Thread: StringIndexOutOfBoundsException

Ok so basically this code finds all the numbers in a string then prints out how many digits they have...
The code works fine but if the string has a number at the end it prints out "StringIndexOutOfBoundsException" and as u see I threw that exception in the class but with no use... I don't understand why it gives me that message every time there is a number at the end of the string...


//Number Finder

import java.io.*;
public class pas4{
	public static void main (String args []) throws IOException, StringIndexOutOfBoundsException{
		InputStreamReader instream = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(instream);
		System.out.println("Please insert a passage");
		String psg = br.readLine();
		int i = 0;
		String tmp = "";
		while (i < psg.length()){
			while (((psg.charAt(i)) >= 48) && ((psg.charAt(i)) <= 57) && (i < psg.length())){
				tmp = tmp + psg.charAt(i);
				i = i + 1;
			}
			if (tmp.equals("")){
				i = i + 1;
			}else{
				int z = Integer.parseInt(tmp);
				int digits = 0;
				while (z != 0){
					z = z / 10;
					digits = digits + 1;
				}
				System.out.print(tmp + " has ");
				System.out.println(digits + " digits ");
				tmp = "";
				i = i + 1;
			}
		}		
	}
}

Example input: I'll live till 42
Output: Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 17
at java.lang.String.charAt(String.java:686)
at pas4.main(pas4.java:34)