Complete the ConnectFour.java methods using the skeleton code provided. This class should compile with ConnectFourCLI.java and ConnectFourTester.java, which are contained in the same package.

CONNECTFOUR.JAVA:

package cs$1302.$game;

import cs$1302.$gameutil.GamePhase;

import cs$1302.$gameutil.Token;

import cs$1302.$gameutil.TokenGrid;

$/**$

$*\{$@code ConnectFour$\}$ represents a two$-$player connection game involving a two$-$dimensional grid of

$*\{$@linkplain cs$1302.$gameutil.Token tokens$\}.$ When a $\{$@code ConnectFour$\}$ game object is

$*$ constructed, several instance variables representing the game's state are initialized and

$*$ subsequently accessible, either directly or indirectly, via "getter" methods. Over time, the

$*$ values assigned to these instance variables should change so that they always reflect the

$*$ latest information about the state of the game. Most of these changes are described in the

$*$ project's

$*$ functional requirements.

$*/$

public class ConnectFour $\{$

$//----------------------------------------------------------------------------------------------$

$//$ INSTANCE VARIABLES: You should NOT modify the instance variable declarations below.

$//$ You should also NOT add any additional instance variables. Static variables should

$//$ also NOT be added.

$//----------------------------------------------------------------------------------------------$

private int rows; $//$ number of grid rows

private int cols; $//$ number of grid columns

private Token$[][]$ grid; $//2$D array of tokens in the grid

private Token$[]$ player; $//1$D array of player tokens $($length $2)$

private int numDropped; $//$ number of tokens dropped so far

private int lastDropRow; $//$ row index of the most recent drop

private int lastDropCol; $//$ column index of the most recent drop

private GamePhase phase; $//$ current game phase

$//----------------------------------------------------------------------------------------------$

$//$ CONSTRUCTOR

$//----------------------------------------------------------------------------------------------$

$/**$

$*$ Constructs a $\{$@link cs$1302.$game.ConnectFour$\}$ game with a grid that has $\{$@code rows$\}-$many

$*$ rows and $\{$@code cols$\}-$many columns. All of the game's instance variables are expected to

$*$ be initialized by this constructor as described in the project's

$*$ functional

$*$ requirements.

$*$

$*$ @param rows the number of grid rows

$*$ @param cols the number of grid columns

$*$ @throws IllegalArgumentException if the value supplied for $\{$@code rows$\}$ or $\{$@code cols$\}$ is

$*$ not supported. The following values are supported: $\{$@code $6<=$ rows $<=9\}$ and

$*\{$@code $7<=$ cols $<=9\}.$

$*/$

public ConnectFour$($int rows, int cols$)\{$

if $($rows $<6||$ rows $>9||$ cols $<7||$ cols $>9)\{$

throw new IllegalArgumentException$("$Unsupported grid size."$)$;

$\}$

this.rows $=$ rows;

this.cols $=$ cols;

this.grid $=$ new Token$[$rows$][$cols$]$;

this.player $=$ new Token$[]\{$Token$.$PLAYER$\_$ONE, Token PLAYER$\_$TWO$\}$;

this.numDropped $=0$;

this.lastDropRow $=-1$;

this.lastDropCol $=-1$;

this.phase $=$ GamePhase.IN$\_$PROGRESS;

$\}//$ ConnectFour

$//----------------------------------------------------------------------------------------------$

$//$ INSTANCE METHODS

$//----------------------------------------------------------------------------------------------$

$/**$

$*$ Return the number of rows in the game's grid.

$*$

$*$ @return the number of rows

$*/$

public int getRows$()\{$

return rows;

$\}//$ getRows

$/**$

$*$ Return the number of columns in the game's grid.

$*$

$*$ @return the number of columns

$*/$

public int getCols$()\{$

return cols;

$\}//$ getCols

$/**$

$*$ Return whether $\{$@code row$\}$ and $\{$@code col$\}$ specify a location inside this game's grid.

$*$

$*$ @param row the position's row index

$*$ @param col the positions's column index

$*$ @return $\{$@code true$\}$ if $\{$@code row$\}$ and $\{$@code col$\}$ specify a location inside this game's

$*$ grid and $\{$@code false$\}$ otherwise

$*/$

public boolean isInBounds$($int row, int col$)\{$

return row $>=0$ && row $<$ rows && col $>=0$ && col $<$ cols;

$\}//$ isInBounds

$/**$

$*$ Return the grid $\{$@linkplain cs$1302.$gameutil.Token token$\}$ located at the specified position

$*$ or $\{$@code null$\}$ if no token has been dropped into that position.

$*$

$*$ @param row the token's row index

$*$ @param col the token's column index

$*$ @return the grid token located in row $\{$@code row$\}$ and column $\{$@code col$\},$ if it exists;

$*$ otherwise, the value $\{$@code null$\}$

$*$ @throws IndexOutOfBoundsExcepti