-------------------- DigitExtractor.Java --------------------
/**
 * @(#)DigitExtractor.java
 *
 * DigitExtractor application
 *
 * @author Tim Hill
 * @version 1.00 2010/5/8
 */

 import java.util.*;

public class DigitExtractor {

    public static void main(String[] args) {

        //Initialize variables
        Scanner input = new Scanner(System.in);
        String choice = "";
        Num num = new Num();

        //Ask for integer -> store in object
        System.out.print("Please enter an integer: ");
        try{
            num.nummer = input.nextInt();
        }
        catch(Exception exc){
            System.out.println("Please put in an integer! (number from -inf to inf no decimals and no letters)");
        }

        //Start program look
        while(choice.compareToIgnoreCase("q") != 0){

        //Print interface -> get choice
        System.out.print(
            "Show (W)hole number.\n" +
            "Show (O)nes place number.\n" +
            "Show (T)ens place number.\n" +
            "Show (H)undreds place number.\n" +
            "(Q)uit.\n" +
            "Enter your choice: "
            );

            choice = input.next();

            num.Decision(choice);
        }
    }
}

-------------------- Num.java ---------------------

import java.util.*;

class Num {
    int nummer;
    String sNummer;
    int snLength;

    public Num(){
        nummer = 0;
        sNummer = "";
    }

    public void Decision(String choice){

        //Store nummer into string -> get string length -> store into int
        sNummer = Integer.toString(nummer);
        snLength = sNummer.length();

        //Handle Whole Number
        if(choice.compareToIgnoreCase("w") == 0){
            System.out.println("The whole integer is: " + nummer);
        }

        //Handle Ones Place
        if(choice.compareToIgnoreCase("o") == 0){
            System.out.println("The ones place digit is: " + sNummer.substring(snLength - 1, snLength));
        }

        //Handle Tens Place
        if(choice.compareToIgnoreCase("t") == 0){
            if(snLength >= 2){
                System.out.println("The tens place digit is: " + sNummer.substring(snLength - 2, snLength));
            }

            else{
                System.out.println("You can't have a \"Tens\" place digit with the number being less than 10!");
            }
        }

        //Handle Hundreds Place
        if(choice.compareToIgnoreCase("h") == 0){
            if(snLength >= 3){
                System.out.println("The hunderds digit is: " + sNummer.substring(snLength - 3, snLength));
            }

            else{
                System.out.println("You can't have a \"Hunderds\" place digit with the number being less than 100!");
            }
        }
    }
}