Java Scanner：NoSuchElementException

Question

我无法让Scanner工作。它基于我的老师给我们修改的一个例子，但是当我运行它时我一直遇到错误。当我运行它时，我收到此错误：

java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:862)
at java.util.Scanner.next(Scanner.java:1371)
at ReadDataFile.main(ReadDataFile.java:25)

主类：

  /**
 * Write a description of class ReadDataFile here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.ArrayList;
public class ReadDataFile {
    public static void main(String[] args) throws IOException {

        Scanner sInputFile=null;
        String FirstName,LastName;
        Float PayRate, HoursWorked;

        ArrayList<Employee> Records = new ArrayList<Employee>();

        try {
            sInputFile = new Scanner(new BufferedReader(new FileReader("c:\\temp\\inputData.txt")));
            while (sInputFile.hasNextLine()) {
               FirstName = new String(sInputFile.next());
               if(FirstName.length() > 9)
               FirstName = FirstName.substring(0,8);
               LastName = new String(sInputFile.next());
               if(LastName.length() > 9)
               LastName = LastName.substring(0,8);
               PayRate = sInputFile.nextFloat();
               HoursWorked = sInputFile.nextFloat();
               Employee worker = new Employee(LastName,FirstName,PayRate,HoursWorked);
               Records.add(worker);
            } // while   

        } // try
        catch(Exception IOException)
        {
           System.out.println("Unknown file error occurred ...");
        }
        finally { sInputFile.close();}

        System.out.print("Complete");
    } // main
} // class

员工类：

public class Employee
{
  String LastName, FirstName;
  float PayRate, HoursWorked, Net, Gross, Tax, TaxRate;

  public Employee(String LN, String FN, float Rate, float Hours) 
  {
    LastName = LN;
    FirstName = FN;
    PayRate = Rate;
    HoursWorked = Hours;
    Gross = PayRate * HoursWorked;
    Net = Gross * (1-TaxRate);
    Tax = Gross * TaxRate;

  }

  public float getPayRate()
  {
      return PayRate;
    }
    public float getHoursWorked()
  {
      return HoursWorked;
    }
    public float getNet()
  {
      return Net;
    }
    public float getGross()
  {
      return Gross;
    }
    public String getLastName()
  {
      return LastName;
    }
    public String getFirstName()
  {
      return FirstName;
    }
  public float getTax()
  {
      return Tax;
    }
}

以下是我要阅读的文字：

 Doe   John  13.00  44.5
 Doe   John  13.00  44.5
 Doe   John  13.00  44.5
 Doe   John  13.00  44.5

Answer 1

您需要在循环底部调用Scanner.nextLine()，即本例sInputFile.nextLine()。你没有前进到下一行，所以你在这一行上用尽了令牌。

Answer 2

这将有效..

try {
       //input File
        sInputFile = new Scanner(new File("C:/Users/Alex.hp/Desktop/t.txt"));

        while (sInputFile.hasNextLine()) { //your code
           FirstName = new String(sInputFile.next());
           if(FirstName.length() > 9)
           FirstName = FirstName.substring(0,8);
           LastName = new String(sInputFile.next());
           if(LastName.length() > 9)
           LastName = LastName.substring(0,8);
           PayRate =Float.parseFloat(sInputFile.next()); //edited cause of Exception(InputMismatch Error)
           HoursWorked =Float.parseFloat(sInputFile.next()); //edited cause of Exception(InputMismatch Error)
           Employee worker = new Employee(LastName,FirstName,PayRate,HoursWorked);
           Records.add(worker);
        } // while   

    }catch(Exception ex){
        ex.printStackTrace();
    }

//See the results
 for(int i=0; i<Records.size(); i++)
        System.out.println(Records.get(i).FirstName+"    "+Records.get(i).LastName +" " +Records.get(i).PayRate +" "+Records.get(i).HoursWorked);