,29 @@
+import module java.base;
+
+public final class FixedLengthRecords {
+
+	public static void main() throws IOException {
+		try ( FileChannel reader = FileChannel.open(Path.of("./infile.dat"), StandardOpenOption.READ);
+			FileChannel writer = FileChannel.open(Path.of("./outfile.dat"), StandardOpenOption.CREATE,
+																			StandardOpenOption.WRITE) ) {
+		
+			ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
+			
+			while ( reader.read(buffer) != END_OF_FILE ) {
+				for ( int i = 0, j = BUFFER_SIZE - 1; i < j; j--, i++ ) {
+				    final byte temp = buffer.get(i);
+				    buffer.put(i, buffer.get(j));
+				    buffer.put(j, temp);
+				}
+				
+				buffer.flip();
+				writer.write(buffer);
+				buffer.flip();
+			}
+		}
+	}
+	
+	private static final int BUFFER_SIZE = 80;
+	private static final int END_OF_FILE = -1;
+
+}