Question

我正在尝试从文件导入数据并从中创建对象，然后将其存储到数组中。我是初学者，我不确定我做错了什么。

我收到了6个错误：

。\ Employees.java:92：错误：预期的类，接口或枚举 } ^
Employeetest.java:24：错误：找不到符号 objectArray [counter] = setFirstName（firstNameEmployee）;
symbol：方法setFirstName（String）位置：类Employeetest Employeetest.java:26：错误：找不到符号 objectArray [counter] = setLastName（lastNameEmployee）;
symbol：方法setLastName（String）位置：类Employeetest Employeetest.java:28：错误：找不到符号 objectArray [counter] = setAge（ageEmployee）;
symbol：方法setAge（double）位置：类Employeetest Employeetest.java:30：错误：找不到符号 objectArray [counter] = setHourlySalary（hourlySalaryEmployee）;
symbol：方法setHourlySalary（double）位置：类Employeetest Employeetest.java:32：错误：找不到符号 objectArray [counter] = setWeeklyHoursWorked（weeklyhoursworkedEmployee）;

symbol：方法setWeeklyHoursWorked（double）位置：类Employeetest 6个错误

这就是我所拥有的。

    This is my objects class 
    public class Employees {

    private String firstName;
    private String lastName;    
    private double age;
    private double hourlySalary;
    private double weeklyhoursworked;
    private double weeklysalary;

    public void setFirstName(String EmployeeFirstName) {
        firstName = EmployeeFirstName;
        return;
    } 
    public void setLastName(String EmployeeLastName){
        lastName = EmployeeLastName;
        return;
   }
   public void setAge(double EmployeeAge){
        age = EmployeeAge;
        return;
   }
    public void setHourlySalary(double EmployeeHourlySalay){
        hourlySalary = EmployeeHourlySalay;
        calculateWeeklySalary(weeklyhoursworked);
        return;
    }
    public void setWeeklyHoursWorked(double EmployeeWeeklyHoursWorked){
        weeklyhoursworked = EmployeeWeeklyHoursWorked;
        return;
    }
    public String getFirstName(){
        return firstName;
    }
    public String getLastName(){
        return lastName;
    }
    public double getAge(){
        return age;
    }
    public double getHourlySalary(){
        return hourlySalary;
    }
    public double getWeeklyHourlyWorked(){
        return weeklyhoursworked;
   }
    public double getWeeklySalary(){
        return weeklysalary;
    }
    public void calculateWeeklySalary(double hoursWorked) {
    weeklysalary = (hoursWorked * hourlySalary);
    return;
    }
    }

这是我的主要程序，我尝试导入数据，将其转换为对象，然后将其存储为数组。

import java.io.*;

public class Employeetest
{


public static void main(String[] args) throws Exception
{

String firstNameEmployee = "null";
String lastNameEmployee = "null";   
double ageEmployee;
double hourlySalaryEmployee;
double weeklyhoursworkedEmployee;
double weeklySalaryEarnedEmployee;
int counter = 0;

Employees objectArray[] = new Employees[counter + 1]; 
FileReader fr = new FileReader("Employeedata.txt");
BufferedReader br = new BufferedReader(fr);

counter = 0;
while ((firstNameEmployee = br.readLine()) != null) {
    objectArray[counter] = setFirstName(firstNameEmployee);
    lastNameEmployee = br.readLine();
    objectArray[counter] = setLastName(lastNameEmployee);
    ageEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setAge(ageEmployee);
    hourlySalaryEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setHourlySalary(hourlySalaryEmployee);
    weeklyhoursworkedEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setWeeklyHoursWorked(weeklyhoursworkedEmployee);
    System.out.println(objectArray[counter]);
counter++;
}
    br.close();     
    System.exit(0);
}
}

无法识别的错误，有什么值得注意的吗？

Answer 1

问题

您正在调用在不先访问对象的情况下无法访问的方法..

继续前进：

while ((firstNameEmployee = br.readLine()) != null) {
    objectArray[counter] = setFirstName(firstNameEmployee);
    lastNameEmployee = br.readLine();
    objectArray[counter] = setLastName(lastNameEmployee);
    ageEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setAge(ageEmployee);
    hourlySalaryEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setHourlySalary(hourlySalaryEmployee);
    weeklyhoursworkedEmployee = Double.parseDouble(br.readLine());
    objectArray[counter] = setWeeklyHoursWorked(weeklyhoursworkedEmployee);
    System.out.println(objectArray[counter]);
counter++;
}

我们将看看这个代码块。首先，从文件中读取值并将其分配给变量。然后，您将其分配给对象...问题变得明显的地方

这就是你拥有的

objectArray[counter] = setLastName(lastNameEmployee);

要修复，只需将具有上述方法的所有行更改为此

objectArray[counter].setLastName(lastNameEmployee);

另一个例子

而不是

 objectArray[counter] = setAge(ageEmployee);

做

 objectArray[counter].setAge(ageEmployee);

修复空指针异常

for(int x =0; x< objectArray.length;x++)
{
    objectArray[x] = new Employees();
}

将该循环置于

之下

BufferedReader br = new BufferedReader(fr);

原因是因为对象数组中的对象最初是null。因此，在你可以改变它们的实例变量之前，你需要实例化它们。

读取文件，并根据读取的数据

1 个答案: