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  • Java8-Lambda-No.03

    import java.util.Comparator;
    import java.util.Objects;
    import java.util.UUID;
    import java.util.concurrent.Callable;
    import java.util.function.Consumer;
    import java.util.function.Function;
    import java.util.function.Predicate;
    import java.util.function.Supplier;
    
    public class Lambda3 {
    
        @FunctionalInterface
        interface Fun {
            void foo();
        }
    
        public static void main(String[] args) throws Exception {
    
            // Predicates
    
            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();
    
    
            // Functions
    
            Function<String, Integer> toInteger = Integer::valueOf;
            Function<String, String> backToString = toInteger.andThen(String::valueOf);
    
            backToString.apply("123");     // "123"
    
    
            // Suppliers
    
            Supplier<Person> personSupplier = Person::new;
            personSupplier.get();   // new Person
    
    
            // Consumers
    
            Consumer<Person> greeter = (p) -> System.out.println("Hello, " + p.firstName);
            greeter.accept(new Person("Luke", "Skywalker"));
    
    
    
            // Comparators
    
            Comparator<Person> comparator = (p1, p2) -> p1.firstName.compareTo(p2.firstName);
    
            Person p1 = new Person("John", "Doe");
            Person p2 = new Person("Alice", "Wonderland");
    
            comparator.compare(p1, p2);             // > 0
            comparator.reversed().compare(p1, p2);  // < 0
    
    
            // Runnables
    
            Runnable runnable = () -> System.out.println(UUID.randomUUID());
            runnable.run();
    
    
            // Callables
    
            Callable<UUID> callable = UUID::randomUUID;
            callable.call();
        }
    
    }
    
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  • 原文地址:https://www.cnblogs.com/bilaisheng/p/10210915.html
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