deepblue

deepblue.java

/**

* A class that models a combination lock.

*/

public class ComboLock

{

    private int[] digits;

    private String newCombo;

    private boolean isLocked;

    private int k = 0;

    /**

    * A combination for this lock is set when constructed.

    * Although only digits are allowed, we take the entire

    * string as argument.

    *

    * The combo lock defaults to LOCK when first created.

    */

    public ComboLock(String newCombo)

    {

        isLocked = true;

        this.newCombo = newCombo;

        digits = new int[4];

    }



    /**

    * Enter one digit at a time (as an integer). So if the combo is

    * "12", calling this method twice with parameters 1 and 2 will cause it

    * to UNLOCK. If the caller made a mistake, the lock will reset and

    * the caller will have to enter all the digits from the beginning.

    */

    public void enterDigit(int d)

    {

        if (d < 10) {

            if (k % 4 == 0) {

                digits[0] = d;

            } else if (k % 4 == 1) {

                digits[1] = d;

            } else if (k % 4 == 2) {

                digits[2] = d;

            } else if (k % 4 == 3) {

                digits[3] = d;

            }

        }

        k++;

    }

    

    public void checkLock() 

    {

        int i = 0, j = 0;

        for (char c : newCombo) {
            if(Character.digit(c,10) == digits[i]) {
                j++;
            }
            i++;
        }

        

        if (j == 3) {

            System.out.println("Correct!");

            isLocked = false;

        } else if (j != 3) {

            System.out.println("Wrong! Try again.");

        }

    }

    

    /**

    * Checks to see if is locked or not.

    */

    public boolean isLocked()

    {

        return isLocked;

    }

}