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My season ticket will expire this week
expire: [ iks'paiə, eks- ] v. 到期 期满 届满 过期 满期满 死 消灭 tutorial
0xFF
is hexidecimal, you can Wikipedia that part.
FF is a representation of
00000000
00000000
00000000
11111111
(a
32
-bit integer)
bit-wise 逐位
& means bit-wise
"and"
, and so when you use it on two ints, each pair of bits from those two ints is
and-ed and the result is placed in the resultant
int
:
Example (showing
16
bits only)
0101
1100
1010
1100
&
0000
0000
1111
1111
-----------------
=
0000
0000
1010
1100
So as you can see,
0xFF
is often used to to isolate a
byte
in an integer, by truncating the integer to one
byte
's worth of 1'
s.
For more information, see
this
WP article:
Starting with this instance of %, process all consecutive substrings of the form %xy. Each substring %xy will yield a byte. Convert all consecutive bytes obtained this way to whatever
character(s) they represent in the provided
*encoding
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