用Java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toString()方法，并分贝创建对象进行测试

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以下是Java代码实现：

// Person类
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;
    }

    // getter和setter方法
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

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

// Teacher类
public class Teacher extends Person {
    private String jobTitle;
    private String department;

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

    // getter和setter方法
    public String getJobTitle() {
        return jobTitle;
    }

    public void setJobTitle(String jobTitle) {
        this.jobTitle = jobTitle;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "jobTitle='" + jobTitle + '\'' +
                ", department='" + department + '\'' +
                "} " + super.toString();
    }
}

// Student类
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;
    }

    // getter和setter方法
    public String getStudentId() {
        return studentId;
    }

    public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    @Override
    public String toString() {
        return "Student{" +
                "studentId='" + studentId + '\'' +
                ", className='" + className + '\'' +
                "} " + super.toString();
    }
}

// 测试
public class Test {
    public static void main(String[] args) {
        Person person = new Person("张三", "男", 20);
        System.out.println(person);

        Teacher teacher = new Teacher("李四", "女", 30, "教授", "计算机系");
        System.out.println(teacher);

        Student student = new Student("王五", "男", 18, "001", "计算机科学与技术");
        System.out.println(student);
    }
}

以上代码实现了定义Person、Teacher和Student三个类，并且实现了各自的构造方法和toString()方法。同时，分别创建了person、teacher和student三个对象，并且在main方法中对它们进行了输出测试。