定义一个学生类Student，包含三个属性姓名、年龄、性别，创建三个学生对象存入ArrayList集合中?

A：遍历集合遍历输出。
B：求出年龄最大的学生，然后将该对象的姓名变为：葫芦娃。

代码示例:

package cn.zxj.com;

public class Student {
    private String name;
    private int age;
    private String sex;

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", age=" + age +
                ", sex='" + sex + ''' +
                '}';
    }

    public Student(String name, int age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

package cn.zxj.com;


import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class Demo {

    public static void main(String[] args) {
        List list = new ArrayList();
        //添加元素到集合
        add(list);
        //遍历集合并打印
        ergodicPrint(list);
        //修改年龄最大的学生姓名为葫芦娃
        changeMaxAgeName(list);
        System.out.println("-------------");
        //遍历集合并打印
        ergodicPrint(list);

    }

    private static void changeMaxAgeName(List list) {
        Optional op = list.stream()
                .sorted((s1, s2) -> (s2.getAge()-s1.getAge()))
                .findFirst();
        Student student = op.get();
        student.setName("葫芦娃");
    }

    private static void ergodicPrint(List list) {
        for(int i = 0;i list) {
        list.add(new Student("xiaochen",20,"男"));
        list.add(new Student("xiaoli",25,"女"));
        list.add(new Student("xiaowang",22,"男"));
    }

}