Can anyone help to explain this part of code?

Question

while((number & 1) == 0) {
   number >>>= 1;
}

I don't quite understand the condition in while loop, and what does it represent '>>>='.

Answer 1

The condition in the while loop tests whether the lowest bit of number is zero.

The >>>= operator is a compound assignment operator (see the tutorial here). The statement is the same as:

number = number >>> 1;

The >>> operator is a bit-wise right-shift with zero fill (see here). It differs from >> in that >> will fill with the sign bit, while >>> always fills with zero.

Note that the code fragment you posted will never terminate if number starts out as 0.