[英]Try-Catch inside a while loop in Java
因此,基本上我的代碼試圖讀取.txt文件,然后使用這些變量(長,字符串,字符串,雙精度,雙精度)創建對象。 當.txt文件中的變量不是長整數,字符串或雙精度型時,它將被寫入另一個文件中。 我已經編寫了此代碼,但沒有超出第一個catch (InputMismatchException n)
。 我的代碼有什么問題?
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.");
}
路徑文件正常。 我已將其縮短以方便理解。
如果文件已經存在,則用於PrintWriter
的構造函數實際上會覆蓋該文件。 從文檔中 :
fileName
用作此編寫器目標的文件名。 如果文件存在,它將被截斷為零 ; 否則,將創建一個新文件。 輸出將被寫入文件並被緩沖。
您應該在循環之前創建一次txtOut
,並在循環之后關閉它。 這樣,它只會被打開一次,不會為捕獲到的每個異常從頭開始。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.