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rbiblerbible
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change class name
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src/main/java/com/winterbe/java8/samples/lambda/Lambda3.java renamed to src/main/java/com/winterbe/java8/samples/lambda/CommonFunctions.java

Lines changed: 80 additions & 81 deletions
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package com.winterbe.java8.samples.lambda;
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import java.util.Comparator;
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import java.util.Objects;
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import java.util.UUID;
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import java.util.concurrent.Callable;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.function.Supplier;
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/**
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* Common standard functions from the Java API.
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*
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* @author Benjamin Winterberg
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*/
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public class Lambda3 {
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@FunctionalInterface
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interface Fun {
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void foo();
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}
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public static void main(String[] args) throws Exception {
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// Predicates
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Predicate<String> predicate = (s) -> s.length() > 0;
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predicate.test("foo"); // true
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predicate.negate().test("foo"); // false
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Predicate<Boolean> nonNull = Objects::nonNull;
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nonNull.test(null);
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Predicate<Boolean> isNull = Objects::isNull;
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isNull.test(null);
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Predicate<String> isEmpty = String::isEmpty;
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isEmpty.test("");
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Predicate<String> isNotEmpty = isEmpty.negate();
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isNotEmpty.test("");
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// Functions
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Function<String, Integer> toInteger = Integer::valueOf;
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Function<String, String> backToString = toInteger.andThen(String::valueOf);
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backToString.apply("123"); // "123"
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// Suppliers
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Supplier<Person> personSupplier = Person::new;
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personSupplier.get(); // new Person
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// Consumers
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Consumer<Person> greeter = (p) -> System.out.println("Hello, " + p.firstName);
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greeter.accept(new Person("Luke", "Skywalker"));
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// Comparators
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Comparator<Person> comparator = (p1, p2) -> p1.firstName.compareTo(p2.firstName);
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Person p1 = new Person("John", "Doe");
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Person p2 = new Person("Alice", "Wonderland");
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comparator.compare(p1, p2); // > 0
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comparator.reversed().compare(p1, p2); // < 0
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// Runnables
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Runnable runnable = () -> System.out.println(UUID.randomUUID());
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runnable.run();
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// Callables
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Callable<UUID> callable = UUID::randomUUID;
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callable.call();
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}
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}
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package com.winterbe.java8.samples.lambda;
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import java.util.Comparator;
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import java.util.Objects;
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import java.util.UUID;
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import java.util.concurrent.Callable;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.function.Supplier;
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/**
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* Common standard functions from the Java API.
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*
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* @author Benjamin Winterberg
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*/
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public class CommonFunctions {
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@FunctionalInterface
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interface Fun {
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void foo();
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}
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public static void main(String[] args) throws Exception {
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// Predicates
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Predicate<String> predicate = (s) -> s.length() > 0;
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predicate.test("foo"); // true
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predicate.negate().test("foo"); // false
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Predicate<Boolean> nonNull = Objects::nonNull;
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nonNull.test(null);
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Predicate<Boolean> isNull = Objects::isNull;
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isNull.test(null);
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Predicate<String> isEmpty = String::isEmpty;
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isEmpty.test("");
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Predicate<String> isNotEmpty = isEmpty.negate();
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isNotEmpty.test("");
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// Functions
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Function<String, Integer> toInteger = Integer::valueOf;
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Function<String, String> backToString = toInteger.andThen(String::valueOf);
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backToString.apply("123"); // "123"
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// Suppliers
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Supplier<Person> personSupplier = Person::new;
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personSupplier.get(); // new Person
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// Consumers
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Consumer<Person> greeter = (p) -> System.out.println("Hello, " + p.firstName);
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greeter.accept(new Person("Luke", "Skywalker"));
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// Comparators
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Comparator<Person> comparator = (p1, p2) -> p1.firstName.compareTo(p2.firstName);
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Person p1 = new Person("John", "Doe");
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Person p2 = new Person("Alice", "Wonderland");
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comparator.compare(p1, p2); // > 0
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comparator.reversed().compare(p1, p2); // < 0
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// Runnables
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Runnable runnable = () -> System.out.println(UUID.randomUUID());
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runnable.run();
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// Callables
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Callable<UUID> callable = UUID::randomUUID;
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callable.call();
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}
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}

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