// 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"); } }

The interface to be implemented

Do Not change anything in the interface

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 */ public DynArr310 add(String value); }

Please follow the instructions in the comments and implement the MyAbacus class in java today. Thank you