Java8-Lambda-No.02

public class Lambda2 {    @FunctionalInterface    public static interface Converter<F, T> {        T convert(F from);    }    static class Something {        String startsWith(String s) {            return String.valueOf(s.charAt(0));        }    }    interface PersonFactory<P extends Person> {        P create(String firstName, String lastName);    }    public static void main(String[] args) {        Converter<String, Integer> integerConverter1 = (from) -> Integer.valueOf(from);        Integer converted1 = integerConverter1.convert("123");        System.out.println(converted1);   // result: 123        // method reference        Converter<String, Integer> integerConverter2 = Integer::valueOf;        Integer converted2 = integerConverter2.convert("123");        System.out.println(converted2);   // result: 123        Something something = new Something();        Converter<String, String> stringConverter = something::startsWith;        String converted3 = stringConverter.convert("Java");        System.out.println(converted3);    // result J        // constructor reference        PersonFactory<Person> personFactory = Person::new;        Person person = personFactory.create("Peter", "Parker");    }}