将一个输出循环到另一个输出。Java中的txt文件

Question

这是我的代码：

import java.io.*;
import java.util.*;

public class Main {
public static void main(String[] args){

    ArrayList<Employee> ArrEmployee = new ArrayList<Employee>(); //  array for employee objects

        try {
            Scanner txtIn = new Scanner(new File("payroll.txt"));
            PrintWriter txtOut = new PrintWriter("payrollError.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
                }
                catch (InputMismatchException n) { // catching long,strings and doubles in the payroll.txt that aren't valid
                    txtOut.println(Employee.EmployeeNumber + " " + Employee.EmployeeName + " " + Employee.LastName + " " + Employee.HoursWorked + " " + Employee.HourlyWage);
                    System.out.println("lol");
                      }
                txtOut.close();
            }

        } catch (FileNotFoundException e) {
            System.out.println("File payroll.txt was not found.");

            }

          }

        }

我正在尝试输出到一个。txt文件名为payrollError。但是由于某种原因，while循环会无限继续

我似乎在我的主课上找不到这个问题，任何帮助都将不胜感激

这是我工资单上的代码。txt:

31718 PHILLIP LENNOX 55.0 20.00
11528 NANCY TROOPER 40.0 10.45
16783 JOHN CONNAUGHT 30.5 10.00
10538 PETER DUNCAN 45.0 10.75
21O15 JAMES HAROLD 32.0 10.50
61326 HARRY KUHN 25.0 12.30
82465 MICHELLE BENOIT 50.0 18.50
31816 DANIELLE RAYMOND 35.5 15.25
73745 JACK O'TOOLE 28.0 11.50
81514 VICTORIA HALL 48.5 17.50
71854 ALI MOHUMAD 35.0 10.75
92012 ALLAN MARS 36.0 15.00
52853 MICHAEL BOONE 60.5 17.50
41714 JULIE HART 25.0 10.50
58342 MIKE HEINZ 28.2 16.85
62080 PIETRO SULA 32.5 11.50
21638 MICHEL RAE 40.5 12.50
52726 MITCHELL HACKETT 23,7 12.05

基本上，它应该逐行循环这些（long、string、string、double、double），找到任何无效的值，比如写为23,7而不是23.7的double，并将其输出到我的文件payrollError。txt

我的员工类别：

public class Employee {

     public static long EmployeeNumber;
     public static String EmployeeName;
     public static String LastName;
     public static double HoursWorked;
     public static double HourlyWage;

    public Employee(long EmployeeNumber, String EmployeeName, String LastName, double HoursWorked, double HourlyWage ){

        this.EmployeeNumber = EmployeeNumber;
        this.EmployeeName = EmployeeName;
        this.LastName = LastName;
        this.HoursWorked = HoursWorked;
        this.HourlyWage = HourlyWage;
    }
}

Answer 1

不要关闭while循环体中的输出。另外，请遵循Java变量命名约定。不要显示“lol”，试着输出你正在写的信息。如果无法初始化Employee，则很难看到现有方法如何获取读取的值。最后，你需要close()你的PrintWriter（或者使用下面的^{}来为你做这件事）。差不多

List<Employee> al = new ArrayList<>();
try (PrintWriter txtOut = new PrintWriter("payrollError.txt")) {
    Scanner txtIn = new Scanner(new File("payroll.txt"));
    while (txtIn.hasNext()) {
        long employeeNumber;
        String employeeName;
        String lastName;
        double hoursWorked;
        double hourlyWage;

        try {
            employeeNumber = txtIn.nextLong();
            employeeName = txtIn.next();
            lastName = txtIn.next();
            hoursWorked = txtIn.nextDouble();
            hourlyWage = txtIn.nextDouble();
            if (hourlyWage > 10.35) {
                throw new InputMismatchException();
            } else {
                al.add(new Employee(employeeNumber, employeeName,
                                lastName, hoursWorked, hourlyWage));
            }
        } catch (InputMismatchException n) {
            String msg = employeeNumber + " " + employeeName + " "
                    + lastName + " " + hoursWorked + " " + hourlyWage;
            txtOut.println(msg);
            System.out.println(msg);
        }
        // txtOut.close(); // <  this is inside the loop.
    }
} catch (FileNotFoundException e) {
    System.out.println("File payroll.txt was not found.");
}

您的字段不能在Employee类中static！（为了遵循Java命名约定，我将它们改为小写；否则它们看起来像类名）

 private /* static */ long EmployeeNumber;
 private /* static */ String EmployeeName;
 private /* static */ String LastName;
 private /* static */ double HoursWorked;
 private /* static */ double HourlyWage;

使字段private是封装的一个例子

Answer 2

在使用文件流时，最好使用缓冲读写器

使用以下内容修改代码：

public class Main {
    public static void main(String[] args) {
        ArrayList<Employee> ArrEmployee = new ArrayList<Employee>();
        FileReader bfr = null;
        try {
            bfr = new FileReader(new File("payroll.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        BufferedReader br = new BufferedReader(bfr);
        String EmployeeName = "no data";
        FileWriter bfw = null;
        try {
            bfw = new FileWriter("payroolError.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }
        BufferedWriter txtOut = new BufferedWriter(bfw);

    try {
        while (br.read() != -1) {
            String temp = br.readLine();
            Pattern p = Pattern.compile(" ");
            String[] items = p.split(temp);
            try {
                int EmployeeNumber = Integer.parseInt(items[0]);
                EmployeeName = items[1];
                String LastName = items[2];
                double HoursWorked = Double.parseDouble(items[3]);
                double HourlyWage = Double.parseDouble(items[4]);
                if (HourlyWage > 10.35) {
                    throw new InputMismatchException();
                } else {
                    ArrEmployee
                            .add(new Employee(EmployeeNumber, EmployeeName,
                                    LastName, HoursWorked, HourlyWage));
                }
            } catch (NumberFormatException n) {
                txtOut.write(EmployeeName);
            } catch (InputMismatchException n) {
                txtOut.write(EmployeeName);
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

}}