Java Help Please

[Garee]

I am working on one of my university Java course assessments and I keep experiencing this error.

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.next(Unknown Source)
	at Person.<init>(Person.java:49)
	at ProcessMembers.main(ProcessMembers.java:22)

This occurs in my Person class constructor.

	public Person( Scanner inputScanner )
	{
		this.lastName = inputScanner.next();
		this.firstName = inputScanner.next(",");
		this.male = Gender( inputScanner.next(",") );
		this.dateOfBirth = new Date( inputScanner.nextInt(), inputScanner.nextInt(), inputScanner.nextInt() ); 
	}

The Scanner in this case is reading from a text file containing details of some people in the format:

Adams Bill, M, 16 03 63

The problem seems to be the delimiter "," as the code compiles correctly when I only use .next()


Any help is much appreciated, thanks.

 

[JHeaton]

Someone correct me if I'm wrong, but wouldn't you need to change delimiter by using inputScanner.useDelimiter(", ");? Obviously, you'd then have to change it back once you were done using that specific delimiter.

 

[Garee]

Someone correct me if I'm wrong, but wouldn't you need to change delimiter by using inputScanner.useDelimiter(", ");? Obviously, you'd then have to change it back once you were done using that specific delimiter.

I think you may be right. I mis-read the API and thought it was similiar to the way .split(",") is used.

 

[JHeaton]

I think you may be right. I mis-read the API and thought it was similiar to the way .split(",") is used.

Yeah. I mean, I don't remember anything anywhere saying that there was another way to specify delimiter when using the API, but I could be wrong about it. Let us know how it turns out.

 

[slylittlefox]

http://download.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html

Not meaning that in an arsey way, but Java's Javadocs are the best place to learn. A habit of mine is to take the 30 secs to read the Javadoc segment for any method/class I'm using instead of just relying on auto-complete to search through the methods of a class and effectively brute force them I've learnt a great deal of stuff about Java/JVM just from doing that.

'Pro-tip': if you're using Netbeans (and probably Eclipse?), just right-click on the method you're using/trying to use and click navigate to source - that way you get the benefit of the Javadoc and also get to see how Sun have actually gone about implementing it - again, great for learning new stuff. Funny to see some 'familiar faces' like Josh Bloch in amongst the code too.

Back to the point: as has been said (and you were correctly guessing at anyway), you're using hasNext() in the wrong way.