java ByteBuffer

import java.nio.ByteBuffer;  import java.nio.ByteOrder;  public class bytebuffertest {        public static void main(String[] args)      {          // Create a ByteBuffer using a byte array           byte[] bytes = new byte[10];          ByteBuffer buf = ByteBuffer.wrap(bytes);            // Create a non-direct ByteBuffer with a 10 byte capacity           // The underlying storage is a byte array.           buf = ByteBuffer.allocate(10);            // Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.           buf = ByteBuffer.allocateDirect(10);                      // Create an empty ByteBuffer with a 10 byte capacity           ByteBuffer bbuf = ByteBuffer.allocate(10);            // Get the ByteBuffer's capacity           int capacity = bbuf.capacity(); // 10           System.out.println(capacity);            // Use the absolute get().           // This method does not affect the position.           byte b = bbuf.get(5); // position=0             // Set the position           bbuf.position(5);            // Use the relative get()           b = bbuf.get();            // Get the new position           int pos = bbuf.position(); // 6             // Get remaining byte count           int rem = bbuf.remaining(); // 4             // Set the limit           bbuf.limit(7); // remaining=1             // This convenience method sets the position to 0           bbuf.rewind(); // remaining=7                     //Converting Between a ByteBuffer an a Byte Array              // Create a ByteBuffer from a byte array           byte[] bytes1 = new byte[10];          ByteBuffer buf1 = ByteBuffer.wrap(bytes);            // Retrieve bytes between the position and limit           // (see Putting Bytes into a ByteBuffer)           bytes1 = new byte[buf.remaining()];          buf1.get(bytes1, 0, bytes1.length);            // Retrieve all bytes in the buffer           buf1.clear();          bytes1 = new byte[buf1.capacity()];          buf1.get(bytes1, 0, bytes1.length);                    // Use the absolute put().           // This method does not affect the position.           bbuf.put((byte)0xFF); // position=0             // Set the position           bbuf.position(5);            // Use the relative put()           bbuf.put((byte)0xFF);            // Get the new position           int pos1 = bbuf.position(); // 6                               //Setting the Byte Ordering for a ByteBuffer            // Get default byte ordering           ByteOrder order = buf.order(); // ByteOrder.BIG_ENDIAN             // Put a multibyte value           buf.putShort(0, (short)123);          buf.get(0); // 0           buf.get(1); // 123             // Set to little endian           buf.order(ByteOrder.LITTLE_ENDIAN);            // Put a multibyte value           buf.putShort(0, (short)123);          buf.get(0); // 123           buf.get(1); // 0             }  } 

这是一篇转载的博客我还没有来得及进行验证，放在这里只是为了以后自己方便查看，如有错误的地方还请以评论的方式告知，我会进行改正。