定义Person的子类，如学生Student/教师Teacher/雇员Employee等

为了使`Person`抽象类更实际，我们可以为它创建多个子类，比如`Student`、`Teacher`和`Employee`，每个子类继承`Person`并实现`getCareer()`方法以表示特定的职业：

// 学生类Student
public class Student extends Person {
    // 添加可能特有的属性，如学号或专业
    private String studentId;
    private String major;

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

    @Override
    public String getCareer() {
        return "学生";
    }

    // 如果需要，也可以添加更多的方法，例如显示学号或专业
    public void displayExtraInfo() {
        System.out.println("学号：" + studentId);
        System.out.println("专业：" + major);
    }
}

// 教师类Teacher
public class Teacher extends Person {
    private String teacherId;
    private String subject;

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

    @Override
    public String getCareer() {
        return "教师";
    }

    public void displaySubject() {
        System.out.println("教课科目：" + subject);
    }
}

// 雇员类Employee
public class Employee extends Person {
    private String employeeId;
    private String jobTitle;

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

    @Override
    public String getCareer() {
        return "员工";
    }

    public void displayJobTitle() {
        System.out.println("职位：" + jobTitle);
    }
}

这些子类都重写了父类`getCareer()`方法，提供了自己的职业描述，并可能还添加了额外的属性和展示方法。