Java – pass the file as a command line parameter and read its line

This is the code I found on the Internet to read the file line. I also use eclipse and set the file name as SANSHIN. In its parameter field Txt transfer But it prints:

Error: textfile.txt (The system cannot find the file specified)

Code:

public class Zip {
    public static void main(String[] args){
        try{
            // Open the file that is the first 
            // command line parameter
            FileInputStream fstream = new FileInputStream("textfile.txt");
            BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
            String strLine;
            //Read File Line By Line
            while ((strLine = br.readLine()) != null)   {
              // Print the content on the console
              System.out.println (strLine);
            }
            //Close the input stream
            in.close();
            }catch (Exception e){//Catch exception if any
              System.err.println("Error: " + e.getMessage());
            }


    }
}

Please help me explain why this error occurred thank you

Solution

...

...
// command line parameter
if(argv.length != 1) {
  System.err.println("Invalid command line,exactly one argument required");
  System.exit(1);
}

try {
  FileInputStream fstream = new FileInputStream(argv[0]);
} catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
}

// Get the object of DataInputStream
...

> java -cp ... Zip \path\to\test.file