java有哪些内置的函数式接口

Predicate<String> predicate = (s) -> s.length() > 0;

predicate.test("foo");              // true

predicate.negate().test("foo");     // false

Predicate<Boolean> nonNull = Objects::nonNull;

Predicate<Boolean> isNull = Objects::isNull;

Predicate<String> isEmpty = String::isEmpty;

Predicate<String> isNotEmpty = isEmpty.negate();

Function<String, Integer> toInteger = Integer::valueOf;

Function<String, String> backToString = toInteger.andThen(String::valueOf);

backToString.apply("123");     // "123"

Supplier<Person> personSupplier = Person::new;

personSupplier.get();   // new Person