java - 无法在 Java 中打开文本文件

Question

我正在使用BlueJ，仅供引用。

程序编译并运行良好。

问题是我应该打开一个文本文件(并向其中添加内容)，但我遇到了异常，它说我无法打开该文件。

该程序应该读取并打开“EmployeeData.txt”:

S       Washington,George       000001      125000
H   MacDonald,Ronald        386218     7.80 true  40
H       Walton,Samuel           268517  8.21    false
H   Thomas,David            131313  9.45    true    38
H   Sanders,HarlandDavid    277651  8.72    false
S   Baron,James         368535  310236

这是我当前获得的输出的片段:

Cannot open EmployeeData.txt.
1) Add a salaried worker
S Moran,Blake 123456 260000.0
2) Add an hourly worker who has no overtime allowed
S Moran,Blake 123456 260000.0
H Bob,Billy 654321 15.0 false
3) Add an hourly worker who has overtime allowed
S Moran,Blake 123456 260000.0
H Bob,Billy 654321 15.0 false
H Smith,Will 345612 10.5 true 30
4) Add a worker that is already in the database
java.lang.RuntimeException: The Employee Is Not New

我正在尝试读取并打开我的主类中的文本文件，WorkerApp:

public class WorkerApp{
/**
* Reads the infile, runs tests, and prints the output.
*/
public static void  main (String args[]){
    Company company = new Company();
    try{
        Scanner reader = new Scanner (new File("EmployeeData.txt"));
        while(reader.hasNext()){
            String line = reader.nextLine();
            String Employee[] = line.split(" ");
            String sorh = Employee[0];
            String name = Employee[1];
            String id = Employee[2];
            double salary = Double.parseDouble(Employee[3]);
            Employee e;
            if (Employee[0].equals("S")){
                e = new SalariedWorker(sorh, name, id, salary);}
            else {
                boolean overtime = Boolean.parseBoolean(Employee[4]);
                if(overtime){
                    int maxHours = Integer.parseInt(Employee[5]);
                     e = new HourlyWorker(sorh, name, id, salary, maxHours);
                }
                else{
                    e = new HourlyWorker(sorh, name, id, salary);
                }
            }
            company.add(e);
        }
    }catch (Exception err){
        System.out.println("Cannot open EmployeeData.txt.");
    }

    //Test Number 1
    System.out.println("1) Add a salaried worker");
    SalariedWorker SWorker1 = new SalariedWorker("S", "Moran,Blake", "123456", 260000);
    company.add(SWorker1);
    company.print();

    //Test Number 2
    System.out.println("2) Add an hourly worker who has no overtime allowed");
    HourlyWorker HWorker1 = new HourlyWorker("H", "Bob,Billy", "654321", 15);
    company.add(HWorker1);
    company.print();

    //Test Number 3
    System.out.println("3) Add an hourly worker who has overtime allowed");
    HourlyWorker HWorker2 = new HourlyWorker("H", "Smith,Will", "345612", 10.5, 30);
    company.add(HWorker2);
    company.print();

    //Test Number 4
    System.out.println("4) Add a worker that is already in the database");
    try{
        company.add(SWorker1);
    }catch(Exception err){
        System.out.println(err);
        System.out.println();
    }   

    //Test Number 5
    System.out.println("5) Print the sorted list");
    company.print();

    //Test Number 6
    System.out.println("6) Remove a worker who is NOT in the list");
    company.remove("Brooks,Phil");
    System.out.println();

    //Test Number 7
    System.out.println("7) Remove a worker who is the first in the list ");
    company.remove("Moran,Blake");
    company.print();
    System.out.println();

    //Test Number 8
    System.out.println("8) Find a worker who is the middle of the list");
    int index = company.find("Bob,Billy");
    System.out.println("Found at "+ index);
    System.out.println();

    //Test Number 9
    System.out.println("9) Find a worker who is NOT in the list");
    index = company.find("Harrison,Ford");
    System.out.println("Found at "+ index);
    System.out.println();

    //Test Number 10
    System.out.println("10) Find the weekly salary of a worker who is salaried");
    System.out.println(SWorker1.FindSalary());
    System.out.println();

    //Test Number 11
    System.out.println("11) Find the weekly salary of an hourly worker who has no overtime allowed [50 hours]");
    System.out.println(HWorker1.FindSalary(50));
    System.out.println();

    //Test Number 12
    System.out.println("12) Find the weekly salary of an hourly worker who has overtime allowed [50 hours]");
    System.out.println(HWorker2.FindSalary(50));
    System.out.println();

    //Test Number 13
    System.out.println("13) Find the weekly salary of an hourly worker who has overtime allowed [20 hours]");
    System.out.println(HWorker2.FindSalary(20));
    System.out.println();

    //Test Number 14
    System.out.println("14) Print the sorted list");
    company.print();

    //Test Number 15
    System.out.println("\n15) End the process");
} 
}

这是我的 Company 类(如果有帮助的话):

public class Company{
private Employee[] employeeArray;
private final int InitialCapacity = 7;
private int employCount;

/**
* Creates the employee array and sets employCount to 0.
*/
public Company(){
    employeeArray = new Employee[InitialCapacity];
    employCount = 0;
}

/**
* Finds an employee in the list.
*/
public int find(String name){
    for (int i = 0; i < employCount; i++){
        if (employeeArray[i].getName().equals(name)){
            return i;
        }
    }

    return -1;
}

/**
* Adds an employee to the list.
*/
public int add(Employee employ){
    int index;
    for (index = 0; index < employCount; index++){
        int result = employeeArray[index].getName().compareTo(employ.getName());
        if(result == 0){
            throw new RuntimeException ("The Employee Is Not New");
        }
    }

    if (employeeArray.length == employCount){
        expand();
    }

    employeeArray[index] = employ;
    employCount++;
    return index;
}

/**
* Removes an employee to the list.
*/
public void remove(String name){
    int index = find(name);
    if (index == -1){
        System.out.println("The Employee is not Found");
        return;
    }

    for (int i = index; i < employCount - 1; i++){
        employeeArray[i] = employeeArray[i + 1];
    }

    employCount--;
}

/**
* Prints the list.
*/
public void print(){
    if(employCount == 0){
        System.out.println("The List is Empty");
        return;
    }

    for(int i = 0; i < employCount; i++){
        System.out.println(employeeArray[i]);
    }
}

/**
* Expands the list.
*/
private void expand(){
    Employee[] newArray = new Employee[employeeArray.length + InitialCapacity];
    for (int i = 0; i < employeeArray.length; i++){
        newArray[i] = employeeArray[i];
    }

    employeeArray = newArray;
}
}

应该注意的是，还有其他三个类，Employee、HourlyWorker 和 SalariedWorker。梯子两个是 Employee 的子类，但它们对于读取文本文件并不重要，因此我将它们从本文中排除。

希望我能得到一些帮助。

提前谢谢您!

Answer 1

这样写真的很危险

catch (Exception err){
    System.out.println("Cannot open EmployeeData.txt.");
}

或类似的东西，因为这意味着您丢弃了有关导致错误的原因的所有信息。至少，您应该打印出错误的堆栈跟踪，以便您可以调查发生了什么。

尝试添加

err.printStackTrace();

在catch block 内并读取它打印的内容。这应该可以告诉您出了什么问题。