我有三个班，一人班，主班和多纳班，
人员等级

public class Person{

private String name;
    private String  dateOfBirth;
    private String  gender;
    private String  mobileNumber;
    private String  bloodGroup;

    Person(){

    }

     public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDateOfBirth() {
        return dateOfBirth;
    }

    public void setDateOfBirth(String dateOfBirth) {
        this.dateOfBirth = dateOfBirth;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getMobileNumber() {
        return mobileNumber;
    }

    public void setMobileNumber(String mobileNumber) {
        this.mobileNumber = mobileNumber;
    }

    public String getBloodGroup() {
        return bloodGroup;
    }

    public void setBloodGroup(String bloodGroup) {
        this.bloodGroup = bloodGroup;
    }

    public void displayPersonDetails( )
    {
        System.out.println("Name : " + name);
        System.out.println("Date of Birth : " +dateOfBirth);
        System.out.println("Gender : " +gender);
        System.out.println("Mobile Niumber : " +mobileNumber);
        System.out.println("Blood Group : "+bloodGroup);
    }

}

施主类

class Donor extends Person
{

   private String bloodBankName;
    private String  donorType;
    private String  donationDate;

    public Donor() {
    }

    public String getBloodBankName() {
        return bloodBankName;
    }

    public void setBloodBankName(String bloodBankName) 
    {
        this.bloodBankName = bloodBankName;
    }

    public String getDonorType() {
        return donorType;
    }

    public void setDonorType(String donorType) {
        this.donorType = donorType;
    }

    public String getDonationDate() {
        return donationDate;
    }

    public void setDonationDate(String donationDate) {
        this.donationDate = donationDate;
    }

    public void displayDonationDetails( ) {             
        System.out.println("Donation Details :");
        super.displayPersonDetails();
        System.out.println("Blood Bank Name : "+bloodBankName);
        System.out.println("Donor Type : "+donorType);
        System.out.println("Donation Date : "+donationDate);

    }

}

主要类别

package Eboxex1;

import java.util.Scanner;

public class Main { 
    public static void main(String[] args){ 
      Donor d=new Donor();
       Person p=new Person();
    Scanner sc=new Scanner(System.in);

    System.out.println("Enter the name :");
    p.setName(sc.nextLine());

    System.out.println("Enter Date of Birth :");
    p.setDateOfBirth(sc.nextLine());
    System.out.println("Enter Gender :");
    p.setGender(sc.nextLine());

    System.out.println("Enter Mobile Number :");
    p.setMobileNumber(sc.nextLine());

    System.out.println("Enter Blood Group :");
    p.setBloodGroup(sc.nextLine());

    System.out.println("Enter Blood Bank Name :");

 d.setBloodBankName(sc.nextLine());

    System.out.println("Enter Donor Type :");

    d.setDonorType(sc.nextLine());

    System.out.println("Enter Donation Date :");

    d.setDonationDate(sc.nextLine());

    d.displayDonationDetails(); 

    sc.close();
    } 
}

输出

我不知道是什么错误。
当我们运行main方法时，意味着它将询问用户的详细信息，然后 Name, Date of Birth, Gender, Mobile Number, Blood Group 你要去医院吗 Person 类（getter和setter方法），然后 Blood Bank Name, Donor Type, Donation Date 你要去医院吗 Donor 类（getter和setter方法），然后 displayDonationDetails 在主类中调用。在这个方法中，我们必须调用person类中的细节。但该方法无法获取 Person 类到 Donor 类方法