ByteBuf buffer = Unpooled.buffer(10); // create a new buffer with a capacity of 10 buffer.writeZero(5); // write 5 zero bytes to the buffer System.out.println(buffer); // prints: "0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00"
int paddingSize = 16 - (dataLength % 16); // calculate the number of bytes needed to pad the data to a multiple of 16 buffer.writeZero(paddingSize); // write the necessary number of zero bytes to the buffer to pad the data to a multiple of 16In this example, we calculate the number of bytes needed to pad some data to a multiple of 16. We then use the `writeZero` method to write the necessary number of zero bytes to the buffer to pad the data. The `writeZero` method is part of the `io.netty.buffer` package library.