[英]method does not override or implement a method from a supertype
我正在使用繼承和多態創建一個模擬員工數據庫。 嘗試覆蓋超類方法時遇到以下錯誤。
HourlyEmployee is not abstract and does not override abstract method resetWeek() in Employee
public class HourlyEmployee extends Employee
^
HourlyEmployee.java:43: error: method does not override or implement a method from a supertype
@Override
^
HourlyEmployee.java:54: error: method does not override or implement a method from a supertype
@Override
^
HourlyEmployee.java:60: error: method does not override or implement a method from a supertype
@Override
^
HourlyEmployee.java:66: error: method does not override or implement a method from a supertype
@Override
這是我的Employee Superclass和HourlyEmployee Subclass代碼
public abstract class Employee
{
protected String firstName;
protected String lastName;
protected char middleInitial;
protected boolean fulltime;
private char gender;
private int employeeNum;
public Employee (String fn, String ln, char m, char g, int empNum, boolean ft)
{
firstName = fn;
lastName = ln;
middleInitial = m;
gender = g;
employeeNum = empNum;
fulltime = ft;
}
public int getEmployeeNumber()
{
return employeeNum;
}
public void setEmployeeNumber(int empNum)
{
while (empNum <= 10000 && empNum >= 99999)
{
System.out.print ("Invalid input, please try again: ");
}
if (empNum >= 10000 && empNum <= 99999)
{
employeeNum = empNum;
}
}
public String getFirstName()
{
return firstName;
}
public String getLastName()
{
return lastName;
}
public char checkGender(char g)
{
if (g != 'M' || g != 'F')
{
g = 'F';
}
return g;
}
public char getGender()
{
return gender;
}
@Override
public boolean equals(Object e2)
{
if (this.employeeNum == ((Employee)e2).employeeNum)
{
return true;
}
else
{
return false;
}
}
@Override
public String toString()
{
return employeeNum + "\n" + lastName + ", " + firstName + "\n" + "Gender:" + gender + "\n" + "Status:" + fulltime + "\n";
}
public abstract double caclulateWeeklyPay();
public abstract void annualRaise();
public abstract double holidayBonus();
public abstract void resetWeek();
}
這是HourlyEmployee子類
public class HourlyEmployee extends Employee
{
private double wage;
private double hoursWorked;
private double additionalHours;
public HourlyEmployee(String fn, String ln, char m, char g, int empNum, boolean ft, double w, double h, double ahours)
{
super (fn, ln, m, g, empNum, ft);
wage = w;
hoursWorked = h;
hoursWorked = 0.0;
additionalHours = ahours;
}
@Override
public String toString()
{
return this.getEmployeeNumber() + "\n" + lastName + ", " + firstName + middleInitial + "\n" + "Gender: "
+ this.getGender() + "\n" + "Status: " + fulltime + "\n" + "Wage: " + wage + "\n" + "Hours Worked: " + hoursWorked + "\n";
}
//@Override
public double calculateWeeklyPay(double w, double h)
{
if (h > 40)
{
w = w * 2;
}
return w * h;
}
//@Override
public double annualRaise(double w)
{
return (w * .05) + w;
}
//@Override
public double holidayBonus(double w)
{
return w * 40;
}
//@Override
public double resetWeek(double h)
{
h = 0.0;
return h;
}
public double plusHoursWorked(double h, double ahours)
{
while (h <= 0)
{
System.out.println("Invalid value entered, please try again");
}
h += ahours;
return h;
}
}
您的Employee類有4個抽象方法,其中沒有一個是實現的(至少沒有正確實現)。 這是一個例子:
double caclulateWeeklyPay(); // in Employee
double calculateWeeklyPay(double w, double h) // in HourlyEmployee
父類應包含相同的簽名(包括參數),並且應如下所示:
public abstract double calculateWeeklyPay(double w, double h);
由於這似乎是家庭作業,我會把剩下的留給你。
只需仔細閱讀錯誤消息:
HourlyEmployee不是抽象的,不會覆蓋Employee中的抽象方法resetWeek()
它清楚地表明您的Employee
類是abstract
並且有一個抽象方法resetWeek()
。
從Employee
擴展的類HourlyEmployee
不是抽象的,因此它應該覆蓋超類的所有抽象方法,因為具體類不能有任何抽象方法。
原因是HourlyEmployee
類中的方法與超類中的方法具有不同的簽名。 因此,不會覆蓋該方法,並且編譯器不接受@Override
注釋
因為您的HourlyEmployee * 類不是抽象的 *您需要實現在EMPLOYEE抽象類中聲明的抽象方法 。 這很明顯。 你必須實現以下方法
public abstract double caclulateWeeklyPay();
public abstract void annualRaise();
public abstract double holidayBonus();
public abstract void resetWeek();
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