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构造器引用 数组引用

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package com.atguigu.java2;import org.junit.Test;import java.util.Arrays;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;/*** 一、构造器引用*      和方法引用类似，函数式接口的抽象方法的形参列表和构造器的形参列表一致*      抽象方法的返回值类型即为构造器所属的类的类型** 二、数组引用*      可以吧数组看做是一个特殊的类，则写法就与构造器引用一致** Created by shkstart*/
public class ConstructorRefTest {//构造器引用//Supplier中的T get()// Employee的空参构造器：employee（）@Testpublic void test1() {Supplier<Employee> sup = new Supplier<Employee>() {@Overridepublic Employee get() {return new Employee();}};System.out.println("***************");System.out.println(sup.get());Supplier<Employee> sup1 = () -> new Employee();System.out.println(sup1.get());Supplier<Employee> sup2 = Employee::new;System.out.println(sup2.get());}//Function中的R apply(T t)@Testpublic void test2() {Function<Integer, Employee> func1 = id -> new Employee(id);Employee employee = func1.apply(1001);System.out.println(employee);Function<Integer, Employee> func2 = Employee::new;System.out.println(func2.apply(1002).getName());}//BiFunction中的R apply(T t,U u)@Testpublic void test3() {BiFunction<Integer, String, Employee> func1 = (id, name) -> new Employee(id, name);System.out.println(func1.apply(1001, "Tom"));BiFunction<Integer, String, Employee> func2 = Employee::new;System.out.println(func1.apply(1001, "Tom"));}//数组引用//Function中的R apply(T t)@Testpublic void test4() {Function<Integer,String[]> func1 = length -> new String[length];String[] arr1 = func1.apply(5);System.out.println(Arrays.toString(arr1));Function<Integer,String[]> func2= String[] ::new;String[] arr2 = func1.apply(10);System.out.println(Arrays.toString(arr2));}
}