因此,基本上我的代码试图读取.txt文件,然后使用这些变量(长,字符串,字符串,双精度,双精度)创建对象。当.txt文件中的变量不是长整数,字符串或双精度型时,它将被写入另一个文件中。我已经编写了此代码,但没有超出第一个catch (InputMismatchException n)
。我的代码有什么问题?
int i = 0;
ArrayList<Employee> ArrEmployee = new ArrayList<Employee>(); // array for employee objects
try {
Scanner txtIn = new Scanner(new File("payroll.txt"));
while (txtIn.hasNext()) { // looping through the payroll.txt file and creating Employee objects from its data
try {
long EmployeeNumber = txtIn.nextLong();
String EmployeeName = txtIn.next();
String LastName = txtIn.next();
double HoursWorked = txtIn.nextDouble();
double HourlyWage = txtIn.nextDouble();
if (HourlyWage > 10.35){
throw new InputMismatchException(); // throws exception if the hourly wage is less than 10.35$
}
else
ArrEmployee.add(new Employee(EmployeeNumber,EmployeeName,LastName,HoursWorked,HourlyWage)); // creates Employee objects according to the input payroll.txt
i++;
} catch (InputMismatchException n) { // catching long,strings and doubles in the payroll.txt that aren't valid
PrintWriter txtOut = new PrintWriter("payrollError.txt");
txtOut.println(Employee.EmployeeNumber + " " + Employee.EmployeeName + " " + Employee.LastName + " " + Employee.HoursWorked + " " + Employee.HourlyWage);
txtOut.close();
}
}
} catch (FileNotFoundException e) {
System.out.println("File payroll.txt was not found.");
}
路径文件正常。我已将其缩短以方便理解。
最佳答案
用于PrintWriter
的构造函数实际上会覆盖该文件(如果已存在)。从documentation:
fileName
-用作此编写器目标的文件名。如果文件存在,那么它将被截断为零大小;否则,将创建一个新文件。输出将被写入文件并被缓冲。
您应该在循环之前创建txtOut
一次,并在循环之后关闭它。这样,它只会被打开一次,不会为捕获到的每个异常从头开始。