1 byte that represents different values in java

Question

I have one byte that contains Upper 4 bits are a bitmap for system status like 0x40,0x80 and Lower 4 bits values like 0,1,2,3. I do not know to parse them.Can someone help me.can I have anything like this?how byte will look like???will it be byte b=(byte)0x80?

Answer 1

Bit masking. To get the upper 4 bits:

Upper=byte&0xF0

To get the first

First=byte&0x01

And so on.