请问一下这个java代码怎么写！thanks！

package com.csdn;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * 
 * @作者:Roc-xb
 * @联系QQ:327844761
 * @微信公众号：ewbang
 * @若有帮助望采纳,谢谢!
 */
public class Student {
    /**
     * 姓名
     */
    private String name;
    /**
     * 学号
     */
    private String sno;
    /**
     * 成绩
     */
    private double score;

    public String getName() {
        return name;
    }

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

    public String getSno() {
        return sno;
    }

    public void setSno(String sno) {
        this.sno = sno;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public Student(String name, String sno, double score) {
        super();
        this.name = name;
        this.sno = sno;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student [name=" + name + ", sno=" + sno + ", score=" + score + "]";
    }

    public static void main(String[] args) {
        List<Student> students = new ArrayList<>();
        // 向集合中添加3名学生
        students.add(new Student("张三", "101", 99));
        students.add(new Student("李四", "102", 59));
        students.add(new Student("王五", "103", 88));
        // 在第二个学生前面新增2名学生
        students.add(1, new Student("张三1", "104", 91));
        students.add(2, new Student("张三2", "105", 92));
        // 删除最后一名学生的信息
        students.remove(students.size() - 1);
        // 使用Iterator打印输出所有学生信息
        Iterator<Student> iterator = students.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }

    }

}