How to check “hasRole” in Java Code with Spring Security?

Question

How to check user authority or permission in Java Code ? For example - I want to show or hide button for user depending on role. There are annotations like:

Answer 1

Instead of using a loop to find the authority from UserDetails you can do:

Collection authorities = authentication.getAuthorities();
boolean authorized = authorities.contains(new SimpleGrantedAuthority("ROLE_ADMIN"));