当我在我的测试器类中使用数组排序函数时，我遇到了一个错误。
import java.util.Arrays;
public class tester implements EmployeeInfo
{
public static void main(String[] args) throws CloneNotSupportedException
{
Employee[]emps = new Employee[9];
double sum=0,total=0;
emps[0]= new Staff("Chan, Scott","123",'M',1959,2,23,35.00);
emps[1]= new Staff("Salinas, Brian","456",'F',1964,7,12,30.00);
emps[2]= new Staff("Weir, Allen","789",'M',1970,6,2,22.00);
emps[3]= new Faculty("Im, Lee", "243", 'F',1962,4,27, "Full","Ph.d",
"Engineering", 3);
emps[4]= new Faculty("Bui, Trung","791" , 'F', 1975,3,14,
"Associate","Ph.d","English", 1);
emps[5] = new Faculty("Monreno, Maria", "623", 'F', 1980,5,22,
"Assistant","MS","Physical Education", 0);
emps[6]= new Partime("Lee, Chesong", "455", 'F',
1977,8,10,35,20);
emps[7]= new Partime("Garcia, Frank", "678", 'F',
1987,9,15,30,25);
emps[8] = new Partime("Alquilo, Roscoe", "945", 'M',
1988,9,15,20,30);
/**
* Display Staff, faculty, and Part-time
*/
for(int i = 0; i<emps.length;i++)
{
if(emps[i] instanceof Staff)
{
System.out.println("\n"+emps[i]);
}//end of if statement
if(emps[i] instanceof Faculty)
{
System.out.println("\n"+emps[i]);
}//end of if statement
}// end of for loop
//b
System.out.println("\nTotal montly Salary for all employees");
for(int i = 0; i<emps.length; i++)
{
sum = emps[i].monthlyEarning()+sum;
}
System.out.println("$"+sum);
//c
System.out.println("\nTotal monthly salary for all faculuty");
for(int i = 0; i<emps.length;i++)
{
if(emps[i] instanceof Faculty)
{
total = emps[i].monthlyEarning()+total;
}
}
System.out.println("$"+total);
//d Duplicate a faculty object. test the duplication
Faculty f1 = (Faculty)emps[4];
Faculty f2 = (Faculty)f1.clone();
Education dupl = new Education("Bachelor",
"Airforce",2);
f2.setEducation(dupl);
System.out.println("\nD Duplicate a Faculty Object"
+"\n"+f2.toString());
//E Verify two staff objects are the same
System.out.println("\nE.Verify two staff objects ");
Staff s1 = (Staff)emps[6];
Staff s2 = (Staff)s1.clone();
Staff s3 = new Staff("Victor Tran", "456", 'M',
1993, 5, 20,60);
if(s1.getbirthday()==s2.getbirthday())
{
System.out.print("\nThe two staff objects " +
" birthdays"+ " are the same "
+"therefore "+true+"\n");
}
if(s3.getbirthday()==s1.getbirthday())
{
System.out.print(true);
}
//F Sort employees by ascending employee ID
System.out.println("\nSort employees by ID");
Arrays.sort(emps);
for(int i=0;i<emps.length;i++)
{
System.out.println("\n"+emps[i]);
}
错误输出为
线程“主”java.lang.ClassCastException 中的异常：工作人员无法在 java.util.Arrays.mergeSort(Arrays.java:1144) 处的 java.util.Arrays.mergeSort(Arrays.java:第1155章
我的员工班级看起来像这样：
public class Staff extends Employee implements EmployeeInfo,Cloneable
{
private double hourlyRate;
/**
* Default Constructor
*/
public Staff()
{
super();
hourlyRate = 0.0;
}
/**
* Argument Constructor
* @param name
* @param number
* @param g
* @param date
* @param rate
*/
public Staff(String name, String number, char g,
int year, int month, int day,double rate)
{
super(name,number,g,year,month,day);
hourlyRate = rate;
}
/**
* Sets the hourly rate
* @param rate
*/
public void setHourlyRate(double rate)
{
hourlyRate = rate;
}
/**
* Get the hourly rate
* @return hourlyRate
*/
public double getHourlyRate()
{
return hourlyRate;
}
public double monthlyEarning()
{
double salary = STAFF_MONTHLY_HOURS_WORKED* hourlyRate;
return salary;
}
public String toString()
{
return super.toString() +"\nFull Time"+"\nMonthly Salary: $"
+ monthlyEarning()+"\nHourly Rate: $"+hourlyRate;
}
public Object clone() throws CloneNotSupportedException
{
Staff s = (Staff)super.clone();
return s;
}
}// End of Staff Class