对解析方法感到困惑

Question

我正在尝试编写一个类来解析文本文件，根据员工加入的年份将信息存储在数组中，并根据每一行创建一个员工、推销员或执行对象。我的教授给了我们这条线来解析年份

while ((line = br.readLine()) != null)
    {
        int year = Integer.parseInt(line.substring(0,4));
        Employee e = getEmployee(line);
    }

这个方法解析文档的其余部分

 public static Employee getEmployee(String line)
{
    Employee e= new Employee()
    String[] splitWithComma = line.split(",");
    String first = splitWithComma[0];
    String[] firstSplit = first.split(" ");
    String second = splitWithComma[1];
    String[] secondSplit = second.split(" ");
    String third = splitWithComma[2];
    String[] thirdSplit = third.split(" ");
    String fourth = splitWithComma[3];
    String[] fourthSplit = fourth.split(" ");
    String fifth=splitWithComma[4];
    String[] fifthSplit = fifth.split(" ");


} 

我很困惑我应该如何在 getEmployee 类中初始化 Employee 对象，以及是否需要在 while 方法中解析我的任何双打，以及如何做到这一点

这是我的文本文件

2014, Employee, John Baker, 15000
2014, Salesman, Amanda Stein, 30000, 1100000
2014, Executive, Jessica Kettner, 53
2015, Employee,Zach Edwards, 20000
2015, Salesman,Shelby Douglas, 45000, 2345
2015, Executive, Corey Matthews, 67000, 48

我的员工班级

import java.util.*;

public class Employee 
{
private String name;
private double monthlySalary;

public Employee(String name, double monthlySalary)
{
    this.name=name;
    this.monthlySalary=monthlySalary;
}



public String getName() {
    return name;
}



public void setName(String name) {
    this.name = name;
}



public double getMonthlySalary() {
    return monthlySalary;
}



public void setMonthlySalary(int MonthlySalary)
{

}



public double annualSalary()
{
    return monthlySalary*12;
}







public String toString()
{
    String str;
    str="Name: "+name;
    str+="\nMonthly Salary: "+monthlySalary;
    return str;
}
}

还有我的司机

import java.io.*;
import java.util.*;
public class employeeDriver
{
public static void main(String[] args)
{
    String line;
    String input;
    Scanner readInput=null;
    Scanner readFile = null;
    BufferedReader br=null;

    try
    {
         br = new BufferedReader(new FileReader("tester.txt"));
    }
    catch(FileNotFoundException e)
    {
        System.out.println("The file can't be opened");
        System.exit(0);
    }


try
{   
    while ((line = br.readLine()) != null)
    {
        int year = Integer.parseInt(line.substring(0,4));
        Employee e = getEmployee(line);
    }

}

catch (IOException ioe)
{
    System.out.println("Can't read file");
}
finally
{
    System.exit(0);
}

}


public static Employee getEmployee(String line)
{
    Employee e= new Employee()
    String[] splitWithComma = line.split(",");
    String first = splitWithComma[0];
    String[] firstSplit = first.split(" ");
    String second = splitWithComma[1];
    String[] secondSplit = second.split(" ");
    String third = splitWithComma[2];
    String[] thirdSplit = third.split(" ");
    String fourth = splitWithComma[3];
    String[] fourthSplit = fourth.split(" ");
    String fifth=splitWithComma[4];
    String[] fifthSplit = fifth.split(" ");


} 
}

Answer 1

为了回答您的第一个问题，Employee 构造函数将 String 和 double 作为输入，因此当您创建新的 Employee 对象时，您必须（除非您创建另一个构造函数）提供这些值，如下所示：

Employee e = new Employee("John Baker", 15000);

对于解析位，看起来 getEmployee 方法应该处理那个，所以你在你的 while 循环中放的就是这个

Employee e = getEmployee(line);

getEmployee 方法是不完整的。由于您在创建 Employee 对象时已经需要姓名和薪水，因此您应该先进行解析，然后再创建对象。

关于解析双打，有一个 Double.parseDouble(String) 方法，但似乎在您的文本文件中，薪水无论如何都被格式化为整数，如果您尝试执行类似的操作

int salary = Integer.parseInt(salaryStr);
Employee e = new Employee("John Baker", salary);

那么 Java 应该自动将整数转换为双精度数。薪水应该是类本身的 double 还是 int 是另一回事。