winInColumn方法应该可以工作但不能。为什么?

时间:2013-03-30 17:58:34

标签: java for-loop bluej

我有这个方法用于连接4游戏,这样你就可以赢得一个专栏。但是我得到一个超出范围的索引数组-1。它经过的数组大小为8x8(private int [] [] values = new int [8] [8];)。

我哪里出错?

public int winInAColumn(){
    int sum; //set sum as an integer
    for(int j=0;j<8;j++){ //loop through the rows
        for(int i=4;i>-1;i--){ //loop through columns. I must equal 4 as there must be three disks next to  
            sum = 0; //set sum to 0
            for(int k=i;k>i-4;k--){ //loop backwards through k while k is bigger than i minus 4
                sum+=values[k][j]; //sum + sum = the value in  i and j
            }
            if(Math.abs(sum)==4){
                if(sum/4 == 1){
                    if(JOptionPane.showConfirmDialog(null, "Blue Has Won", "Game over", JOptionPane.OK_CANCEL_OPTION) == 0){
                        //
                    }
                    else 
                    {
                        System.exit(0);
                    } 
                }

                else if (sum/4 == -1){
                    if(JOptionPane.showConfirmDialog(null, "Blue Has Won", "Game over", JOptionPane.OK_CANCEL_OPTION) == 0)
                    {
                        //
                    }
                    else
                    {
                        System.exit(0);
                    } 
                }
            }
        }
    }
                return 0;
        //JOptionPane.showMessageDialog(null, "No one won this time.");
}

1 个答案:

答案 0 :(得分:0)

在第二个循环中,i从4向后移动,在第三个循环中,k从i向后移动到i-3,可以低至-3,因此是例外。

我并没有真正尝试详细了解您的算法,但可能会k>i-4替换k>i-4 && k>=0这样做诀窍......