java8新特性（2）— 方法引用

新增语法双冒号（::）

package com.common.jdk8;import java.util.Arrays;
import java.util.List;//方法引用
public class Jdk8Test2 {public static void main(String[] args) {//构造器引用：它的语法是Class::new，或者更一般的Class< T >::new实例如下：Car car = Car.create(Car::new);Car car2 = Car.create(Car::new);List<Car> cars = Arrays.asList(car,car2);//静态方法引用：它的语法是Class::static_method，实例如下：cars.forEach(Car::collide);//特定类的任意对象的方法引用：它的语法是Class::method实例如下：cars.forEach(Car::repair);//特定对象的方法引用：它的语法是instance::method实例如下：Car police = Car.create(Car::new);cars.forEach(police::follow);//println 特殊的方法引用cars.forEach(System.out::println);}}@FunctionalInterface
interface Supplier<T> {T get();
}class Car {//Supplier是jdk1.8的接口，这里和lamda一起使用了public static Car create(final Supplier<Car> supplier) {return supplier.get();}public static void collide(final Car car) {System.out.println("Collided " + car.toString());}public void follow(final Car another) {System.out.println("Following the " + another.toString());}public void repair() {System.out.println("Repaired " + this.toString());}
}

运行结果

Collided com.common.jdk8.Car@7eda2dbb
Collided com.common.jdk8.Car@6576fe71
Repaired com.common.jdk8.Car@7eda2dbb
Repaired com.common.jdk8.Car@6576fe71
Following the com.common.jdk8.Car@7eda2dbb
Following the com.common.jdk8.Car@6576fe71
com.common.jdk8.Car@7eda2dbb
com.common.jdk8.Car@6576fe71