Computer Science 225
Advanced Programming
Spring 2017, Siena College
CatchExampleWithResources BlueJ Project
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CatchExampleWithResources Source Code
The Java source code for CatchExampleWithResources is below. Click on a file name to download it.
import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.util.NoSuchElementException; import java.util.Scanner; /* * Example CatchExample: an example demonstrating catch blocks, similar * to code in Horstmann's Big Java, this one with a try with * resources instead. * * Jim Teresco, Siena College, Computer Science 225, Spring 2017 * * $Id: templateapp.java 2975 2016-08-30 02:35:29Z terescoj $ */ public class CatchExampleWithResources { public static void main(String[] args) { // let's try to open a file and read in a string then convert it to an int, // stored in this variable int value = 0; try(Scanner s = new Scanner(new File(args[0]))) { // this line might generate a NoSuchElementException String word = s.next(); // this line might generate a NumberFormatException value = Integer.parseInt(word); } catch (FileNotFoundException e) { // if our file is not found, we'll call this exception handler, // with the appropriate message as encapsulated in the exception System.err.println(e.getMessage()); System.err.println("Please try again, but with a file that exists next time."); System.exit(1); } catch (IOException e) { System.err.println(e.getMessage()); System.err.println("Your file existed, but some other IOException happened..."); System.exit(1); } catch (NoSuchElementException e) { System.err.println("I expected your file to have something in it..."); System.exit(1); } catch (NumberFormatException e) { System.err.println("I expected your file to have an int in it..."); System.exit(1); } System.out.println("I found the number " + value + " in your file."); } }