Using the Abacus class, complete the MyAbacus class Abacus Class

**

* Interface for an abacus for the AbacusGUI to use.

*/

public interface Abacus {

/**

* Gets the number base of the abacus. This base

* will never be an odd number and never be less

* than 2.

*

* @return the number base of the abacus

*/

public int getBase();

/**

* Returns the number of places (bead columns) the

* abacus is using to represent the number. This

* will never be less than one.

*

* @return the number of places in use

*/

public int getNumPlaces();

/**

* Gets the number of beads in the top area of the

* abacus which are in-use for a given place. (The

* number of beads in the top which are pushed down

* to the center.)

*

* @param place the beads column of interest (0 is the right-most place)

* @return the number of beads currently in use

* @throws IndexOutOfBoundsException if the place requested is not in use

*/

public int getBeadsTop(int place);

/**

* Gets the number of beads in the bottom area of the

* abacus which are in-use for a given place. (The

* number of beads in the bottom which are pushed up

* to the center.)

*

* @param place the beads column of interest (0 is the right-most place)

* @return the number of beads currently in use

* @throws IndexOutOfBoundsException if the place requested is not in use

*/

public int getBeadsBottom(int place);

/**

* Adds the given string representation of a number to

* the current value of the abacus. The abacus is updated

* to this new position. It returns the steps to perform

* the add (snap shots of the abacus at each step). The

* abacus may be left in an "improper state" if the

* provided arguements are invalid.

*

*

A snapshot is required for each of the following steps:

*

*

• - the initial state

  *

• - the final state

  *

• - expansions (beads should not be moved, the abacus just

  * becomes bigger/smaller)

  *

• - exchanges (beads are exchanged in one step)

  *

• - movement of X beads up OR down (not both at the same time)

  * in ONE place on the bottom OR top of the abacus (not both

  * at the same time)

  *

*

* @param value the string representation of the value to add (e.g. "100" in base 10, or "1f" in base 16)

* @return the different positions the abacus was in (including the start and finish states)

* @throws NumberFormatException if string is not correct for the base

*/

MyAbacus Class

// TO DO: add your implementation and JavaDocs

public class MyAbacus implements Abacus {

// ADD MORE PRIVATE MEMBERS HERE IF NEEDED! // Remember: Using an array in this class = no credit on the project! public MyAbacus(int base) { // throws IllegalArgumentException if base is invalid // remember: an abacus should always have at least one // column! } public int getBase() { // O(1) return -1; //default return, make sure to remove/change }

public int getNumPlaces() { // O(1) return -1; //default return, make sure to remove/change } public int getBeadsTop(int place) { // O(1) return -1; //default return, make sure to remove/change } public int getBeadsBottom(int place) { // O(1) return -1; //default return, make sure to remove/change } public boolean equals(MyAbacus m) { // O(N) where N is the number of places currently // in use by the abacus return false; //default return, make sure to remove/change } public DynArr310 add(String value) { // Hints: // see: https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html#parseInt-java.lang.String-int- // and: https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#charAt-int- // Also... I personally found a recursive helper function really, really useful here... // Important: each Abacus in the DynArr310 returned should // be a copy of this abacus. If you just add this abacus over and over // you'll just get the final abacus shown multiple times in the GUI.

return null; //default return, make sure to remove/change } // -------------------------------------------------------- // example testing code... edit this as much as you want! // -------------------------------------------------------- public static void main(String[] args) { //this is the sequence from the project description Abacus a = new MyAbacus(10); DynArr310 steps; AbacusGUI.printAbacus(a); AbacusGUI.fullPrintAdd(a, "36"); AbacusGUI.fullPrintAdd(a, "12"); AbacusGUI.fullPrintAdd(a, "2"); AbacusGUI.fullPrintAdd(a, "12"); AbacusGUI.fullPrintAdd(a, "10"); AbacusGUI.fullPrintAdd(a, "2"); AbacusGUI.fullPrintAdd(a, "68"); AbacusGUI.fullPrintAdd(a, "50"); AbacusGUI.fullPrintAdd(a, "10"); AbacusGUI.fullPrintAdd(a, "5"); AbacusGUI.fullPrintAdd(a, "3"); AbacusGUI.fullPrintAdd(a, "128"); AbacusGUI.fullPrintAdd(a, "3000000");