说明
io.netty.buffer.ByteBuf经常需要跟其它类型互相转化，例如ByteBuf类型作为Object类型函数参数传递，函数内部处理时将Object转换为ByteBuf。
代码示例
ByteBuf和Object类型互转
package com.thb;import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;public class Demo {public static void main(String[] args) {// 创建一个ByteBufByteBuf buf = Unpooled.buffer();// 将ByteBuf变量赋值给对象变量Object msg = buf;System.out.println("msg == buf: " + (msg == buf));if (msg instanceof ByteBuf) { // 如果msg是ByteBuf类型// 将对象变量转化为ByteBuf变量ByteBuf buf2 = (ByteBuf)msg;System.out.println("buf2 == buf: " + (buf2 == buf));System.out.println("buf2 == msg: " + (buf2 == msg));System.out.println("buf.refCnt(): " + buf.refCnt());buf2.release();System.out.println("after call buf2 relase, buf.refCnt(): " + buf.refCnt());}}}
运行输出：
msg == buf: true
buf2 == buf: true
buf2 == msg: true
buf.refCnt(): 1
after call buf2 relase, buf.refCnt(): 0
