Java字符串分割，存入集合，打印内容

有字符串“小明,男,12,1班;小红女1,小强,男,12,2班"
将字符串分隔,保存到 Student集合中( Student类需求定义),按照年龄降序打印输出每个对象的信息。(字符串转换为整型方法:
Integervalueof(s);)

public static void main(String[] args) {
        String str = "小明,男,12,1班;小红,女,14,3班;小强,男,10,2班";
        String[] strArr = str.split(";");
        List<Student> list = new ArrayList<>();
        for (int i = 0; i < strArr.length; i++) {
            String[] studentArr = strArr[i].split(",");
            Student student = new Student(studentArr[0], studentArr[1], Integer.valueOf(studentArr[2]), studentArr[3]);
            list.add(student);
        }
        list.sort((s1, s2) -> s2.getAge() - s1.getAge());
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).toString());
        }
    }


//学生类定义
public class Student {
    private String name;
    private String sex;
    private Integer age;
    private String className;

    public Student() {

    }

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

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    public String toString() {
        return this.name + "," + this.sex + "," + this.age + "," + this.className;
    }
}