List<String> list = new ArrayList<>();

        //list.stream().filter((String s)->System.out.print(s);return s);

        String str="sadfasdf";

        //str.length()

        Function<String,Integer> func1= (s1)->s1.length();

        Function<String,Integer> func2= String::length;

        Function<String,Integer> func3= (s1)->str.length();

        Supplier<Integer> func4= str::length;