我正在尝试制作一款战舰游戏,为此我需要一个二维正方形阵列,这是一个人可以选择的地方。但是,当我运行我的程序时,当我尝试调用 resetBoard() 函数时出现空指针异常。
战舰等级:
public class Battleship
{
private Square[][] squares;
private boolean aircraftCarrierSunk;
private boolean battleshipSunk;
private boolean submarineSunk;
private boolean patrolBoatSunk;
private int boardSize;
public int turns;
public Battleship(int x)
{
squares = new Square[x][x];
// for(int i = 0; i < boardSize; i++) //not sure if I need this
// {
// for(int j = 0; j < boardSize; j++)
// {
// squares[i][j] = new Square();
// }
// }
boardSize = x;
aircraftCarrierSunk = false;
battleshipSunk = false;
submarineSunk = false;
patrolBoatSunk = false;
}
public void resetBoard()
{
for(int i = 0; i < boardSize; i++)
{
for(int j = 0; j < boardSize; j++)
{
squares[i][j].setContents(0);
}
}
}
司机:
public static void main (String [] args)
{
Battleship game = new Battleship(5); // play on a 5 by 5 board
System.out.println("Battleship!");
System.out.println("-----------\n");
for (int gameNumber = 1; gameNumber <= 2; gameNumber++)
{
game.resetBoard();
最佳答案
知道了 - 取消注释 Battleship
中的行,然后将 boardSize = x;
移动到 for 循环之上。
关于java - 无法在 Java 中初始化二维对象数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13617066/