我有 3 个不同的类，其方法相同，返回类型为字符串，如何通过再创建一个类来显示所有这些方法

Question

我有 3 个不同的类，其方法相同，返回类型为字符串，如何通过创建另一个类来显示所有这些方法，我尝试通过使用对象创建其他类来调用

public class SuperDepartment {
    public String departmentName() {
        return "Super Department" ;
    }
    public String getTodaysWork() {
        return "No Work as of now" ;
    }
    public String getWorkdeadline() {
        return "Nill" ;
    }
    public String isTodayAHoliday() {
        return "Today is not a holiday" ;
    }

public class AdminDepartment extends SuperDepartment {
public String  departmentName() {
        
        return "Admin department";
        
        
    }
    public String getTodaysWork() {
        return "Complete your document submission";
        
    }
    public String getWorkDeadline() {
        return "Complete by EOD";
    }
    
}

public class HrDepartment extends SuperDepartment {
public String departmentName() {
        return "Hr Department";
    }
    public String getTodaysWork() {
        return "Fill todays worksheet and mark your attendence";
    }
    public String getWorkDeadline() {
        return "Complete by EOD";
    }
    public String doActivity() {
        return "team Lunch";
    }