用java声明一个学生类，包括name、sex、birthday；showStudent()可以打印学生的姓名、性别和实际周岁年龄

以下是Java代码：

import java.time.LocalDate;
import java.time.Period;

public class Student {
    private String name;
    private String sex;
    private LocalDate birthday;

    // 构造方法
    public Student(String name, String sex, LocalDate birthday) {
        this.name = name;
        this.sex = sex;
        this.birthday = birthday;
    }

    // getter和setter方法
    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 LocalDate getBirthday() {
        return birthday;
    }

    public void setBirthday(LocalDate birthday) {
        this.birthday = birthday;
    }

    // 计算年龄的方法
    public int getAge() {
        LocalDate today = LocalDate.now();
        Period age = Period.between(birthday, today);
        return age.getYears();
    }

    // 打印学生信息的方法
    public void showStudent() {
        System.out.println("姓名：" + name);
        System.out.println("性别：" + sex);
        System.out.println("年龄：" + getAge() + "岁");
    }
}