How can i find where a method or a variable is used in Android Studio (shortcut)

I know how to find the source by maintaining ctrl + left click on a method for example , but if i want to search where did this method is used ?

Lets support i have the following method :

class A{
public int sum(int a, int b){
return a+b;
}
}

and i'am using this method in

class B{
...
sum(c+d);
...
}

and i want to find where i used sum while i was in class A.

PS : i'am new to Android studio (started using it like a month ago)

edit : i'm using Windows 7

Thanks !