Advanced use of the optional class

Optional Is a tool class without subclasses ,Optional Is a can for null The container object of , Its main purpose is to avoid Null Check , prevent NullpointExcepion

Optional Basic use of

Optional<String> opt1 = Optional.of("yqq");
        Optional<Object> opt2 = Optional.empty();
        // If there is value , Just do what 
        opt1.ifPresent(s -> System.out.println(" Valuable :"+s));
        opt2.ifPresent(s -> System.out.println(" No value "));