java - 构造函数继承在新对象上出现致命错误

我有3个班级：管理员，带薪雇员和雇员。管理员从受薪雇员中扩展而来，从雇员中扩展。这是它们的默认构造函数：

雇员：

public class Employee
{
private String name;
private Date hireDate;

public Employee( )
{
     name = "No name";
     hireDate = new Date("Jan", 1, 1000); //Just a placeholder.
}

/**
 Precondition: Neither theName nor theDate is null.
*/
public Employee(String theName, Date theDate)
{
    if (theName == null || theDate == null)
    {
         System.out.println("Fatal Error creating employee.");
         System.exit(0);
    }
    name = theName;
    hireDate = new Date(theDate);
}

public Employee(Employee originalObject)
{
     name = originalObject.name;
     hireDate = new Date(originalObject.hireDate);
}


}

受薪员工：

public class SalariedEmployee extends Employee
{
private double salary; //annual

public SalariedEmployee( )
{
    super( );
    salary = 0;
}

/**
 Precondition: Neither theName nor theDate are null;
 theSalary is nonnegative.
*/
public SalariedEmployee(String theName, Date theDate, double theSalary)
{
     super(theName, theDate);
     if (theSalary >= 0)
         salary = theSalary;
     else
     {
         System.out.println("Fatal Error: Negative salary.");
         System.exit(0);
     }
}

public SalariedEmployee(SalariedEmployee originalObject )
{
     super(originalObject);
     salary = originalObject.salary;
}

}

管理员：

//Create a test program that uses scanner so person can input values for the admin class.
public class Administrator extends SalariedEmployee
{
private String title;
private String responsibility;
private String supervisor;

//No argument Constructor
public Administrator( )
{
    super( );
    title = "No Title";
    responsibility = "No Responsibility";
    supervisor = "Dilbert";
}

//3 argument constructor
public Administrator(String theTitle, String theResponsibility, String theSupervisor)
{
     super( );
     if (theTitle == null || theResponsibility == null || theSupervisor == null)
     {
          System.out.println("Fatal Error creating employee.");
          System.exit(0);
     }
     title = theTitle;
     responsibility = theResponsibility;
     supervisor = theSupervisor;
}

//6 argument Constructor
public Administrator(String theName, Date theDate, double theSalary, String theTitle, String theResponsibility, String theSupervisor)
{
     super(theName,theDate,theSalary);
     title = theTitle;
     responsibility = theResponsibility;
     supervisor = theSupervisor;
}

}

我尝试使用以下方法创建一个新的管理员对象：

Administrator admin = new Administrator();

但是我收到一个致命错误。我究竟做错了什么？

最佳答案

您的Date类以无信息的方式在所有地方输出“致命错误”（直到您发布Date类代码，我们才知道）。

第一次出现致命错误是在setDate方法内部，因为dateOK为"Jan", 1, 1000返回了false。

您的monthOK方法需要"January"，因此用于默认构造函数的"Jan"无效。更改默认构造函数以使用

hireDate = new Date("January", 1, 1000);

关于java - 构造函数继承在新对象上出现致命错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/25878210/