ByteBuf buffer = Unpooled.buffer(8); buffer.writeDouble(3.14159); double value = buffer.readDouble(); System.out.println(value); // prints 3.14159
byte[] bytes = new byte[] { 0x40, 0x09, (byte) 0x21, (byte) 0xfb, 0x54, (byte) 0x44, 0x2d, (byte) 0x18 }; ByteBuf buffer = Unpooled.wrappedBuffer(bytes); double value = buffer.readDouble(); System.out.println(value); // prints 3.14159In this example, we create a byte array containing the eight bytes that represent the double value of 3.14159. We then wrap the array in a ByteBuf using the Unpooled.wrappedBuffer method and read the value from the buffer using the readDouble method. Finally, we print the value to the console. The java io.netty.buffer package library provides efficient and flexible I/O operations that can be used to read from and write to buffers, including ByteBuf. The readDouble method of ByteBuf can be used to read double values from the buffer.