Program

  package   com . example ; //import java.nio.ByteBuffer; //導入依賴的package包/類 import   java . io . IOException ; import   java . nio . ByteBuffer ; import   java . nio . CharBuffer ; import   java . nio . channels . SeekableByteChannel ; import   java . nio . charset . Charset ; import   java . nio . charset . StandardCharsets ; import   java . nio . file . Files ; import   java . nio . file . Path ; import   java . nio . file . Paths ; import   java . util . Arrays ; import   java . io . RandomAccessFile ; /**  * Hello world!  *  */ public   class   byteRead   {      public   static   void   main (  String []  args  )  throws   IOException     {          System . out . println (  "Hello World!"  );          String   fileName = "C: \\ Work \\ Java \\ data \\ 19027835361399637" ;                   RandomAccessFile   f  =  new   RandomAccessFile ( fileName ,  "r" );          byte []  b  =  new   byte [( int ) f . length ()];          f . readFully ( b );