为什么在此程序中出现java.io.FileNotFoundException？

Question

Why am I getting java.io.FileNotFoundException in the following program?

import java.io.*;

class FisDemo {

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

        FileInputStream fis=new FileInputStream("abc.txt");
/* Here we are accessing file abc.txt statically. i.e abc.txt must exist in current class directory */

        int  data;

        while(( data=fis.read())!=-1){
            System.out.println((char)data);
      // here we are casting, because return type of read() is int
        }
    }
}

Answer 1

FileInputStream fis=new FileInputStream("abc.txt");

Most likely you have bad file path .
So first you need to check where your file is located and then add right path.

Have also look at: How to construct a file path in Java or Construct file path .

Answer 2

The program cannot find the abc.txt file. Maybe it is not present in your output / bin folder. It depends on your IDE if the file can be in src folder / resource folder or has to be copied to output folder after building the application.

Answer 3

The reason is abc.txt is not present(in the current directory).

FileInputStream fis=new FileInputStream("abc.txt");

Specify the full name of the file

    String fileFullName="/home/abc.txt";
    FileInputStream fis=new FileInputStream(fileFullName);

And yes is the answer for your second question.

Answer 4

该文件在当前的Java文件目录中不存在。请在该目录中创建然后尝试。