Understanding basic for-each loops java -

in java, know on site, topics such for-each or enhanced for loops have been covered before, don't still how work.

for example,

string[] = { "a", "b", "c", "d" };  string b = "";   (string q : a)      b = q + b;   system.out.println(b);

what b output?
tell me how so?
thank you.

the output "dcba"

a each loop standard loop convenience of assignment loop scope variable

what wrote equivalent to:

for (int = 0; < a.length; i++) {     string q = a[i];     b = q + b; }

Script