int x = 0x0011;依次判断x中是否有a,b,c,d的a: boolean has_a = (x|a==a);
b: boolean has_b = (x|a==b);
c: boolean has_c = (x|a==c);
d: boolean has_d = (x|a==d);http://www.javayou.com
b: boolean has_b = (x|a==b);
c: boolean has_c = (x|a==c);
d: boolean has_d = (x|a==d);http://www.javayou.com
has b:(x&~a)!=0
.........