利用Java的代码定义一个person类，包含姓名、性别、年龄等字段；继承person类，设计teacher类，增加：职称、部门等字段；继承person类设计Student类增加，学号、班级等字段，定义各类的构造方法和to String()方法，并分贝创建对象进行测试

好的，这是一个关于Java编程的问题。请看如下代码：

public class Person {
    private String name;
    private String gender;
    private int age;

    public Person(String name, String gender, int age) {
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                '}';
    }
}

public class Teacher extends Person {
    private String title;
    private String department;

    public Teacher(String name, String gender, int age, String title, String department) {
        super(name, gender, age);
        this.title = title;
        this.department = department;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + super.getName() + '\'' +
                ", gender='" + super.getGender() + '\'' +
                ", age=" + super.getAge() +
                ", title='" + title + '\'' +
                ", department='" + department + '\'' +
                '}';
    }
}

public class Student extends Person {
    private String studentID;
    private String className;

    public Student(String name, String gender, int age, String studentID, String className) {
        super(name, gender, age);
        this.studentID = studentID;
        this.className = className;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + super.getName() + '\'' +
                ", gender='" + super.getGender() + '\'' +
                ", age=" + super.getAge() +
                ", studentID='" + studentID + '\'' +
                ", className='" + className + '\'' +
                '}';
    }
}

// 在主函数中进行对象的测试
public class Main {
    public static void main(String[] args) {
        Person person = new Person("小明", "男", 18);
        System.out.println(person);

        Teacher teacher = new Teacher("张老师", "女", 30, "高级教师", "物理系");
        System.out.println(teacher);

        Student student = new Student("小红", "女", 16, "S001", "高一1班");
        System.out.println(student);
    }
}

以上代码就是一个简单的实现，你可以根据需要进行修改。