http://www.reddit.com/r/dailyprogrammer/comments/pih8x/easy_challenge_1/

EasyChallengeOne.java

/* To use Scanner class */
import java.util.Scanner;

/* To write to file */
import java.io.*;

public class EasyChallengeOne
{
	private String name;
	private String age;
	private String username;
	private static final String logFileName = "log.txt";

	public EasyChallengeOne()
	{
		name = new String();
		age = new String();
		username = new String();
	}

	public void getUserDetails()
	{
		Scanner input = new Scanner( System.in );

		/* Ask for the user's name */
		System.out.println( "What's your name?" );

		/* Get the response */
		name = input.next();

		/* Ask for the user's age */
		System.out.println( "What's your age?" );

		/* Get the response */
		age = input.next();

		/* Ask for the user's username */
		System.out.println( "What's your username?" );

		/* Get the response */
		username = input.next();
	}

	public String toString()
	{
		return "Your name is " + name + ", you are " + age + ", and your username is " + username + ".";	
	}

	public void logUserDetails() throws IOException
	{
		File file = new File( logFileName );
		boolean fileCreated = file.createNewFile();

		if( !fileCreated ) {
			System.err.println( "Error: log file already exists." );
			return;
		}

		FileWriter fstream = new FileWriter( logFileName );
		BufferedWriter out = new BufferedWriter( fstream );
		out.write( this.toString() );
		out.close();
	}

	public static void main( String[] args ) throws IOException
	{
		EasyChallengeOne easy = new EasyChallengeOne();
		easy.getUserDetails();

		System.out.println( easy.toString() );
		easy.logUserDetails();
	}
}