Mine

import java.util.*;
public class c4 {

static final int ROWS = 7;
static final int COLS = 8;
static String grid[][] = new String[ROWS][COLS];
static String[] piece = {"_", "@", "#"};
static int player, turn, row, col;
static boolean done;

public static void main(String[] args) {
init();
Scanner keybd = new Scanner(System.in);
do{
	do{
	System.out.print("\nSelect a column [1 - 7], Player "+player+": ");
	col = keybd.nextInt();
	}while(col < 1 || col > 7 || grid[1][col] == "@" || grid[1][col] == "#");

	for(int r = 6; r >= 1; r--) {
		if(grid[r][col] == "_") {
			grid[r][col] = piece[player];
			break;
		}
	}
	
	display();	
	done = ftw();
	if (done)
		break;
	else if(player == 1)
		player = 2;
	else if (player == 2)
		player = 1;
		
}while(!done);
}

public static void init() {
done = false;
player = 1;
turn = 0;
   for(int r = 1; r < ROWS; r++) {
     for(int c = 1; c < COLS; c++) {
      grid[r][c] = piece[0];
     }
   }
}

public static void display() {
	for(int r = 1; r < ROWS; r++) {
		System.out.println();
	    for(int c = 1; c < COLS; c++) {
			System.out.print("|"+grid[r][c]+"|");
	    }
	    System.out.println();
   	}
}

public static boolean ftw() {
//horizontal win
for(int r = 6; r >= 1; r--) {
	for(int c = 1; c <= 4; c++) {
		if(grid[r][c] == grid[r][c+1] &&
			grid[r][c+1] == grid[r][c+2] &&
			grid[r][c+2] == grid[r][c+3] &&
			grid[r][c] != "_") {
				System.out.println("Player "+player+" has wone the game!");
				return true;
		}
	}
}
//vertical win
for(int r = 6; r >= 1; r--) {
	for(int c = 1; c <= 4; c++) {
		if(grid[r][c] == grid[r-1][c] &&
			grid[r-1][c] == grid[r-2][c] &&
			grid[r-2][c] == grid[r-3][c] &&
			grid[r][c] != "_") {
				System.out.println("Player "+player+" has wone the game!");
				return true;
		}
	}
}
//diagonal win [left-to-right]
for(int r = 6; r >= 1; r--) {
	for(int c = 1; c <= 4; c++) {
		if(grid[r][c] == grid[r-1][c+1] &&
			grid[r-1][c+1] == grid[r-2][c+2] &&
			grid[r-2][c+2] == grid[r-3][c+3] &&
			grid[r][c] != "_") {
				System.out.println("Player "+player+" has wone the game!");
				return true;
		}
	}
}
//diagonal win [right-to-left]
/*
for(int r = 1; r <= 6; r++) {
	for(int c = 1; c <= 4; c++) {
		if(grid[r][c] == grid[r+1][c+1] &&
			grid[r+1][c+1] == grid[r+2][c+2] &&
			grid[r+2][c+2] == grid[r+3][c+3] &&
			grid[r][c] != "_") {
				System.out.println("Player "+player+" has wone the game!");
				return true;
		}
	}
}
*/
return false;
}
}