public class contact
{
    public string lastname;

}
contact cc =new contact();
cc.lastname='damu';
insert cc;

 

I mentioned my return type as Contact in my method
until you specify that Contact record with DML statement it won't save to database
and if you won't specify systm.debug , we can't see the output in debug log
But if you are not using the DML statment and system.debug
How &&Where can you use the returned values from any method in apex class???????