11g Code to get the roles of the user and the roles assigned to users

public void getUsersByRole(String rolename){
RoleManager rolemanager=client.getService(RoleManager.class);
List s2;
try {
s2 = rolemanager.getRoleMembers(getRoleKey(rolename),false);
for (User user: s2)
{
System.out.println("User ID : "+user.getAttribute("User Login"));
}

} catch (RoleMemberException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (AccessDeniedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void getRolesForUser(String username){
try{
RoleManager rolemanager=client.getService(RoleManager.class);
List s3=rolemanager.getUserMemberships(getUserKey(username).toString),false);

for(Role role:s3){
System.out.println("Roles :" +role.getAttribute("Role Display Name"));
}
// System.out.println(s3);
}catch(Exception e){
e.printStackTrace();
}
}