byte array from / to double [ c++ vs java ]

byte array from or to double

c++
    long result = getByte() & 0xFF;
    result |= (getByte() & 0xFF) << 8;
    result |= (getByte() & 0xFF) << 16;
    result |= (getByte() & 0xFF) << 24;
    result |= (getByte() & 0xFF) << 32;
    result |= (getByte() & 0xFF) << 40;
    result |= (getByte() & 0xFF) << 48;
    result |= (getByte() & 0xFF) << 56;
    
    ----
    long i64 = result;
    double m_value;
    memcpy(&m_value, &i64, sizeof(long));
    
    
java:
    
    byte[] ba = new byte[8];
    for (int i = 0; i < ba.length; i++)
      ba[i] = (byte) getByte();

    
    byte[] i64 = ba;
    ByteBuffer buf = ByteBuffer.allocate(8).put(i64);
    buf.flip();
    buf.order(buf.order() == ByteOrder.BIG_ENDIAN ? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
    double m_value = buf.getDouble();