Creating a Scanner for an input file requires several lines of code when all you want is to simply provide a file name and get a Scanner.

Here is a class with methods that handle all the details and do want you want.

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Scanner;


public class MyIO {
  public static Scanner openInput(String fname)
  {
    Scanner infile = null;
    try {
      infile = new Scanner(new File(fname));
    } catch(FileNotFoundException e) {
      System.out.printf("Cannot open file '%s' for input\n", fname);
      System.exit(0);
    }
    return infile;
  }
        
  public static PrintWriter openOutput(String fname)
  {
    PrintWriter pw = null;
    try {
      pw = new PrintWriter(fname);
    } catch(FileNotFoundException e) {
      System.out.printf("Cannot open file/create file '%s' for output\n", fname);
      System.exit(0);
    }
    return pw;
  }
        
  public static PrintWriter openOutput(PrintStream ps)
  {
    PrintWriter pw;
                
    pw = new PrintWriter(ps);
    return pw;
  }
}