第一次写博客，问大家一个问题吧。

import java.util.Scanner;

public class FIve {
public static void main(String[] args) {
new FIve().run();
}
public void run() {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入黑棋昵称");
String nameBlack = scanner.nextLine();
System.out.println("请输入白棋昵称");
String nameWhite = scanner.nextLine();

int size = 15;
int[][] table = new int[size][size];

printTable(table, size);

int win = 0;
int currentPlayer = 0;
do {
//  下棋
String playerName = currentPlayer == 0 ? nameBlack : nameWhite;
System.out.println("该" + playerName + "下棋");

int x, y;
boolean canPlace = true;
do{
if (!canPlace){
System.out.println("这个位置不能放棋子，请重新输入");
}
String code = scanner.nextLine();
y = code.charAt(0) - 'A';
x = Integer.valueOf(code.substring(1)) - 1;

canPlace = true;
canPlace = canPlace && x >= 0 && x < size;
canPlace = canPlace && y >= 0 && y < size;
canPlace = canPlace && table[y][x] == 0;
}while (!canPlace);

table[y][x] = currentPlayer == 0 ? 1 : 2;
currentPlayer++;
currentPlayer %= 2;
//  打印棋盘
printTable(table, size);
//  检测输赢
win = check(table, x, y );
} while (win == 0) ;

if (win == 1) {
System.out.println(nameBlack + "胜利");
} else if (win == 2) {
System.out.println(nameWhite + "胜利");
} else if (win == 3) {
System.out.println("平局");
}
}

public void printTable(int[][] table, int size) {
System.out.print("   ");
for (int i = 0; i < size; i++) {
int value = i + 1;
System.out.print(value < 10 ? value + "  " : value + " ");
}
System.out.println();

for (int i = 0; i < size; i++) {
char title = (char) ('A' + i);
System.out.print(title + "   ");
for (int j = 0; j < size; j++) {
int value = table[i][j];
char c = ' ';
switch (value) {
case 0: c = '.'; break;
case 1: c = 'x'; break;
case 2: c = 'o'; break;
}
System.out.print(c + "  ");
}
System.out.println();
}
}
public int check(int[][] table, int x, int y){
boolean test = false;
test = test || moreThaFive(table, x, y, 0, -1);
test = test || moreThaFive(table, x, y, 1, -1);
test = test || moreThaFive(table, x, y, 1, 0);
test = test || moreThaFive(table, x, y, 1, 1);

if (test){
return table[y][x];
}
return 0;
}

public boolean moreThaFive(int[][] table, int x, int y, int dx, int dy){
int count = 0;
count += count(table, x, y, dx, dy);
count += count(table, x, y, -dx, -dy);
count -= 1;
return count >= 5;
}

public int count(int[][] table, int originX, int originY, int dx, int dy){
int originValue = table[originY][originX];
int count = 0;
int x = originX;
int y = originY;

int value;
do {
count ++;
originX += dx;
originY += dy;
value = table[originY][originX];
} while (value == originValue);
return count;
}
}