Example Using Lists

import java.util.*;

public class TakeAGuess {
    final static int NUM_DIGITS = 5;

    public static void main(String[] args) {

        // Sanity check on the given data.
        if (args.length != NUM_DIGITS) {
            System.err.println("Guess " + NUM_DIGITS + " digits.");
            return;
        }
        /* Initialize the solution list. This program has a fixed solution. */
        List secretSolution = new ArrayList();                      // (1)
        secretSolution.add("5");
        secretSolution.add("3");
        secretSolution.add("2");
        secretSolution.add("7");
        secretSolution.add("2");

        // Convert the user's guess from string array to list.         (2)
        List guess = new ArrayList();
        for (int i=0; i

Running the program with the following arguments:
java TakeAGuess 3 2 2 2 7


gives the following output:
4 digit(s) correctly included.
1 digit(s) correctly placed.