I am creating a program in Java that Scans a text file and one of the requiremen

Question

I am creating a program in Java that Scans a text file and one of the requirements of this program is to allow the user to input an output file name using PrintStream. I don't know how/where to add the PrintStream class so that it allows the user to choose a file name.

Here is what I have so far:

import java.util.*;
import java.io.*;

public class HealthFile {

/**
* @param args
*/
public static void main(String[] args) {

// Creates the Scanner
Scanner s = new Scanner(System.in);
String filename ="test.txt";

try
{
s = new Scanner(new FileReader(filename));
}
catch (Exception e)
{
System.out.printf("ERROR: File NOT found");

// Can end the program or do something else here…

}

System.out.printf("%-20s%15s ", "Last Name ", "Date of Birth");


while (s.hasNext()) {


String firstname;
firstname = s.next();


String lastname;
lastname = s.next();


int id;
id = s.nextInt();


String dateofbirth;
dateofbirth= s.next();


System.out.printf("%-20s%15s ", lastname, dateofbirth);
}
s.close();

Explanation / Answer

PrintStream itself cannot handle any input, however, it can take in a String containing a filename that CAN be printed. For example, you can add the following to your code: System.out.print("Please enter a file to write to: "); try{ BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in)); String fileName = bufferRead.readLine(); PrintStream printStream = new PrintStream(fileName); } catch(IOException e) { System.out.println("Error: "+e.getMessage()); } BufferedReader takes the file from the user and passes it into PrintStream, so if a user passes in "test.txt", a file called test.txt will be created in the same directory as the class file for you to use.

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