如何在Java程序中读取文本文件

Question

this is my java code. Please tell where i have to change the code so that i could be able to read the data from my text file ie test.txt

import java.io.*;

class ShowFile {
    public static void main(String args[]) throws IOException {
        // this is my file where my data is: test.TXT;
        int i;
        FileInputStream fin;

        try {
            fin = new FileInputStream(args[0]);
        } catch (FileNotFoundException e) {
            System.out.println("File Not Found");
            return;
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("Usage: ShowFile File "+ e);
            return;
        }

        // read characters until EOF is encountered
        do {
            i = fin.read();
            if (i != -1)
                System.out.print((char) i);
        } while(i != -1);

        fin.close();
    }
}

Answer 1

您需要更改此行才能读取文件

       fin = new FileInputStream(yourfile);

Answer 2

You're opening the input stream here:

fin = new FileInputStream(args[0]);

it's using the first argument to main (from the command line) args[0] you can change that to your specific file. Or just pass your file in.

Answer 3

做这个：

fin = new FileInputStream(path to your file);

Answer 4

Try This :

      String s=args[0];
      fin = new FileInputStream(s);

Compile java File:

      javac ShowFile.java

Pass The Command line argument:

      java ShowFile file.txt