package com.example.demo.java8;

import org.junit.Test;

import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;

/**
 * 构造器引用
 *
 * 抽象方法的形参列表和 构造器的形参列表一致
 * 抽象方法的返回值为构造器的类型
 *
 */
public class ConstructorReference {

    @Test
    public void test1(){
        Supplier<Employee> s1 = () -> new Employee(12,"威威",78d);
        System.out.println(s1.get());

        //空参构造器
        Supplier<Employee> s2 = Employee::new;
        System.out.println(s2.get());
    }

    @Test
    public void test2(){
        Function<Integer,Employee> fun1 = id -> new Employee(id);
        System.out.println(fun1.apply(789));

        Function<Integer,Employee> fun2 = Employee::new;
        System.out.println(fun2.apply(789));
    }

    @Test
    public void test3(){
        BiFunction<Integer,String,Employee> bi1 = (id,name) -> new Employee(id,name);
        System.out.println(bi1.apply(12, "单点的"));

        BiFunction<Integer,String,Employee> bi2 = Employee::new;
        System.out.println(bi2.apply(12, "单点的"));

    }
}