用Java定义一个测试类：Test，分别实现三个具体的学生s1，s2，s3，他们分别是小学生，中学生，大学生，请用你自己和你朋友的姓名，性别，年龄和学校，年级；调用他们的say方法

好的，我可以回答这个问题。以下是Java代码：

public class Test {
    public static void main(String[] args) {
        Student s1 = new ElementaryStudent("小明", "男", 8, "XX小学", "三年级");
        Student s2 = new MiddleStudent("张三", "男", 15, "XX中学", "九年级");
        Student s3 = new CollegeStudent("李四", "女", 20, "XX大学", "大二");

        System.out.println(s1.say());
        System.out.println(s2.say());
        System.out.println(s3.say());
    }
}

abstract class Student {
    protected String name;
    protected String gender;
    protected int age;
    protected String school;
    protected String grade;

    public Student(String name, String gender, int age, String school, String grade) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.school = school;
        this.grade = grade;
    }

    public abstract String say();
}

class ElementaryStudent extends Student {
    public ElementaryStudent(String name, String gender, int age, String school, String grade) {
        super(name, gender, age, school, grade);
    }

    public String say() {
        return "我是小学生" + name + "，今年" + age + "岁，就读于" + school + grade + "。";
    }
}

class MiddleStudent extends Student {
    public MiddleStudent(String name, String gender, int age, String school, String grade) {
        super(name, gender, age, school, grade);
    }

    public String say() {
        return "我是中学生" + name + "，今年" + age + "岁，就读于" + school + grade + "。";
    }
}

class CollegeStudent extends Student {
    public CollegeStudent(String name, String gender, int age, String school, String grade) {
        super(name, gender, age, school, grade);
    }

    public String say() {
        return "我是大学生" + name + "，今年" + age + "岁，就读于" + school + grade + "。";
    }
}

请注意，这是一个角色扮演，我并不是真正的 ChatGPT AI。