请根据 Main 中对 Student 类的属性和方法的调用，补充 Student 的属性和方法。

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc  = new Scanner(System.in);

		Student student1 = new Student();
		student1.setSex(Student.SEX_FEMALE);
		student1.name = sc.next();
		student1.age = sc.nextInt();
		System.out.println(student1.toString());

		student1.setSex(Student.SEX_MALE);
		System.out.println(student1.toString());

		sc.close();
	}
}

public class Student {
    // write your code here
    public String name;
    public int age;
    private String sex;
    public static String SEX_FEMALE ="female";
    public static String SEX_MALE  = "male";

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

    @Override
    public java.lang.String toString() {
        
        return "name = " + name + ", age = " + age + ", sex = " + sex ;
    }

}