I need help in my Connect Four program. Specifically in placing the user's input on the gameboard & also checking horizonallty, vertically, etc.

/*
 * ConnectFour program
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;        
import java.util.Scanner;

public class ConnectFour implements ActionListener 
{
  JFrame frame;
  JPanel contentPane;
  JButton displayMessage;
  
  public ConnectFour()
  {
    /* Create and set up the frame */
    frame = new JFrame("Connect Four");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    /* Create a content pane with a BoxLayout and empty borders */
    contentPane = new JPanel();
    contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
    contentPane.setBackground(Color.white);
    contentPane.setLayout(new GridLayout(0, 2, 5, 10));
    
    /* Create a button */
    displayMessage = new JButton("Play Now!");
    displayMessage.setBackground(Color.yellow);
    displayMessage.setForeground(Color.blue);
    displayMessage.addActionListener(this);
    contentPane.add(displayMessage);
    
    /* Add content pane to frame */
    frame.setContentPane(contentPane);
    
    /* Size and then display the frame. */
    frame.pack();
    frame.setVisible(true);
  }
  
  /**
   * Handle a the button click
   * pre: none
   * post: A message has been displayed.
   */
  public void actionPerformed(ActionEvent event) 
  {    
    Scanner input = new Scanner(System.in);
    String player1;
    String player2;
    int choice;
    int currentPlayer;
    int player1Turn = 1;
    int player2Turn = 2;
    
    int draw = 0;
    int win = 0;
    int count =0;
    
    //Columns
    int col1 = 12;
    int col2 = 13;
    int col3 = 14;
    int col4 = 15;
    
    //Prompt Player for Name
    System.out.print("Player one, enter your name:");
    player1 = input.nextLine();
    player1 = player1.toUpperCase();
    
    System.out.print("Player two, enter your name:");
    player2 = input.nextLine();
    player2 = player2.toUpperCase();
    
    //Assign Players a Color (Black or Red)
    System.out.println(player1 + "  " + "you are BLACK." + "  " +  player2 + "  " +"you are RED");
    System.out.println("");
    
    do
    {
      //Display Grid
      String [] grid = new String [16];
      System.out.println("1 2 3 4");
      for (int i = 0; i<grid.length; i++)
      {
        grid[i]="*";
      }
      for (int i = 0; i <grid.length; i++)
      {
        
        System.out.print (grid[i]+ " ");
        
        
        if(i%4 == 3)
          
        {
          System.out.println (" ");
        }
      }
      
      //Ask user what spot they want to play their chip
      System.out.println(player1 + " , which column do you want to place your chip in?");
      choice = input.nextInt();
      
      
      
      //Check if spot is free on board
      if (grid[choice].equals ("B") || grid[choice].equals("R"))
      {
        System.out.println("This spot is already taken. Try again!");
        choice = input.nextInt();
      }
      
      else
      {
        grid[choice] ="B";
      }
      
      //Counter 
      count = count + 1;
      
      // Check whose turn
      if (player1Turn ==1)
      {
        System.out.println ("B"); player2Turn=2; 
        
      }
      else 
      {
        System.out.println ("R"); player1Turn=1;
      }
      
      
      //Check if tie game
      if (count == 16)
      {
        System.out.print("Tie Game.");
        draw = 1;
      }
    }while (draw==0 && win==0);
    
  }
  
  
  /**
   * Create and show the GUI.
   */
  private static void runGUI() 
  {
    JFrame.setDefaultLookAndFeelDecorated(true);
    
    ConnectFour myApplication = new ConnectFour();
  }
  
  public static void main(String[] args) 
  {
    /* Methods that create and show a GUI should be 
     run from an event-dispatching thread 
     */
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        runGUI();
      }
    });
  }
}

I need help in my Connect Four program. Specifically in placing the user's input on the gameboard & also checking horizonallty, vertically, etc.

can you be a bit more specific?

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