bitmask question?

Question

I have the follow:

public static final int LIMIT_ONE = 1;
public static final int TRADEABLE = (1 << 1);
public static final int SELLABLE = (1 << 2);
         


        

Answer 1

I don't understand the question "how it is calculated to give the follow result". (What is calculated?)

The main thing to understand is that all computer values are stored in binary. Any number will be a combination of 0 and 1 bit. Some numbers only have one 1 bit.

http://en.wikipedia.org/wiki/Mask_(computing)