New to Java

Hey guys, this is my assignment:

Ask the user for a single letter and a sentence, and print out the
number of times that letter shows up in the sentence.

Please tell me how to scan for a character. I tried this:

import java.util.Scanner;

public class Frequencies
{
    public static final void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter a sentence");
        String x = scanner.next();
        System.out.println("Enter a letter to look for");
        String y = scan.next();
        char z = y.charAt(0);
        int chara = 0;
        for(int i = 0; i<x.length(); i++){
                if(z==y.charAt(i)){
                        chara = chara++;
                }
        }
        System.out.println("There are " + chara + " " + z + "s in the sentence");
    }
}

and got the error after Running (not compiling):

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1
        at java.lang.String.charAt(String.java:687)
        at Frequencies.main(Frequencies.java:16)

I thought this meant that I was asking for the character in postition 1 of string y, but in my code I wrote position 0

when I tried inserting words in the character place (just to see what happened, not expecting functionallity, I got

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: [NUMBER OF CHARACTERS]
        at java.lang.String.charAt(String.java:687)
        at Frequencies.main(Frequencies.java:16)

Please help.
The assignment isn't due nor graded, this is just killing me lol.

Thanks in advance

Edited by: Sevan on Oct 18, 2008 4:40 PM