假设教师工作证包括编号、姓名、性别、出生年月、职务和签发时间；学生证包括编号、姓名、性别、出生年月、系别、入校时间。请你为教师工作证与学生工作证设计一个类结构，尽可能保证代码的重用率，并输出教师工作证和学生工作证信息。

我们可以创建两个基类，如`IdentityCard`，然后分别派生出`TeacherCertificate`和`StudentCertificate`。这样可以利用继承和封装的原则，提高代码的重用性和灵活性。以下是基础的设计：

// 基础身份卡类
public abstract class IdentityCard {
    private String id;
    private String name;
    private String gender;
    private Date birthDate;
    
    // 共享字段和构造函数
    public IdentityCard(String id, String name, String gender, Date birthDate) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.birthDate = birthDate;
    }
    
    // 获取和设置公共字段的方法
    public String getId() { return id; }
    public void setId(String id) { this.id = id; }
    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 Date getBirthDate() { return birthDate; }
    public void setBirthDate(Date birthDate) { this.birthDate = birthDate; }

    // 简单的信息打印方法，供所有子类重写
    public abstract String printInfo();
}

// 教师工作证类
public class TeacherCertificate extends IdentityCard {
    private String position;
    private Date issueTime;

    public TeacherCertificate(String id, String name, String gender, Date birthDate, String position, Date issueTime) {
        super(id, name, gender, birthDate);
        this.position = position;
        this.issueTime = issueTime;
    }

    @Override
    public String printInfo() {
        return "教师工作证:\nID: " + id + "\n姓名: " + name + "\n性别: " + gender + "\n出生日期: " + birthDate + "\n职务: " + position + "\n签发时间: " + issueTime;
    }
}

// 学生证类
public class StudentCertificate extends IdentityCard {
    private String department;
    private Date enrollmentDate;

    public StudentCertificate(String id, String name, String gender, Date birthDate, String department, Date enrollmentDate) {
        super(id, name, gender, birthDate);
        this.department = department;
        this.enrollmentDate = enrollmentDate;
    }

    @Override
    public String printInfo() {
        return "学生证:\nID: " + id + "\n姓名: " + name + "\n性别: " + gender + "\n出生日期: " + birthDate + "\n系别: " + department + "\n入学时间: " + enrollmentDate;
    }
}

现在，你可以创建具体的教师和学生证实例，并调用他们的`printInfo()`方法来获取详细信息。