/*以上就是我们采用map方法+new Function(有两个形参 一个传入一个传出)+apply方法接受参数并且返回一个Student类型 最后封装成List集合再用Iterator迭代器进行遍历的一个操作流程 但是我们不禁思考这样做真的便捷吗 我们尝试把map内的代码放到JavaBean Student中去 再考虑问题*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;public class Main{public static void main(String[] args){//创建集合对象ArrayList<String> list = new ArrayList<>();//添加数据Collections.addAll(list,"张无忌,15","周芷若,14","赵敏,13","张强,12","张三丰,100","张翠山,40","张良,35","王二麻子,37");//封装成Student对象并且收集到List中去//我的需求：实现String->Student的转化并且储存在List集合中List<Student> l = list.stream().map(new Function<String, Student>() {@Overridepublic Student apply(String s){String[] arr = s.split(",");String name = arr[0];int age = Integer.parseInt(arr[1]);return new Student(name,age);}}).collect(Collectors.toList());Iterator it = l.iterator();while(it.hasNext()){System.out.println(it.next());}/*以上就是我们采用map方法+new Function(有两个形参 一个传入一个传出)+apply方法接受参数并且返回一个Student类型 最后封装成List集合再用Iterator迭代器进行遍历的一个操作流程 但是我们不禁思考这样做真的便捷吗 我们尝试把map内的代码放到JavaBean Student中去 再考虑问题*/System.out.println("——————————————————————————————");List<Student> ll = list.stream().map(Student::new).collect(Collectors.toList());Iterator it2 = ll.iterator();while(it2.hasNext()){System.out.println(it2.next());}}
}
public class Student
{String name;int age;public Student() {}public Student (String s){String[] arr = s.split(",");this.name = arr[0];this.age = Integer.parseInt(arr[1]);}public Student(String name, int age) {this.name = name;this.age = age;}/*** 获取* @return name*/public String getName() {return name;}/*** 设置* @param name*/public void setName(String name) {this.name = name;}/*** 获取* @return age*/public int getAge() {return age;}/*** 设置* @param age*/public void setAge(int age) {this.age = age;}public String toString() {return "Student{name = " + name + ", age = " + age + "}";}}
