What does 'int kk = 2 | 3;' mean?

Question

I have been programming in java for a while but I have not met a strange expression

int kk = 2 | 3;

What does '|' mean in this expression? It seems hard to Google it.

I met it in source

i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);

Why we need to use this?

Answer 1

It's a bitwise or - each result bit will be set if either or both inputs have a bit set in that position. 2 is 10 in binary, 3 is 11, so the result will also be 3.

Answer 2

它是“ bitwise inclusive or operator ” 。

Answer 3

| is a bitwise Operator . In your case, 2|3 will produce 3 as 2 is 10 and 3 is 11. 10 | 11 = 11 10 | 11 = 11 .

Answer 4

您可以查看http://vipan.com/htdocs/bitwisehelp.html我认为它们是关于位移运算符的非常好的教程