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

public class Main
{
	public static void main(String[] args) throws FileNotFoundException
	{
		Scanner in = new Scanner(System.in);
		System.out.print("Input the file pathname: ");
		String fname = in.next();

		Scanner inFile = new Scanner(new File(fname));
		int x = inFile.nextInt();
		System.out.println("Data is: "+x);
		inFile.close();

		in.close();
	}
}

/* Rundown [in case the file exists and data is read successfully]
Input the file pathname: data001.txt
Data is: 678
 */

/* Rundown [in case the file doesn't exist, the printStackTrace method of FileNotFoundException is invoked and show the following output]
Input the file pathname: data02.txt
Exception in thread "main" java.io.FileNotFoundException: data02.txt (The system cannot find the file specified)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(Unknown Source)
	at java.util.Scanner.<init>(Unknown Source)
	at Main.main(Main.java:13)

 */

/* Rundown [in case the beginning of the file is not a number, the printStackTrace method of InputMismatchException is invoked and show the following output]
Input the file pathname: data002.txt
Exception in thread "main" java.util.InputMismatchException
	at java.util.Scanner.throwFor(Unknown Source)
	at java.util.Scanner.next(Unknown Source)
	at java.util.Scanner.nextInt(Unknown Source)
	at java.util.Scanner.nextInt(Unknown Source)
	at Main.main(Main.java:14)
 */