定义一个Person类，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 toString(方法，并分别创建对象进行测试。用Java语言进行编写

在Java中，我们可以按照这样的结构来定义和实现这个需求：

// 定义 Person 类作为父类
class Person {
    private String name;
    private String gender;
    private int age;

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

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

// 继承 Person 类的 Teacher 类
class Teacher extends Person {
    private String title;
    private String department;

    // 构造方法
    public Teacher(String name, String gender, int age, String title, String department) {
        super(name, gender, age); // 调用父类构造方法
        this.title = title;
        this.department = department;
    }

    // toString 方法
    @Override
    public String toString() {
        return "Teacher{" +
                "super." + super.toString() + // 使用父类的 toString 输出 +
                ", title='" + title + '\'' +
                ", department='" + department + '\'' +
                '}';
    }
}

// 继承 Person 类的 Student 类
class Student extends Person {
    private String studentId;
    private String className;

    // 构造方法
    public Student(String name, String gender, int age, String studentId, String className) {
        super(name, gender, age);
        this.studentId = studentId;
        this.className = className;
    }

    // toString 方法
    @Override
    public String toString() {
        return "Student{" +
                "super." + super.toString() + // 使用父类的 toString 输出 +
                ", studentId='" + studentId + '\'' +
                ", className='" + className + '\'' +
                '}';
    }
}

// 测试部分
public class Main {
    public static void main(String[] args) {
        // 创建 Person 对象
        Person person = new Person("张三", "男", 30);
        System.out.println(person);

        // 创建 Teacher 对象
        Teacher teacher = new Teacher("李四", "女", 35, "教授", "数学系");
        System.out.println(teacher);

        // 创建 Student 对象
        Student student = new Student("王五", "男", 20, "1001", "一班");
        System.out.println(student);
    }
}

运行上述代码，会打印出每个对象的详细信息。