1. 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保持一致。
抽象方法的返回值类型即为构造器所属类的类型

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@Test
    public void test(){
        //bean对象需要含有对应的无参构造函数
        //lambda表达式
        Supplier<Employee> supplier=()->new Employee(3,"xiaobaicai",23,5000d);
        System.out.println("________________________________");

        //构造器引用
        Supplier<Employee> supplier1=Employee::new;
        System.out.println(supplier1.get());
    }

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@Test
    public void test2(){
        Employee employee2=new Employee();
        //传统的lambda表达式
        Function<Integer,Employee> function=id->new Employee();
        Employee employee=function.apply(100);
        System.out.println(employee);
        System.out.println("___________________________________");

        //构造器引用  
       //bean必须含有对应的有参构造
        Function<Integer,Employee> function1=Employee::new;
        Employee employee1 = function1.apply(21);
        System.out.println(employee1);
    }

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 @Test
    public void test3(){
        //lambda表达式
        BiFunction<Integer,String,Employee> function=(id,name)->new Employee(id,name);
        Employee employee = function.apply(1, "你好");
        //构造方法引用
        BiFunction<Integer,String,Employee> function2=Employee::new;
    }

2.数组引用
大家可以把数组看做一个特殊的类，则写法与构造器引用一致

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 @Test
    public void test4(){
        //数组引用
        //Function中的R apply(T t)
        //1.lambda表达式的写法
        Function<Integer,String[]> function=length-> new String[length];
        String[] strings = function.apply(10);
        System.out.println(Arrays.toString(strings));

        System.out.println("________________________________");
        Function<Integer,String[]>function1=String[]::new;
        String[] strings1 = function1.apply(5);
    }