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我正在尝试制作一个战舰游戏,为此我需要一个二维数组的正方形,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,会出现空指针异常。无法初始化Java中的对象的二维数组
战舰类:
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();
你有没有试过取消注释那些你不确定的行吗?你需要他们。 – Jeff
@Jeff是的,我仍然在“square [i] [j] .setContents(0);” line – ahota
@AJ你可以发布'Square'类的代码吗?它可能是由'setContents'方法本身产生的NPE。编辑:没关系,user1858654说得对。 – Jeff