Java:对于UML图中仅存在于父类(super class)中的抽象方法应该做什么？

Question

我有下面的 UML 图:我读过抽象方法应该由子类覆盖。当任一子类中都没有 calculateMonthlyPay() 时，我应该如何重写 calculateMonthlyPay() ？我可以创建未在 UML 图中显示的方法吗？

这是我的 Employee 及其子类 PartTimeEmp 和 FullTimeEmp 的代码，供引用。

public abstract class Employee {
    Scanner keyboard = new Scanner(System.in);
    public String name;
    public String ID;

    //Employee constructor
    public Employee(String name, String ID) {
        this.name = name;
        this.ID =  ID;
    }

    //ID setter
    public void setID(String ID) {
        ID = keyboard.nextLine();
        this.ID = ID;
    }

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

    public abstract String getStatus();

    public abstract double calculateMonthlyPay();

    @Override
    public String toString() {
        return "Employee{" + "name=" + name + ", ID=" + ID + '}';
    }
}

class PartTimeEmp extends Employee {
    public double hourlyRate;
    public int hoursPerWeek;
    //PartTimeEmp constructor
    public PartTimeEmp(String name, String ID){
        super(name, ID);
    }

    public void setHours(int hoursPerWeek) {
        this.hoursPerWeek = hoursPerWeek;
    }

    public void setRate(double hourlyRate) {
        this.hourlyRate = hourlyRate;
    }

    @Override
    public String toString() {
        return "PartTimeEmp{" + "hourlyRate=" + hourlyRate + ", hoursPerWeek=" + hoursPerWeek + '}';
    }
}

class FullTimeEmp extends Employee {
    double salary;

    //FullTimeEmp constructor
    public FullTimeEmp(String name, String ID) {
        super(name, ID);
    }

    //Set salary of employee
    public void setSalary(double salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        return "FullTimeEmp{" + "salary=" + salary + '}';
    }
}

Answer 1

UML 图仅在首先引入该方法的类中显示每个方法。否则，每个类的 UML 将显示其层次结构中所有祖先类的所有方法，这不是很方便。

因此，您绝对应该在子类中重写 calculateMonthlyPay() 和 getStatus()，否则您将无法编译代码。