Java繼承和super（）未按預期工作

Question

對於作業分配，我正在處理以下內容。這是一個指定的班級結構，我知道這不是一個遠射最好的設計。

Class   | Extends   | Variables 
-------------------------------------------------------- 
Person   | None   | firstName, lastName, streetAddress, zipCode, phone 
CollegeEmployee | Person   | ssn, salary,deptName 
Faculty   | CollegeEmployee | tenure(boolean) 
Student   | person   | GPA,major 

所以在學院類...

public class Faculty extends CollegeEmployee 
{ 
     protected String booleanFlag; 
     protected boolean tenured; 
     public Faculty(String firstName, String lastName, String streetAddress, 
        String zipCode, String phoneNumber,String ssn, 
        String department,double salary) 
     { 
      super(firstName,lastName,streetAddress,zipCode,phoneNumber, 
       ssn,department,salary); 
      String booleanFlag = JOptionPane.showInputDialog 
           (null, "Tenured (Y/N)?"); 
      if(booleanFlag.equals("Y")) 
      tenured = true; 
      else 
      tenured = false; 
     } 
} 

這是我的理解是super()在Faculty將允許訪問變量CollegeEmployee以及Person。使用上面的代碼，當我僅包含Person變量時，它編譯得很好。只要我嘗試使用ssn, department, or salary，我會收到以下編譯錯誤。

Faculty.java:15: error: constructor CollegeEmployee in class CollegeEmployee can not be applied to the given types: 
      super(firstName,lastName,streetAddress,zipCode,phoneNumber,ssn,department,salary); 
                          ^
Required: String,String,String,String,String 
    Found: String,String,String,String,String,String,String,String 
    reason: actual and formal argument lists differ in length 

我完全被這個錯誤困惑......這是真實的和正式的嗎？ Person有五個參數，CollegeEmployee有3個參數，所以我的猜測是有些參數如何通過，但我不確定從何處開始修復它。我錯過了什麼？

這裏是我的CollegeEmployee類

import java.util.*; 
import javax.swing.*; 
// 
public class CollegeEmployee extends Person 
{ 
    protected String ssn; 
    protected String sal; 
    protected double annSalary; 
    protected String department; 
// 
    public CollegeEmployee(String firstName, String lastName, 
          String streetAddress, String zipCode, 
          String phoneNumber) 
    { 
      super(firstName,lastName,streetAddress,zipCode,phoneNumber); 
      ssn = JOptionPane.showInputDialog(null, "Enter SSN "); 
      department = JOptionPane.showInputDialog 
         (null, "Enter department: "); 
      sal = JOptionPane.showInputDialog(null, "Enter salary: "); 
     annSalary = Double.parseDouble(sal); 
    } 
// 
    public void setSSN(String ssn) 
    {   this.ssn = ssn;   } 
    public void setAnnSalary(double annSalary) 
    {  this.annSalary = annSalary;  } 
    public void setDepartment(String department) 
    {  this.department = department; } 
// 
    public String getSSN() 
    {  return ssn;    } 
    public double getAnnSalary() 
    {  return annSalary;   } 
    public String getDepartment() 
    {  return department;   } 
// 
    public void display() 
    { 
     super.display(); 
     JOptionPane.showMessageDialog 
     (null, "\nSSN: " + getSSN() + "\nAnnual Salary: " 
      + getAnnSalary() + "\nDepartment: " + getDepartment(), 
      "Information", JOptionPane.QUESTION_MESSAGE); 
    } 
} 

Answer 1

你在你的構造年底做出一個偶然的;：

 public Faculty(String firstName, String lastName, String streetAddress, String zipCode, String phoneNumber,String ssn, 
      String Department,double salary); // <--- this has to go 

而且隨着你在你的構造String Department評論指出的那樣，但你通過department（不正確的大寫字母），將您的構造函數參數重命名爲String department

Answer 2

在構造函數聲明行的末尾取出;：

public Faculty(String firstName, String lastName, String streetAddress, String zipCode, String phoneNumber,String ssn,String Department,double salary); 
//----------------------------------------------------------------------------------------------------------------------------------------------------^ 

Answer 3

卸下「;」在'結束時，雙倍工資）;'

public Faculty(String firstName, String lastName, String streetAddress, String zipCode, String phoneNumber,String ssn,String Department,double salary); <--- remove this 
     { 

Answer 4

你的超類CollegeEmployee需要有以下八個參數，構造也參數類型應與

public class CollegeEmployee 
{ 
    public CollegeEmployee(String firstName, String lastName, String streetAddress, String zipCode, 
         String phoneNumber, String ssn, String department, double salary) 
    { 
     // do stuff 
    } 
}