将9个石子放在9x9的方格中，要求同行、同列、45度上无两个石子。

public class Nine {
 public static int create08() {
   int l = (int) (Math.random() * 10) - 1;
   if (l < 0)
    l = 0;
   return l;
  } public static void main(String args[]) {
  int[][] map = new int[9][9];
   for (int i = 0; i < 9; i++)
    for (int j = 0; j < 9; j++)
     map[i][j] = 0;  for (int k = 0; k < 9; k++) {//测试的时候用小一些的值
   int l = create08();
    while (1 == map[k][l]) {
     l = create08();
    }
    map[k][l] = 2;   for (int i = 1; i < 9; i++) {
     if (l + i < 9)
      map[k][l + i] = 1;
     if (l - i >= 0)
      map[k][l - i] = 1;
     if (l + i < 9 && k + i < 9)
      map[k + i][l + i] = 1;
     if (l - i >= 0 && k + i < 9)
      map[k + i][l - i] = 1;
     if (k + i < 9)
      map[k + i][l] = 1;
    }  }
  for (int i = 0; i < 9; i++) {
    System.out.println();
    for (int j = 0; j < 9; j++) {
     System.out.print(map[i][j] + " ");
    }
   } }
}