Constructor & Array Reference in Lambda Expression

Constructor & Array Reference in Lambda Expression

1. Constructor format:

ClassName::new

2. Constructor instance

    @Test
    public void test5(){
        //原来的方法
        Supplier<Employee> supplier = ()->new Employee();
        //构造器应用
        Supplier<Employee> supplier1 = Employee::new;

        Employee employee = supplier1.get();
        System.out.println(employee);
    }

3. Constructor description

For a class with multiple constructors, the constructor reference call is matched according to the parameter list of the functional method

4. Array reference

Type::new

    @Test
    public void test6(){
        //原来的方法
        Function<Integer,String[]> function = (x)->new String[x];
        String[] apply = function.apply(10);
        //数组引用
        Function<Integer,String[]> function1 = String[]::new;
        String[] apply1 = function1.apply(20);
        System.out.println(apply1.length);

    }