Need help implementing this Java code

Below is the skeleton of the code

package hw3;

import api.Cell; import api.Flow;

/** * Game state for a Flow Free game. */ public class FlowGame { private int height;

private int width;

privite Cell currentCell;

//instnace variable to track an array of flow objects /** * Constructs a FlowGame to use the given array of Flows and * the given width and height. Client is responsible for ensuring that all * cells in the given flows have row and column values within * the given width and height. * @param givenFlows * an array of Flow objects * @param givenWidth * width to use for the game * @param givenHeight * height to use for the game */ public FlowGame(Flow[] givenFlows, int givenWidth, int givenHeight) { // TODO } /** * Constructs a FlowGame from the given descriptor. * @param descriptor * array of strings representing initial endpoint positions */ public FlowGame(String[] descriptor) { // TODO } /** * Returns the width for this game. * @return * width for this game */ public int getWidth() { // TODO return 0; } /** * Returns the height for this game. * @return * height for this game */ public int getHeight() { // TODO return 0; } /** * Returns the current cell for this game, possible null. * @return * current cell for this game */ public Cell getCurrent() { // TODO return null; } /** * Returns all flows for this game. Client should not modify * the returned array or lists. * @return * array of flows for this game */ public Flow[] getAllFlows() { // TODO return null; } /** * Returns the number of occupied cells in all flows (including endpoints). * @return * occupied cells in this game */ public int getCount() { // TODO return 0; } /** * Returns true if all flows are complete and all cells are occupied. * @return * true if all flows are complete and all cells are occupied */ public boolean isComplete() { // TODO return false; } /** * Attempts to set the "current" cell to be an existing cell at the given * row and column. When using a GUI, this method is typically * invoked when the mouse is pressed. *

*

Any endpoint can be selected as the current cell. Selecting an * endpoint clears the flow associated with that endpoint. *

A non-endpoint cell can be selected as the current cell only if * it is the last cell in a flow. *

* If neither of the above conditions is met, this method does nothing. * * @param row * given row * @param col * given column */ public void startFlow(int row, int col) { // TODO } /** * Clears the "current" cell. That is, directly after invoking this method, * getCurrent returns null. When using a GUI, this method is * typically invoked when the mouse is released. */ public void endFlow() { // TODO } /** * Attempts to add a new cell to the flow containing the current cell. * When using a GUI, this method is typically invoked when the mouse is * dragged. In order to add a cell, the following conditions must be satisfied: *

*

The current cell is non-null *

The given position is horizontally or vertically adjacent to the * current cell *

The given position either is not occupied OR it is occupied by * an endpoint for the flow that is not already in the flow * * If the three conditions are met, a new cell with the given row/column * and correct color is added to the current flow, and the current cell * is updated to be the new cell. * * @param row * given row for the new cell * @param col * given column for the new cell */ public void addCell(int row, int col) { // TODO } /** * Returns true if the given position is occupied by a cell in a flow in * this game (possibly an endpoint). * @param row * given row * @param col * given column * @return * true if any cell in this game has the given row and column, false otherwise */ public boolean isOccupied(int row, int col) { // TODO return false; }

}