关于Java中位运算，请高手解释一上这个有关问题_J2SE

关于Java中位运算，请高手解释一下这个问题

Java code

    private int sequenceNum;    private byte[] audioData;    public static final int MIN_HEAD = 12;    public RtpPacket(byte[] srcData) throws IOException    {        int iPlayDataIndx = MIN_HEAD;        int cc = srcData[0] & 0x0F;        iPlayDataIndx += cc * 4;        sequenceNum = srcData[2] * 0x100 | (srcData[3] & 0xFF);        int x = srcData[0] & 0x10;        if (1 == x)        //有拓展头        {            int headerExtensionLength = srcData[iPlayDataIndx + 2] * 0x100                    | (srcData[iPlayDataIndx + 3] & 0xFF);            iPlayDataIndx += 4;            iPlayDataIndx += headerExtensionLength;        }        audioData = new byte[srcData.length - iPlayDataIndx];        System                .arraycopy(srcData, iPlayDataIndx, audioData, 0,                        audioData.length);    }

这个是对RTP包数据解析的一个过程，
请教一下其中

Java code

        int cc = srcData[0] & 0x0F;

Java code

sequenceNum = srcData[2] * 0x100 | (srcData[3] & 0xFF);        int x = srcData[0] & 0x10;

Java code

            int headerExtensionLength = srcData[iPlayDataIndx + 2] * 0x100                    | (srcData[iPlayDataIndx + 3] & 0xFF);

这些位运算是什么意思？小弟对位运算不是很通，请高手指点一下

------解决方案--------------------------------------------------------
这个你去看书比我们说的肯定清楚...
这几个是位与,一般用来做位匹配的