Question

我有3个班级：管理员，受薪员工和员工。管理员从受薪员工延伸，并从员工延伸。以下是它们的默认构造函数：

员工：

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);
}


}

SalariedEmployee：

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();

但是我得到了一个致命的错误。我做错了什么？

Answer 1

您的日期类输出＆＃34;致命错误＆＃34;处于非信息方式的任何地方（在你发布你的Date类代码之前我们都不知道）。

第一次出现致命错误位于setDate方法内，因为dateOK的{{1}}返回false。

您的"Jan", 1, 1000方法需要monthOK，因此您用于默认构造函数的"January"无效。更改默认构造函数以使用

"Jan"

构造函数继承在新对象上获得致命错误

1 个答案: