优雅的使用Lambda .map this调用方法

1. 示例代码

import com.alibaba.fastjson.JSON;
import com.example.demo.Demo.dto.Student;
import com.example.demo.pojo.StudentPlus;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

public class map {
    public static void main(String[] args) {
        Student stu1 = new Student();
        stu1.setId(1);
        stu1.setName("张三");
        stu1.setDate(String.valueOf(new Date()));

        Student stu2 = new Student();
        stu2.setId(2);
        stu2.setName("李四");
        stu2.setDate(String.valueOf(new Date()));

        //装载学生类
        List<Student> stuList = new ArrayList<>();
        Collections.addAll(stuList, stu1, stu2);

        List<StudentPlus> plusList = new map().obj(stuList);
        for (int i = plusList.size() - 1; i >= 0; i--) {
            System.out.println("编号: " + i + ", 数据: " + JSON.toJSON(plusList.get(i)));
        }

    }

    //聚合方法
    private List<StudentPlus> obj(List<Student> stuList) {
        return stuList.stream().map(this::conversion).collect(Collectors.toList());
    }

    //转换方法
    private StudentPlus conversion(Student stu) {
        StudentPlus studentPlus = new StudentPlus();
        studentPlus.setId(stu.getId());
        studentPlus.setName(stu.getName());
        studentPlus.setDate(new Date(stu.getDate()));
        return studentPlus;
    }
    //输出： 编号: 1, 数据: {"date":1626800157000,"name":"李四","id":2} 《----》 编号: 0, 数据: {"date":1626800157000,"name":"张三","id":1}
}