问题描述
我正在创建一个小程序,该程序将读取一个文本文件,该文件包含许多随机生成的数字,并产生诸如均值,中位数和众数之类的统计信息.我已经创建了文本文件,并确保在声明为新文件时名称完全相同.
I'm creating a small program that will read a text file, which contains a lot of randomly generated numbers, and produce statistics such as mean, median, and mode. I have created the text file and made sure the name is exactly the same when declared as a new file.
是的,该文件与类文件位于同一文件夹中.
Yes, the file is in the same folder as the class files.
public class GradeStats {
public static void main(String[] args){
ListCreator lc = new ListCreator(); //create ListCreator object
lc.getGrades(); //start the grade listing process
try{
File gradeList = new File("C:/Users/Casi/IdeaProjects/GradeStats/GradeList");
FileReader fr = new FileReader(gradeList);
BufferedReader bf = new BufferedReader(fr);
String line;
while ((line = bf.readLine()) != null){
System.out.println(line);
}
bf.close();
}catch(Exception ex){
ex.printStackTrace();
}
}
}
错误行的内容如下:
java.io.FileNotFoundException: GradeList.txt (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileReader.<init>(FileReader.java:72)
at ListCreator.getGrades(ListCreator.java:17)
at GradeStats.main(GradeStats.java:11)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
推荐答案
如何添加:
String curDir = System.getProperty("user.dir");
打印出来.它会告诉您当前的工作目录是什么.然后,您应该能够看到为什么找不到文件.
Print this out. It will tell you what the current working directory is. Then you should be able to see why it isn't finding the file.
您可以检查是否允许自己执行某些操作(如果找不到该文件),而不是抛出代码:
Rather than allowing your code to throw, you could check to allow yourself to do something if the file isn't found:
File GradeList = new File("GradeList.txt");
if(!GradeList.exists()) {
System.out.println("Failed to find file");
//do something
}
请运行以下内容并粘贴输出:
Please run the below and paste the output:
String curDir = System.getProperty("user.dir");
File GradeList = new File("GradeList.txt");
System.out.println("Current sys dir: " + curDir);
System.out.println("Current abs dir: " + GradeList.getAbsolutePath());
这篇关于即使文件存在并且拼写正确,也获取FileNotFoundException的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!