Java 重写 protected Setter 并消除公共(public) Setter

Question

人员类别:

public class Person {


    private String firstName;
    private String lastName;

    public Person(String firstname,String lastname) throws InvalidDataException
    {
        setFirstname( firstname);
        setLastname(lastname);
    }


    public void personFirstName(String firstName) throws InvalidDataException { 
        setFirstname(firstName);
    }

    public void personLastName(String lastname) throws InvalidDataException {

        setLastname(lastname);
    }

    public String getFirstName() {
        return firstName;
    }

    public String getlasttName()
    {
        return lastName;
    }

    protected final void setFirstname(String firstname) throws InvalidDataException{
         if( firstname == null ||firstname.length() < 1) {
                throw new InvalidDataException("First Name Cannot be Empty");
         }
          this.firstName=firstname; 

    }

    protected final void setLastname(String lastname) throws InvalidDataException {

         if( lastname == null ||lastname.length() < 1) {
                throw new InvalidDataException("Last Name Cannot be Empty");

         }

         this.lastName = lastname;
    }



}

教授类(class):

public class Professor extends Person {


    private String  professorID;



    public Professor(String professorID,String firstname, String lastname) throws InvalidDataException {
        super(firstname, lastname);
        // TODO Auto-generated constructor stub
        setProfessorID(professorID);
    }

    public void setID(String professorID) throws InvalidDataException{

        setProfessorID(professorID);
    }

    public String getID()
    {
        return this.professorID;
    }

    private void setProfessorID(String ID) throws InvalidDataException{
         if( ID == null ||ID.length() < 1) {
                throw new InvalidDataException("ID Cannot be Empty");
         }
          this.professorID=ID; 

    }

    public void printData()
    {
         System.out.println("Professor ID: " + this.getID() + " First Name: " + this.getFirstName() + " Last Name: " + this.getlasttName());
    }

}

我已经做了一些关于实现 setter 并在我的子类中调用它们的研究。通过声明它们是 protected 和最终的，我可以防止子类覆盖它并执行不需要的行为。我的问题是，我现在可以摆脱 personFirstName() 和 personLastName() 吗？我的构造函数不使用它，它们调用 protected 最终 setFirstname 和 setLastname()。摆脱公共(public) setter 会在以后的开发中引起问题吗？

Answer 1

您说过您的目标是避免调用构造函数中可能被子类覆盖的方法。如果是这样，我会这样处理:

public Person(String firstName, String lastName) {
    this.privateSetFirstName(firstName);
    this.privateSetLastName(lastName);
}
private void privateSetFirstName(String firstName) {
    // ...your logic for setting the field...
}
private void privateSetLastName(String lastName) {
    // ...your logic for setting the field...
}
public void setFirstName(String firstName) {
    this.privateSetFirstName(firstName);
}
public void setLastName(String lastName) {
    this.privateSetLastName(lastName);
}

例如，使标准制定者成为标准，并将特定于实现的详细信息保留在实现中的私有(private)方法中。